{"id":9707,"date":"2020-12-01T01:05:31","date_gmt":"2020-11-30T17:05:31","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=9707"},"modified":"2026-04-03T17:08:02","modified_gmt":"2026-04-03T09:08:02","slug":"js-intersectionobserver-nav","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2020\/12\/js-intersectionobserver-nav\/","title":{"rendered":"\u5c1d\u8bd5\u4f7f\u7528JS IntersectionObserver\u8ba9\u6807\u9898\u548c\u5bfc\u822a\u8054\u52a8"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=9707\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=9707<\/a><br \/>\n\u672c\u6587\u6b22\u8fce\u5206\u4eab\u4e0e\u805a\u5408\uff0c\u5168\u6587\u8f6c\u8f7d\u5c31\u4e0d\u5fc5\u4e86\uff0c\u5c0a\u91cd\u7248\u6743\uff0c\u5708\u5b50\u5c31\u8fd9\u4e48\u5927\uff0c\u82e5\u6025\u7528\u53ef\u4ee5\u8054\u7cfb\u6388\u6743\u3002<\/p>\n<p><script>window.wxShareImgUrl = 'https:\/\/www.zhangxinxu.com\/study\/image\/share\/202011-intersection-observer.png';<\/script><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202012\/intersection-observer-cover.png\" width=\"480\" height=\"306\" alt=\"\u5357\u74dc\u5c01\u9762\u56fe\" class=\"alignright clip thumb size-medium\" \/><\/p>\n<p>\u7a81\u7136\u6709\u4e86\u65b0\u7684\u60f3\u6cd5\u600e\u4e48\u529e\uff1f<\/p>\n<p>\u7a97\u5916\u9633\u5149\u660e\u5a9a\uff0c\u4e0b\u4e86\u4e00\u4e2a\u661f\u671f\u7684\u96e8\uff0c\u7ec8\u4e8e\u653e\u6674\u4e86\uff0c\u6240\u4ee5\uff0c\u5f88\u663e\u7136\uff0c\u4ee3\u7801\u64b8\u8d77\u6765\uff0c\u624d\u5bf9\u5f97\u8d77\u8fd9\u4e2a\u5468\u672b\uff0c\u563f\u563f\u563f\u3002<\/p>\n<p><strong>\u66f4\u65b0\u4e8e2026\u5e744\u67083\u65e5<\/strong><\/p>\n<p>\u65f6\u4ee3\u53d8\u5316\uff0c\u83dc\u5355\u548c\u6807\u9898\u8054\u52a8\u9ad8\u4eae\u73b0\u5728\u7eafCSS\u5c31\u5df2\u7ecf\u652f\u6301\u4e86\uff0c\u8be6\u89c1\u6b64\u6587\uff1a\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2025\/09\/css-scroll-target-group\/\">CSS scroll-target-group\u52a0:target-current\u6eda\u52a8\u83dc\u5355\u81ea\u52a8\u9ad8\u4eae<\/a>\u201d<\/p>\n<p>\u4e0d\u8fc7CSS\u65b9\u6cd5\u73b0\u5728\u53ea\u6709Chrome\u6d4f\u89c8\u5668\u652f\u6301\uff0c\u5bf9\u4e8e\u5176\u4ed6\u6d4f\u89c8\u5668\uff0c\u53ef\u4ee5\u4f7f\u7528IntersectionObserver Polyfill\u4e00\u4e0b\u3002<\/p>\n<p>\u5c31DOM\u5b9e\u73b0\u800c\u8a00\uff0cIntersectionObserver\u786e\u5b9e\u662f\u6700\u597d\u7684\u5bfc\u822a\u9ad8\u4eae\u6280\u672f\u9009\u578b\uff0c\u4f46\u662f\uff0c\u5e76\u4e0d\u9700\u8981\u672c\u6587\u5b9e\u73b0\u7684\u8fd9\u822c\u9ebb\u70e6\u3002<\/p>\n<pre>\/\/ \u76ee\u5f55\u9ad8\u4eaepolyfill\r\nconst observer = new IntersectionObserver((entries) =&gt; {\r\n  entries.forEach(entry =&gt; {\r\n    if (entry.isIntersecting) {\r\n      const id = entry.target.getAttribute('id');\r\n      \/\/ \u6240\u6709\u83dc\u5355\u5143\u7d20\r\n      document.querySelectorAll('a').forEach(link =&gt; link.classList.remove('active'));\r\n      \/\/ \u5339\u914d\u9910\u5355\u5143\u7d20\r\n      document.querySelector(`a[href=\"#${id}\"]`).classList.add('active');\r\n    }\r\n  });\r\n}, { threshold: 0.5 });\r\n\r\n\/\/ \u89c2\u5bdf\u6807\u9898\u5143\u7d20\r\ndocument.querySelectorAll('h3').forEach(title =&gt; {\r\n  observer.observer(title);\r\n});<\/pre>\n<p>\u4e0a\u9762\u4ee3\u7801\u5c31\u8db3\u591f\u4e86\u3002<\/p>\n<h3>\u4e00\u3001\u5b9e\u73b0\u600e\u6837\u7684\u6548\u679c\uff1f<\/h3>\n<p>\u4e00\u822c\u6587\u6863\u9875\u9762\u90fd\u6bd4\u8f83\u957f\uff0c\u4e3a\u4e86\u65b9\u4fbf\u5b9a\u4f4d\uff0c\u90fd\u4f1a\u57fa\u4e8e\u6807\u9898\u751f\u6210\u4e00\u4e2a\u5bfc\u822a\u3002<\/p>\n<p>\u6bd4\u65b9\u8bf4\u6211\u7684\u535a\u5ba2\u6587\u7ae0\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202011\/2020-11-29_205159.png\" width=\"518\" height=\"286\" alt=\"\u5bfc\u822a\u622a\u56fe\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>Ant.design\u6216\u8005Vue.js\u7684\u6587\u6863\u9875\u5747\u6709\u7c7b\u4f3c\u7684\u529f\u80fd\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202011\/2020-11-29_210303.png\" width=\"348\" height=\"338\" alt=\"\u5bfc\u822a\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u4ee5\u524d\u6211\u5199\u8fc7\u4e00\u4e2ajQuery\u5c0f\u63d2\u4ef6\u5b9e\u73b0\u6b64\u529f\u80fd\uff0c\u8be6\u89c1\uff1a\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2018\/04\/jquery-plugin-document-article-title-nav-js\/\">jQuery\u5c0f\u63d2\u4ef6titleNav.js<\/a>\u201d\u3002<\/p>\n<p>\u540e\u6765\u4e5f\u5199\u8fc7\u539f\u751fJS\u5199\u8fc7\u6b64\u529f\u80fd\uff0cIE9+\u90fd\u652f\u6301\uff0c\u76d1\u542c\u6eda\u52a8\u4e8b\u4ef6\uff0c\u5224\u65ad\u6ca1\u6709\u6807\u9898\u5143\u7d20\u548c\u6eda\u52a8\u7a97\u4f53\u4f4d\u7f6e\uff0c\u8c01\u4f4d\u7f6e\u6700\u8fd1\u5c31\u54ea\u4e2a\u9ad8\u4eae\uff0c\u5c31\u662f\u672c\u535a\u5ba2\u76ee\u524d\u4f7f\u7528\u7684\u4ee3\u7801\uff0c\u6eda\u52a8\u7684\u65f6\u5019\u5b9e\u65f6\u8ba1\u7b97\u6bcf\u4e00\u4e2a\u6807\u9898\u5143\u7d20\u7684\u4f4d\u7f6e\uff0c\u4ee3\u7801\u5570\u55e6\uff0c\u6027\u80fd\u4e5f\u4e00\u822c\u822c\u3002<\/p>\n<p>\u4eca\u5929\u6211\u5728\u6574<a href=\"https:\/\/github.com\/zhangxinxu\/mobilebone\" rel=\"noopener\" target=\"_blank\">Mobilebone<\/a>\u65b0\u7684\u6587\u6863\uff0c\u53c8\u9700\u8981\u5b9e\u73b0\u7c7b\u4f3c\u7684\u4ea4\u4e92\u6548\u679c\u3002<\/p>\n<p>\u6211\u5c31\u7422\u78e8\u7740\uff0c\u6709\u6ca1\u6709\u66f4\u7b80\u5355\u7684\u5b9e\u73b0\u65b9\u6cd5\uff0c\u4e0d\u9700\u8981\u5b9e\u65f6\u8ba1\u7b97\uff0c\u5c31\u77e5\u9053\u8be5\u9ad8\u4eae\u54ea\u4e00\u4e2a\u5bfc\u822a\u5143\u7d20\u3002<\/p>\n<p>\u4e8e\u662f\u5c31\u5728\u8111\u4e2d\u904d\u5386\u81ea\u5df1\u7684\u77e5\u8bc6\u50a8\u5907\uff0c\u7136\u540e\u6709\u4e2aAPI\u6d6e\u51fa\u4e86\u6c34\u9762\uff0c\u8fd9\u4e2aAPI\u5c31\u662fIntersectionObserver\uff0c\u53ef\u4ee5\u89c2\u5bdf\u5143\u7d20\u548c\u7a97\u4f53\u7684\u4ea4\u53c9\u60c5\u51b5\u3002<\/p>\n<p>\u8c8c\u4f3c\u6709\u620f\u3002<\/p>\n<p><span class=\"hidden\">\/\/zxx: \u5982\u679c\u4f60\u770b\u5230\u8fd9\u6bb5\u6587\u5b57\uff0c\u8bf4\u660e\u4f60\u73b0\u5728\u8bbf\u95ee\u662f\u4f53\u9a8c\u7cdf\u7cd5\u7684\u5783\u573e\u76d7\u7248\u7f51\u7ad9\uff0c\u4f60\u53ef\u4ee5\u8bbf\u95ee\u539f\u6587\u83b7\u5f97\u5f88\u597d\u7684\u4f53\u9a8c\uff1ahttps:\/\/www.zhangxinxu.com\/wordpress\/?p=9707\uff08\u4f5c\u8005\u5f20\u946b\u65ed\uff09<\/span><\/p>\n<h3>\u4e8c\u3001IntersectionObserver\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>web\u9886\u57df\u6709\u5f88\u591a\u7684Observer\uff0c\u4fd7\u79f0\u89c2\u5bdf\u5668\uff0c\u5c31\u662f\u53ef\u4ee5\u5b9e\u65f6\u53cd\u9988\u7f51\u9875\u7684\u67d0\u4e9b\u4ea4\u4e92\u53d8\u5316\u3002<\/p>\n<p>\u4f8b\u5982Mutation Observer\uff0c\u53ef\u4ee5\u89c2\u5bdfDOM\u5143\u7d20\u7684\u589e\u5220\u4ee5\u53ca\u5c5e\u6027\u53d8\u5316\uff0c\u53ef\u53c2\u89c1\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2019\/08\/js-dom-mutation-observer\/\">\u804a\u804aJS DOM\u53d8\u5316\u7684\u76d1\u542c\u68c0\u6d4b\u4e0e\u5e94\u7528\u201d\u4e00\u6587<\/a>\uff1b\u53c8\u4f8b\u5982Resize Observer\uff0c\u53ef\u4ee5\u89c2\u5bdf\u5143\u7d20\u7684\u5c3a\u5bf8\u53d8\u5316\uff0c\u53ef\u53c2\u89c1\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2020\/03\/dom-resize-api-resizeobserver\/\">JS ResizeObserver API\u7b80\u4ecb<\/a>\u201d\u4e00\u6587\u3002<\/p>\n<p>\u8fd9\u91cc\u8981\u4ecb\u7ecd\u7684Intersection Observer\u662f\u89c2\u5bdf\u5143\u7d20\u548c\u7a97\u4f53\u76f8\u4ea4\u7684\u72b6\u6001\uff0c\u975e\u5e38\u9002\u5408\u7528\u5728\u4e0e\u6eda\u52a8\u76f8\u5173\u7684\u4ea4\u4e92\u4e8b\u4ef6\u4e2d\u3002<\/p>\n<p>\u4f8b\u5982\u56fe\u7247\u7684\u61d2\u52a0\u8f7d\u6548\u679c\uff0c\u6216\u8005\u662f\u65e0\u9650\u6eda\u52a8\u52a0\u8f7d\u6548\u679c\u7b49\uff0cV1\u7248\u672c\u89c4\u8303\u7684\u517c\u5bb9\u6027\u8fd8\u662f\u5f88\u4e0d\u9519\u7684\uff0c\u79fb\u52a8\u7aef\u51e0\u4e4e\u53ef\u4ee5\u653e\u5fc3\u4f7f\u7528\uff0c\u6069\u2026\u20262\u5e74\u4e4b\u540e\u51e0\u4e4e\u53ef\u4ee5\u653e\u5fc3\u4f7f\u7528\uff0ciOS\u7684\u517c\u5bb9\u6027\u7a0d\u7a0d\u6ede\u540e\u4e86\u4e00\u4e9b\uff0c\u5177\u4f53\u53c2\u89c1\u4e0b\u622a\u56fe\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202011\/2020-11-29_215835.png\" width=\"632\" height=\"284\" alt=\"Intersection Observer\u517c\u5bb9\u6027\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u4f7f\u7528\u5957\u8def\u5f88\u7b80\u5355\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre>var zxxObserver = new IntersectionObserver(function (entries) {\r\n    entries.forEach(function (entry) {\r\n        if (entry.isIntersecting) {\r\n            <span style=\"color:green;\">\/\/ entry.target\u5143\u7d20\u8fdb\u5165\u533a\u57df\u4e86<\/span>\r\n        }\r\n    });\r\n});\r\n<span style=\"color:green;\">\/\/ \u89c2\u5bdf\u5143\u7d201,2,...<\/span>\r\nzxxObserver.observe(ele1);\r\nzxxObserver.observe(ele2);\r\n...<\/pre>\n<p>\u7528\u6587\u5b57\u89e3\u91ca\u4e0b\u5c31\u662f\u8fd9\u4e24\u6b65\uff1a<\/p>\n<ol>\n<li>\u5b9a\u4e49\u5143\u7d20\u4ea4\u53c9\u540e\u5e72\u561b\u5e72\u561b\uff1b<\/li>\n<li>\u9700\u8981\u89c2\u5bdf\u90a3\u4e9b\u5143\u7d20\uff1b<\/li>\n<\/ol>\n<p>\u5b9e\u9645\u5f00\u53d1\u7684\u65f6\u5019\uff0c\u4e3b\u8981\u5de5\u4f5c\u5c31\u662f\u5bf9<code>entries.forEach<\/code>\u8fd9\u90e8\u5206\u7684\u4ee3\u7801\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<p>\u5176\u4e2d\uff0c<code>entry<\/code>\u5bf9\u8c61\u5305\u62ec\u4ee5\u4e0b\u8fd9\u4e9b\u53c2\u6570\uff1a<\/p>\n<dl>\n<dt><strong>entry.boundingClientRect<\/strong><\/dt>\n<dd>\u5f53\u524d\u89c2\u5bdf\u5143\u7d20\u7684\u77e9\u5f62\u533a\u57df\uff0ctop\/right\/bottom\/left\u5c5e\u6027\u53ef\u4ee5\u83b7\u5f97\u6b64\u65f6\u76f8\u5bf9\u89c6\u533a\u7684\u8ddd\u79bb\uff0cwidth\/height\u5c5e\u6027\u5305\u542b\u5c3a\u5bf8\u3002\u6b64\u5c5e\u6027\u548c<code>Element.getBoundingClientRect()<\/code>\u8fd9\u4e2aAPI\u65b9\u6cd5\u975e\u5e38\u7c7b\u4f3c\u3002<\/dd>\n<dt><strong>entry.intersectionRatio<\/strong><\/dt>\n<dd>\u5f53\u524d\u5143\u7d20\u88ab\u4ea4\u53c9\u7684\u6bd4\u4f8b\u3002\u6bd4\u4f8b\u8981\u60f3\u975e\u5e38\u8be6\u7ec6\uff0c\u9700\u8981<code>IntersectionObserver()<\/code>\u51fd\u6570\u7684\u7b2c2\u4e2a\u53ef\u9009\u53c2\u6570\u4e2d\u8bbe\u7f6e<code>thresholds<\/code>\u53c2\u6570\uff0c\u4e5f\u5c31\u662f\u8bbe\u7f6e\u89e6\u53d1\u4ea4\u53c9\u4e8b\u4ef6\u7684\u9608\u503c\u3002<\/dd>\n<dt><strong>entry.intersectionRect<\/strong><\/dt>\n<dd>\u548c\u89c6\u533a\u4ea4\u53c9\u7684\u77e9\u5f62\u5927\u5c0f\u3002<\/dd>\n<dt><strong>entry.isIntersecting<\/strong><\/dt>\n<dd>\u5982\u679c\u662ftrue\uff0c\u5219\u8868\u793a\u5143\u7d20\u4ece\u89c6\u533a\u5916\u8fdb\u5165\u89c6\u533a\u5185\u3002<\/dd>\n<dt><strong>entry.rootBounds<\/strong><\/dt>\n<dd>\u7a97\u4f53\u6839\u5143\u7d20\u7684\u77e9\u5f62\u533a\u57df\u5bf9\u8c61\u3002<\/dd>\n<dt><strong>entry.target<\/strong><\/dt>\n<dd>\u5f53\u524d\u4ea4\u53c9\u7684\u5143\u7d20\u3002<\/dd>\n<dt><strong>entry.time<\/strong><\/dt>\n<dd>\u5f53\u524d\u65f6\u95f4\u6233\u3002<\/dd>\n<\/dl>\n<p>\u5728\u672c\u4f8b\u4e2d\uff0c\u4e3b\u8981\u4f7f\u7528<code>entry.isIntersecting<\/code>\uff0c\u8868\u793a\u5f53\u524d\u5143\u7d20\u548c\u76ee\u6807\u533a\u57df\u4ea4\u53c9\u4e86\u3002<\/p>\n<h3>\u4e09\u3001\u5177\u4f53\u5b9e\u73b0\u8fc7\u7a0b\u8bb0\u5f55<\/h3>\n<p>\u5047\u8bbe\u6211\u4eec\u9700\u8981\u89c2\u5bdf\u7684\u6807\u9898\u5143\u7d20\u90fd\u662f<code>&lt;h3&gt;<\/code>\u5143\u7d20\uff0c\u5219\u4ee3\u7801\u53ef\u4ee5\u8fd9\u4e48\u5904\u7406\uff1a<\/p>\n<pre>var zxxObserver = new IntersectionObserver(function (entries) {\r\n    entries.forEach(function (entry) {\r\n        if (entry.isIntersecting) {\r\n            <span style=\"color:green;\">\/\/ active()\u662f\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7684\u9ad8\u4eae\u65b9\u6cd5<\/span>\r\n            entry.target.active();\r\n        }\r\n    });\r\n});\r\n<span style=\"color:green;\">\/\/ \u89c2\u5bdf\u6807\u9898\u5143\u7d20<\/span>\r\ndocument.querySelectorAll('h3').forEach(function (ele) {\r\n    zxxObserver.observe(ele);\r\n});<\/pre>\n<p>\u8fd9\u6837\uff0c\u6807\u9898\u5143\u7d20\u8fdb\u53bb\u89c6\u533a\u7684\u65f6\u5019\u5c31\u4f1a\u9ad8\u4eae\u3002<\/p>\n<p>\u4f46\u662f\u4e0a\u9762\u4ee3\u7801\u5b9e\u73b0\u7684\u6700\u7ec8\u6548\u679c\u6709\u4e9b\u8fdf\u949d\uff0c\u4f8b\u5982\u9875\u9762\u4e00\u5c4f\u4e2d\u540c\u65f6\u6709\u591a\u4e2a\u6807\u9898\u5143\u7d20\uff0c\u90a3\u4e48\u4e2d\u95f4\u7684\u6807\u9898\u5143\u7d20\u7684\u9ad8\u4eae\u5c31\u4f1a\u88ab\u8df3\u8fc7\uff08\u4e00\u6b21\u53ea\u80fd\u9ad8\u4eae\u4e00\u4e2a\u5143\u7d20\uff09\u3002<\/p>\n<p>\u6700\u597d\u662f\u6807\u9898\u5143\u7d20\u8fdb\u5165\u5c4f\u5e55\u4e2d\u95f4\u533a\u57df\u65f6\u5019\u624d\u89e6\u53d1\u4ea4\u53c9\u68c0\u6d4b\u3002<\/p>\n<p>\u6709\u529e\u6cd5\u7684\uff0c\u53ef\u4ee5\u4f7f\u7528<code>IntersectionObserver()<\/code>\u51fd\u6570\u7684\u7b2c2\u4e2a\u53ef\u9009\u53c2\u6570\u5b9e\u73b0\u3002<\/p>\n<pre>new IntersectionObserver(callback, option);<\/pre>\n<p>\u4e5f\u5c31\u662f\u8fd9\u91cc\u7684<code>option<\/code>\u53ef\u9009\u53c2\u6570\u3002<\/p>\n<p>\u652f\u6301\u4e0b\u9762\u8fd9\u4e9b\u5c5e\u6027\u503c\uff1a<\/p>\n<dl>\n<dt><strong>root<\/strong><\/dt>\n<dd>\u7528\u6765\u4ea4\u53c9\u68c0\u6d4b\u7684\u6839\u5143\u7d20\uff0c\u9ed8\u8ba4\u662f\u6d4f\u89c8\u5668\u7a97\u4f53\u5143\u7d20\u3002<\/dd>\n<dt><strong>rootMargin<\/strong><\/dt>\n<dd>\u68c0\u6d4b\u533a\u57df\u7684\u504f\u79fb\u3002\u652f\u63011-4\u4e2a\u503c\uff0c\u548cmargin\u5c5e\u6027\u8868\u793a\u7684\u65b9\u4f4d\u542b\u4e49\u662f\u4e00\u6a21\u4e00\u6837\u7684\u3002\u4f46\u662f\u6b63\u8d1f\u503c\u7684\u542b\u4e49\u5374\u662f\u4e0d\u540c\u7684\uff0c\u6211\u4eca\u5929\u5c31\u88ab\u8fd9\u4e00\u70b9\u7ed9\u5751\u4e86\u3002\u4f8b\u5982\u4e00\u4e2a\u5143\u7d20\u8bbe\u7f6e<code>margin:100px<\/code>\uff0c\u5176\u81ea\u8eab\u533a\u57df\u5927\u5c0f\u53ea\u4f1a\u5c0f100px\uff0c\u4f46\u662f<code>rootMargin<\/code>\u53c2\u6570\u5374\u4e0d\u540c\uff0c\u6b63\u6570\u503c\u662f\u589e\u5927\u89c6\u533a\u7684\u68c0\u6d4b\u533a\u57df\uff0c\u8d1f\u503c\u53cd\u800c\u662f\u51cf\u5c0f\u3002<\/dd>\n<dt><strong>thresholds<\/strong><\/dt>\n<dd>\u89e6\u53d1<code>callback<\/code>\u51fd\u6570\u6267\u884c\u7684\u9608\u503c\uff0c\u662f\u4e2a\u6570\u7ec4\uff0c\u4f8b\u5982<code>[0.00, 0.01, 0.02, ..., 0.99, 1.00]<\/code>\uff0c\u5219\u4ea4\u53c9\u9762\u79ef\u4ece1%\u90fd100%\u90fd\u4f1a\u89e6\u53d1<code>callback<\/code>\uff0c\u9ed8\u8ba4\u53ea\u4f1a\u5728100%\u7684\u65f6\u5019\u89e6\u53d1\u4e00\u6b21\u3002\u6b64\u53c2\u6570\u652f\u6301function\u7c7b\u578b\uff0c\u8fd4\u56de\u5bf9\u5e94\u7684\u6570\u7ec4\u5373\u53ef\u3002<\/dd>\n<\/dl>\n<p>\u56de\u5230\u672c\u6587\u6848\u4f8b\uff0c\u56e0\u6b64\uff0c\u5982\u679c\u5e0c\u671b\u4ea4\u53c9\u68c0\u6d4b\u533a\u57df\u5c31\u662f\u6d4f\u89c8\u5668\u7a97\u4f53\u4e2d\u95f4\u8fd9\u90e8\u5206\uff0c\u53ef\u4ee5\u4f7f\u7528<code>rootMargin<\/code>\u53c2\u6570\uff0c\u76f8\u5173\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>var zxxObserver = new IntersectionObserver(function (entries) {\r\n    entries.forEach(function (entry) {\r\n        if (entry.isIntersecting) {\r\n            entry.target.active();\r\n        }\r\n    });\r\n}, {\r\n    <span style=\"color:#cd0000;\">rootMargin: '-33% 0% -33% 0%'<\/span>\r\n});<\/pre>\n<p>\u5662\u8036\uff0c\u8d76\u5februn\u4e00\u4e0b\uff0c\u770b\u770b\u5b9e\u73b0\u7684\u6548\u679c\u3002<\/p>\n<p>\u7ed3\u679c\u5475\u5475\u54d2\uff0c\u53d1\u73b0\u7b2c1\u4e2a\u5bfc\u822a\u5143\u7d20\u65e0\u6cd5\u9ad8\u4eae\uff0c\u56e0\u4e3a\u4e0a\u65b9\u5df2\u7ecf\u6ca1\u6709\u8db3\u591f\u7684\u7a7a\u95f4\u8ba9\u7b2c1\u4e2a\u6807\u9898\u5143\u7d20\u8fdb\u5165\u9875\u9762\u4e2d\u95f41\/3\u533a\u57df\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202011\/2020-11-30_222304.png\" width=\"523\" height=\"253\" alt=\"\u9ed8\u8ba4\u7b2c1\u9879\u65e0\u6cd5\u9ad8\u4eae\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u5e95\u90e8\u6700\u540e1\u4e2a\u5bfc\u822a\u5143\u7d20\u4e5f\u4f1a\u9047\u5230\u7c7b\u4f3c\u7684\u95ee\u9898\u3002<img decoding=\"async\" src=\"\/\/mat1.gtimg.com\/www\/mb\/images\/face\/36.gif\" align=\"absmiddle\"><\/p>\n<hr>\n<p>\u6211\u6574\u4e2a\u4eba\u5c31\u4e0d\u597d\u4e86\uff0c\u7422\u78e8\u7740\u6709\u6ca1\u6709\u4ec0\u4e48\u529e\u6cd5\u68c0\u6d4b\u5230\u9996\u4e2a\u5143\u7d20\u548c\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u4f4d\u7f6e\uff0c\u7136\u540e\u4e13\u95e8\u5904\u7406\u4e0b\uff0c\u4e00\u756a\u8111\u7ec6\u80de\u6d88\u8017\uff0c\u53d1\u73b0\u4e0d\u884c\uff0c\u901a\u8fc7\u5185\u7f6e\u67d0\u4e9b\u9690\u85cf\u5143\u7d20\u6269\u5927\u6807\u9898\u5143\u7d20\u9762\u79ef\u7684\u505a\u6cd5\u4e0d\u5177\u6709\u53ef\u590d\u5236\u6027\u3002<\/p>\n<p>\u6216\u8005\u6eda\u52a8\u5bb9\u5668\u5185\u521b\u5efa\u4e00\u4e2a\u7b49\u9ad8\u76840\u5bbd\u5143\u7d20\uff0c\u914d\u5408thresholds\u53c2\u6570\uff0c\u8fd9\u6837\u53ef\u4ee5\u5b9e\u65f6\u611f\u77e5\u6eda\u52a8\u884c\u4e3a\u7684\u53d1\u751f\uff0c\u4e8e\u662f\u5c31\u6709\u80fd\u529b\u8fdb\u884c\u975e\u5e38\u7ec6\u81f4\u7684\u5904\u7406\uff0c\u4f46\u662f\u8fd9\u6837\u505a\u672c\u8d28\u4e0a\u5c31\u548c\u6eda\u52a8\u4e8b\u4ef6\u6ca1\u4ec0\u4e48\u533a\u522b\u4e86\u3002<\/p>\n<p>\u5fc3\u6709\u4e0d\u7518\uff0c\u4e0d\u60f3\u4f7f\u7528scroll\u4e8b\u4ef6\uff0c\u6700\u540e\u2026\u2026\u8fd8\u662f\u59a5\u534f\u4f7f\u7528\u4e86scroll\u4e8b\u4ef6\u5b9e\u73b0\u4e86\u90e8\u5206\u529f\u80fd\uff0c\u548c\u4f20\u7edf\u7684\u6eda\u52a8\u4ea4\u4e92\u5b9e\u73b0\u4e00\u6837\uff0c\u8ba9\u5bb9\u5668\u6eda\u52a8\u5230\u9876\u90e8\u4e00\u5b9a\u662f\u7b2c1\u4e2a\u5143\u7d20\u9ad8\u4eae\uff0c\u6eda\u52a8\u5230\u5e95\u90e8\uff0c\u4e00\u5b9a\u662f\u6700\u540e1\u4e2a\u5143\u7d20\u9ad8\u4eae\uff0c\u76f8\u5173\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>window.addEventListener('scroll', function () {\r\n    var root = document.scrollingElement;\r\n    if (root.scrollTop == 0) {\r\n        elements[0].active();\r\n    } else if (root.scrollTop + root.clientHeight &gt; root.scrollHeight - 1) {\r\n        elements[elements.length - 1].active();\r\n    }\r\n});<\/pre>\n<p>\u7136\u800c\uff0c\u4e8b\u60c5\u5e76\u6ca1\u6709\u60f3\u7684\u90a3\u4e48\u987a\u5229\uff0c\u867d\u7136\u6eda\u52a8\u7684\u8d77\u6b62\u4f4d\u7f6e\u7684\u9ad8\u4eae\u6ca1\u95ee\u9898\u4e86\uff0c\u4f46\u662f\u53c8\u51fa\u73b0\u4e86\u5176\u4ed6\u7684\u95ee\u9898\uff0c\u7406\u8bba\u4e0a\uff0c\u5e94\u8be5\u662f\u6807\u98982\u9ad8\u4eae\uff0c\u73b0\u5728\u6eda\u52a8\u9ad8\u5ea6\u4e3a0\u7684\u65f6\u5019\u5f3a\u5236\u6807\u98981\u9ad8\u4eae\uff0c\u6b64\u65f6\uff0c\u518d\u6eda\u52a8\uff0c\u662f\u4e0d\u4f1a\u89e6\u53d1\u6807\u98982\u7684\u4ea4\u53c9\u884c\u4e3a\u7684\uff0c\u56e0\u6b64\u6807\u98982\u4e00\u76f4\u65e0\u6cd5\u9ad8\u4eae\u3002<img decoding=\"async\" src=\"\/\/mat1.gtimg.com\/www\/mb\/images\/face\/36.gif\" align=\"absmiddle\"><\/p>\n<p>\u7136\u540e\u901a\u8fc7\u8bbe\u7f6e\u4e00\u4e2a\u5197\u4f59\u6807\u5fd7\u91cf\u7684\u65b9\u5f0f\u4fee\u590d\u4e86\u8fd9\u4e2a\u95ee\u9898\uff0c\u57fa\u672c\u4e0a\u4f53\u9a8c\u4e0b\u6765\u8fd8\u884c\uff0c\u4f46\u5076\u5c14\u8fd8\u662f\u6709\u6807\u9898\u8df3\u8fc7\u7684\u95ee\u9898\uff0c\u4f24\u5fc3\u2026\u2026 <img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/emtion\/emoji\/1f494.svg\" width=\"20\" height=\"20\" align=\"absmiddle\"><\/p>\n<p>\u6211\u4e00\u770b\u65f6\u95f4\uff0c\u5df2\u7ecf\u51cc\u66681\u70b9\u4e86\uff0c\u7b54\u5e94\u5bb6\u91cc\u7684\u9886\u5bfc12:30\u7761\u89c9\u7684\uff0c\u4e8e\u662f\uff0c\u5148\u653e\u7740\uff0c\u5173\u673a\u7761\u89c9\u3002<\/p>\n<hr>\n<p>\u65f6\u95f4\u6765\u5230\u4e86\u4eca\u5929\uff0c\u5468\u4e00\uff0c<del datetime=\"2020-12-02T12:33:46+00:00\">2010<\/del>2020\u5e7411\u6708\u6700\u540e1\u5929\uff0c\u4e0b\u73ed\u56de\u5bb6\uff0c\u53c8\u6253\u5f00\u6628\u5929\u5199\u7684\u4ee3\u7801\uff0c\u7422\u78e8\u7740\u8fd9\u6b6a\u74dc\u88c2\u67a3\u7684\u4ee3\u7801\u3001\u4ee5\u53ca\u90a3\u4e2a\u4e0d\u5f97\u5df2\u7528\u4e0a\u7684\u6eda\u52a8\u4e8b\u4ef6\u4ee3\u7801\u662f\u4e0d\u662f\u53ef\u4ee5\u4f18\u5316\u7684\uff0c\u6709\u6ca1\u6709\u529e\u6cd5\u7eaf\u7cb9\u901a\u8fc7\u4ea4\u53c9\u68c0\u6d4b\u5b9e\u73b0\u3002<\/p>\n<p>\u5237\u5237\u5fae\u535a\u5582\u5582\u9c7c\uff0c\u770b\u4f3c\u5728\u6e38\u8361\uff0c\u5b9e\u9645\u4e0a\u5728\u627e\u7075\u611f\u3002<\/p>\n<p>\u53cd\u95ee\u4e86\u81ea\u5df1\u4e00\u4e2a\u95ee\u9898\uff0c\u201c\u4e3a\u4ec0\u4e48\u6211\u540e\u6765\u6298\u817e\u4e86\u90a3\u4e48\u591a\u9b3c\u4e1c\u897f\uff1f\u201d<\/p>\n<p>\u8fd9\u4e2a\u95ee\u9898\u5f88\u597d\u56de\u7b54\uff1a\u201c\u4e00\u5f00\u59cb\u7684\u65f6\u5019\u6807\u98981\u5e94\u8be5\u9ad8\u4eae\uff0c\u4f46\u662f\u9ad8\u4eae\u4e86\u6807\u98982\uff0c\u5e94\u8be52\u8005\u9ed8\u8ba4\u90fd\u5728\u5c4f\u5e55\u5185\uff0c\u7531\u4e8e\u4e00\u6b21\u53ea\u80fd\u9ad8\u4eae\u4e00\u4e2a\uff0c\u56e0\u6b64\uff0c\u5904\u5728\u540e\u9762\u7684\u6807\u98982\u9ad8\u4eae\u4e86\u3002\u201d<\/p>\n<p>\u8fd9\u4e2a\u65f6\u5019\uff0c\u6211\u8111\u4e2d\u7a81\u7136\u64e6\u51fa\u4e86\u4e00\u70b9\u706b\u82b1\uff0c\u8fd9\u5c0f\u624b\u554a\uff0c\u5c31\u50cf\u4e0d\u53d7\u63a7\u5236\u4e00\u6837\uff0c\u8fd8\u539f\u5230\u6700\u521d\u4e0d\u8bbe\u7f6e<code>rootMargin<\/code>\u53c2\u6570\u7684\u72b6\u6001\uff0c\u7136\u540e\u5728<code>entries.forEach<\/code>\u4e2d\u95f4\u52a0\u4e86\u4e2a\u5c0f\u5c0f\u7684<code>reverse()<\/code>\uff0c\u5982\u4e0b\u622a\u56fe\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202012\/2020-12-01_000517.png\" width=\"364\" height=\"82\" alt=\"\u53cd\u5e8f\u4ee3\u7801\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u7136\u540e\u518d\u4e00\u4f53\u9a8c\uff0c\u6211\u4e86\u4e2a\u64e6\uff0c\u8fd9\u4e0d\u516b\u4e5d\u4e0d\u79bb\u5341\u4e86\u561b\uff0c\u6b63\u5411\u6eda\u52a8\u57fa\u672c\u7b26\u5408\u9884\u671f\uff0c\u81f3\u5c11\u4e00\u8fdb\u6765\u7684\u65f6\u5019\uff0c\u6216\u8005\u6eda\u52a8\u5230\u9876\u90e8\u7684\u65f6\u5019\u9ad8\u4eae\u7684\u662f\u7b2c1\u4e2a\u6807\u9898\u5143\u7d20\u3002<\/p>\n<p>\u4f46\u662f\uff0c\u53c8\u6709\u65b0\u7684\u95ee\u9898\uff0c\u5f53\u6807\u98981\u5728\u5c4f\u5e55\u4e4b\u5916\uff0c\u4f46\u662f\u6807\u98982\u5728\u5c4f\u5e55\u5185\u7684\u65f6\u5019\uff0c\u6807\u98982\u5e76\u6ca1\u6709\u9ad8\u4eae\uff0c\u56e0\u4e3a\u6807\u98982\u4e00\u76f4\u5728\u5c4f\u5e55\u4e2d\uff1b\u4e5f\u5c31\u662f\uff0c\u5f53\u6807\u98981\u3001\u6807\u98982\u540c\u65f6\u5728\u5c4f\u5e55\u4e2d\uff0c\u6807\u98981\u6eda\u8d70\u7684\u65f6\u5019\uff0c\u6807\u98982\u662f\u4e0d\u4f1a\u89e6\u53d1<code>entry.isIntersecting<\/code>\u7684\uff0c\u56e0\u4e3aIntersectionObserver API\u4e2d\u7684callback\u662f\u76f8\u4ea4\u53d8\u5316\u7684\u65f6\u5019\u624d\u89e6\u53d1\u3002<\/p>\n<p>\u8fd9\u4e2a\u95ee\u9898\u597d\u529e\uff0c\u6211\u7acb\u523b\u5c31\u6709\u4e86\u601d\u8def\uff0c\u5728\u5143\u7d20\u79fb\u51fa\u5c4f\u5e55\u7684\u65f6\u5019\u505a\u4e00\u4e2a\u53bb\u9ad8\u4eae\u5904\u7406\u3002<\/p>\n<p>\u4e8e\u662f\u6838\u5fc3\u4ee3\u7801\u5c31\u53d8\u6210\u8fd9\u6837\uff1a<\/p>\n<pre>entries.reverse().forEach(function (entry) {\r\n    if (entry.isIntersecting) {\r\n        entry.target.active();  \r\n    } else if (entry.target.isActived) {\r\n        entry.target.unactive();  \r\n    }\r\n});<\/pre>\n<p>\u4e5f\u5c31\u662f\u5982\u679c\u5f53\u524d\u5143\u7d20\u672c\u8eab\u662f\u6fc0\u6d3b\u7684\uff0c\u90a3\u4ed6\u79fb\u51fa\u5c4f\u5e55\u5219\u5c31\u8981\u5931\u6d3b\uff0c\u8ba9\u5176\u4ed6\u5143\u7d20\u9ad8\u4eae\uff08\u8fd9\u4e2a\u903b\u8f91\u5728<code>unactive()<\/code>\u65b9\u6cd5\u4e2d\u5b8c\u6210\uff09\u3002<\/p>\n<p>\u6838\u5fc3\u601d\u8def\u6ca1\u95ee\u9898\uff0c\u5176\u4ed6\u5c31\u662f\u7ec6\u8282\u4e0a\u7684\u4fee\u4fee\u8865\u8865\uff0c\u5982\u5143\u7d20\u521b\u5efa\u3001\u70b9\u51fb\u5bfc\u822a\u5143\u7d20\u7684\u5b9a\u4f4d\u7b49\uff0c\u76f8\u5173\u7ec6\u8282\u5c31\u4e0d\u5c55\u5f00\u4e86\u3002<\/p>\n<p>\u6700\u7ec8\u6548\u679c\u5b9e\u73b0\u540e\u4e00\u4f53\u9a8c\uff0c\u8036\u8036\u8036\uff0c\u52d2\u6b27\u52d2\u6b27\u52d2\uff0c\u4e4b\u524d\u6709\u5143\u7d20\u4e0d\u9009\u4e2d\u7684\u95ee\u9898\u6ca1\u6709\u4e86\uff0c\u81f3\u5c11\u5728\u76ee\u524d\u8fd9\u4e2ademo\u4e2d\u6ca1\u6709\u4e86\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202011\/intersection-observer-title-nav.html\" rel=\"noopener\" target=\"_blank\">IntersectionObserver\u81ea\u52a8\u751f\u6210\u5bfc\u822ademo<\/a><\/p>\n<p>\u624b\u673a\u7aef\u4e0d\u65b9\u4fbf\u4f53\u9a8c\u4e86\u4e5f\u53ef\u4ee5\u770b\u4e0b\u9762\u7684\u90e8\u5206\u533a\u57df\u7684GIF\u5f55\u5c4f\u6548\u679c\uff08\u70b9\u51fb\u64ad\u653e 189K\uff09\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202012\/scroll-nav.png\" width=\"335\" height=\"412\" alt=\"\u6eda\u52a8\u5b9a\u4f4d\u5f55\u5c4fGIF\" class=\"alignnone size-medium\" onclick=\"this.src=this.src.replace('.png', '.gif');\" \/><\/p>\n<p>\u8fd9\u4e00\u7248\u7684\u5b9e\u73b0\u5b8c\u5168\u6ca1\u6709\u7528\u5230scroll\u4e8b\u4ef6\uff0c\u5b8c\u6210\u4e86\u81ea\u5df1\u7684\u521d\u8877\uff0c\u771f\u6b63\u4f53\u4f1a\u5230\u4e86\uff0c\u67f3\u6697\u82b1\u660e\u53c8\u4e00\u6751\u7684\u611f\u89c9\u3002<\/p>\n<h3>\u56db\u3001\u4f7f\u7528\u3001\u8bed\u6cd5\u4ee5\u53ca\u6ce8\u610f\u4e8b\u9879<\/h3>\n<p>\u4f7f\u7528\u65b9\u6cd5\u5982\u4e0b\u3002<\/p>\n<p>\u9996\u5148\u5f15\u5165JS\u6587\u4ef6\uff1a<\/p>\n<pre>&lt;script src=\".\/smart-nav.js\"&gt;&lt;\/script&gt;<\/pre>\n<p>JS\u6587\u4ef6\u5728\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202011\/smart-nav.js\" rel=\"noopener\" target=\"_blank\">smart-nav.js<\/a><\/p>\n<p>\u7136\u540e\u4f7f\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>smartNav('article h3');<\/pre>\n<p>\u4f1a\u628a\u7b26\u5408\u9009\u62e9\u5668<code>'article h3'<\/code>\u7684\u5143\u7d20\u805a\u5408\u6210\u548c\u5feb\u901f\u5b9a\u4f4d\u7684\u5bfc\u822a\u5143\u7d20\u3002<\/p>\n<h4>\u8bed\u6cd5<\/h4>\n<pre>smartNav(elements, options);<\/pre>\n<p>\u5176\u4e2d\uff1a<\/p>\n<dl>\n<dt>elements<\/dt>\n<dd>\u5fc5\u9700\u3002\u6807\u9898\u5143\u7d20\u4eec\uff0c\u53ef\u4ee5\u662fNodelist\u5bf9\u8c61\uff0c\u4e5f\u53ef\u4ee5\u662f\u5143\u7d20\u7684\u9009\u62e9\u5668\u5b57\u7b26\u4e32\u3002<\/dd>\n<dt>options<\/dt>\n<dd>\u53ef\u9009\u3002\u76ee\u524d\u652f\u6301\u4e00\u4e2a\u53c2\u6570\u5982\u4e0b\u8868\uff1a<\/dd>\n<table border=\"0\" width=\"100%\" class=\"params_table\" cellspacing=\"1\">\n<thead>\n<tr>\n<th>API\u540d\u79f0<\/th>\n<th>\u9ed8\u8ba4\u503c<\/th>\n<th>\u91ca\u4e49<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>nav<\/td>\n<td>null<\/td>\n<td>\u5bfc\u822a\u5bb9\u5668\u5bf9\u8c61\uff0c\u521b\u5efa\u7684\u5bfc\u822a\u5217\u8868\u4f1aappend\u5230\u8fd9\u91cc\u3002\u5982\u679c\u4e3anull\uff0c\u672cJS\u4f1a\u81ea\u52a8\u521b\u5efa\u4e00\u4e2a\u5bb9\u5668\u5143\u7d20\uff0c\u7ed3\u6784\u4e3a\uff1adiv.title-nav-ul &gt; a.title-nav-li<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/dl>\n<p>\u4e5f\u5c31\u662f\u5bfc\u822a\u6837\u5f0f\u9700\u8981\u81ea\u5df1CSS\u8bbe\u7f6e\u3002<\/p>\n<h4>\u5176\u4ed6\u8bf4\u660e<\/h4>\n<p>\u672cJS\u662f\u81ea\u5df1\u4ee5\u5b66\u4e60\u76ee\u7684\u4e3a\u4e3b\u7684\u5b9e\u9a8c\u4ea7\u54c1\uff0c\u6ca1\u6709\u8003\u8651\u517c\u5bb9\u6027\uff0c\u7531\u4e8e\u91c7\u7528\u4e86\u6bd4\u8f83\u65b0\u9896\u7684\u539f\u7406\u5b9e\u73b0\uff0c\u56e0\u6b64\uff0c\u4e0d\u80fd\u4fdd\u8bc1\u4ea4\u4e92\u529f\u80fd\u7684\u7a33\u5065\u6027\uff0c\u4e5f\u5c31\u662f\u53ef\u80fd\u6709\u9884\u671f\u4e4b\u5916\u7684\u8868\u73b0\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u5efa\u8bae\u5927\u5bb6\u4e0d\u8981\u5728\u6b63\u5f0f\u7684\u9879\u76ee\u4e2d\u4f7f\u7528\u3002<\/p>\n<p>\u4e3a\u4e86\u65b9\u4fbf\u5927\u5bb6\u5b66\u4e60\uff0c\u6211\u628a\u8fd9\u4e2aJS\u4ee5\u9879\u76ee\u5f62\u5f0f\u5f00\u6e90\u5230gitee\u4e86\uff1a<a href=\"https:\/\/gitee.com\/zhangxinxu\/smart-nav\" class=\"a_link\" rel=\"noopener\" target=\"_blank\">https:\/\/gitee.com\/zhangxinxu\/smart-nav<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202012\/2020-12-01_002953.png\" width=\"553\" height=\"376\" alt=\"smart-nav\u9879\u76ee\u622a\u56fe\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u6b22\u8fce\u53cd\u9988\u5176\u4e2d\u5b9e\u73b0\u7684\u95ee\u9898\uff0c\u6216\u8005\u4f60\u6709\u66f4\u597d\u7684\u5b9e\u73b0\u4e5f\u6b22\u8fce\u6307\u51fa\u3002<\/p>\n<h3>\u4e94\u3001\u610f\u4e49\u3001\u7ed3\u675f\u8bed<\/h3>\n<p>\u867d\u7136\u8bf4\u6298\u817e\u4e861\u4e2a\u4e0b\u5348+\u4e24\u4e2a\u665a\u4e0a\uff0c\u5c31\u6298\u817e\u51fa\u4e86\u53ea\u80fd\u5728\u4e2a\u4eba\u9879\u76ee\u3001\u5b9e\u9a8c\u9879\u76ee\u4e2d\u4f7f\u7528\u7684\u4ee3\u7801\uff0c\u770b\u8d77\u6765\u505a\u4e86\u4e00\u4ef6\u6295\u5165\u4ea7\u51fa\u6bd4\u5f88\u4f4e\u7684\u4e8b\u60c5\u3002\u5982\u679c\u628a\u8fd9\u4e48\u591a\u65f6\u95f4\u7528\u6765\u53bb\u5916\u9762\u63a5\u4e2a\u6d3b\uff0c\u660e\u9762\u4e0a\u8d5a\u5f97\u80af\u5b9a\u6bd4\u778e\u6298\u817e\u8d5a\u5f97\u591a\u3002<\/p>\n<p>\u5b9e\u9645\u4e0a\uff0c\u975e\u4e5f\uff01<\/p>\n<p>\u4ece\u957f\u8fdc\u6765\u770b\uff0c\u6743\u8861\u5404\u79cd\u6536\u76ca\uff0c\u778e\u6298\u817e\u89c9\u5f97\u8d5a\u7684\u66f4\u591a\uff0c\u4ed6\u53ea\u662f\u5728\u672a\u6765\uff0c\u6216\u5f53\u4e0b\uff0c\u4ee5\u4e00\u79cd\u66f4\u52a0\u65e0\u5f62\u7684\u65b9\u5f0f\u53cd\u9988\u7ed9\u4e86\u4f60\u3002<\/p>\n<p>\u4e13\u4e1a\u6210\u957f\u4e86\uff0c\u5bf9IntersectionObserver\u8fd9\u4e2aAPI\u6709\u4e86\u66f4\u52a0\u76f4\u89c2\u4e14\u6df1\u5165\u7684\u63a5\u89e6\uff0c\u4e0b\u4e00\u6b21\u4f7f\u7528\u7684\u65f6\u5019\u5c31\u80fd\u5feb\u901f\u4e0a\u624b\uff1b\u6709\u4e86\u4ea7\u51fa\uff0c\u4e0d\u4ec5\u6709\u4ee3\u7801\uff0c\u8fd8\u6709\u6587\u6863\uff0c\u90fd\u4f1a\u4f5c\u4e3a\u4e2a\u4eba\u5f71\u54cd\u529b\uff0c\u6216\u8005\u8bf4\u5bf9\u884c\u4e1a\u7684\u4ef7\u503c\uff0c\u5728\u65e5\u540e\u7684\u5de5\u4f5c\u3001\u6216\u8005\u5176\u4ed6\u4e8b\u52a1\u4e2d\u4ee5\u66f4\u9690\u853d\u7684\u65b9\u5f0f\u9988\u8d60\u7ed9\u4f60\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5f88\u591a\u4eba\u4e70\u6211\u5199\u7684\u300aCSS\u4e16\u754c\u300b\u548c\u300aCSS\u9009\u62e9\u5668\u300b\u4e16\u754c\uff0c\u5c31\u4f1a\u53d7\u5230\u6211\u535a\u5ba2\u65e5\u79ef\u6708\u7d2f\u5199\u4f5c\u7684\u5f71\u54cd\uff0c\u65e0\u5f62\u4e2d\u589e\u52a0\u4e86\u81ea\u5df1\u7684\u6536\u76ca\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u8d70\u4e13\u4e1a\u8def\u7ebf\uff0c\u5343\u4e07\u4e0d\u8981\u6709\u529f\u5229\u7684\u601d\u60f3\u3002<\/p>\n<p>\u6211\u5b66\u7684\u8fd9\u4e2a\u4e1c\u897f\u4ee5\u540e\u4f1a\u4e0d\u4f1a\u706b\uff0c\u6709\u6ca1\u6709\u7528\uff0c\u80fd\u4e0d\u80fd\u8d5a\u94b1\u3002\u57fa\u672c\u4e0a\uff0c\u6709\u8fd9\u79cd\u5fc3\u6001\u7684\u4eba\uff0c\u90fd\u4e0d\u9002\u5408\u8d70\u4e13\u4e1a\u8def\u7ebf\u3002<\/p>\n<p>\u5927\u5bb6\u6709\u5174\u8da3\u53ef\u4ee5\u770b\u770b\u6211\u6700\u8fd120\u7bc7\u6587\u7ae0\uff0c\u4e00\u534a\u7684\u6587\u7ae0\u662f\u57fa\u7840API\u4ecb\u7ecd\uff0c\u53e6\u5916\u4e00\u534a\u5168\u6211\u90fd\u662f\u81ea\u521b\u7684\u6280\u672f\u5b9e\u73b0\uff0c\u6709\u4e9b\u6e90\u81ea\u9879\u76ee\uff0c\u6709\u4e9b\u6e90\u81ea\u7075\u611f\u3002<\/p>\n<p>\u6240\u6709\u8fd9\u4e00\u5207\u90fd\u662f\u6e90\u81ea\u4e8e\u6bcf\u5929\u4e0d\u95f4\u65ad\u7684\u57fa\u7840\u77e5\u8bc6\u79ef\u7d2f\uff0c\u79ef\u7d2f\u7684\u8db3\u591f\u591a\uff0c\u81ea\u7136\u80fd\u591f\u89e6\u7c7b\u65c1\u901a\uff0c\u60f3\u6cd5\u5c31\u4f1a\u5c42\u51fa\u4e0d\u7a77\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u8fd9\u51e0\u5929\u7684\u6298\u817e\u6709\u6ca1\u6709\u610f\u4e49\u5462\uff1f<\/p>\n<p>\u80af\u5b9a\u662f\u6709\u7684\uff01<\/p>\n<p>\u8bf4\u4e0d\u5b9a\u54ea\u5929\u5728\u5176\u4ed6\u573a\u5408\u53c8\u4f1a\u89e6\u53d1\u4e0d\u4e00\u6837\u7684\u82b1\u706b\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202012\/2020-12-01_005023.png\" width=\"120\" height=\"84\" alt=\"\u82b1\u706b\" class=\"alignnone size-medium\" \/><\/p>\n<p>OK\uff0c\u53c8\u51cc\u66681\u70b9\u4e86\uff0c\u5c31\u4e0d\u7ee7\u7eed\u5520\u55d1\u4e86\u3002<\/p>\n<p>\u611f\u8c22\u60a8\u575a\u6301\u9605\u8bfb\u5230\u6b64\u5904\uff0c\u5982\u679c\u60a8\u89c9\u5f97\u770b\u8fd9\u7bc7\u6587\u7ae0\u8fd8\u7b97\u6709\u70b9\u6536\u83b7\uff0c\u6b22\u8fce\u8f6c\u53d1\uff0c\u6b22\u8fce\u5206\u4eab\uff0c\u6bd4\u5fc3\uff01<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/emtion\/emoji\/2764.svg\" width=\"20\" height=\"20\" align=\"absmiddle\"><\/p>\n<p>\u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\uff0c\u6b22\u8fce\u5206\u4eab\uff0c\u52ff\u5168\u6587\u8f6c\u8f7d\uff0c\u5982\u679c\u5b9e\u5728\u559c\u6b22\uff0c\u53ef\u6536\u85cf\uff0c\u6c38\u4e0d\u8fc7\u671f\uff0c\u4e14\u4f1a\u53ca\u65f6\u66f4\u65b0\u77e5\u8bc6\u70b9\u53ca\u4fee\u6b63\u9519\u8bef\uff0c\u9605\u8bfb\u4f53\u9a8c\u4e5f\u66f4\u597d\u3002<br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=9707\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=9707<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202012\/intersection-observer-cover.png\" width=\"160\" height=\"102\" alt=\"\u5357\u74dc\u5c01\u9762\u56fe\" class=\"alignright size-medium\" loading=\"lazy\" \/><\/p>\n<p>\u5b66\u4e60\u4e86\u4e0bJS\u4e2d\u975e\u5e38\u9002\u5408\u5b9e\u73b0\u61d2\u52a0\u8f7d\u548c\u65e0\u9650\u56fa\u5b9a\u52a0\u8f7d\u7684IntersectionObserver 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