{"id":5875,"date":"2017-01-17T00:56:02","date_gmt":"2017-01-16T16:56:02","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=5875"},"modified":"2019-11-28T18:59:46","modified_gmt":"2019-11-28T10:59:46","slug":"share-a-animation-algorithm-js","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2017\/01\/share-a-animation-algorithm-js\/","title":{"rendered":"\u5206\u4eab\u4e00\u4e2a\u5373\u63d2\u5373\u7528\u7684\u79c1\u85cf\u7f13\u52a8\u52a8\u753bJS\u5c0f\u7b97\u6cd5"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=5875\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=5875<\/a><br \/>\n\u672c\u6587\u53ef\u5168\u6587\u8f6c\u8f7d\uff0c\u4f46\u9700\u5f97\u5230\u539f\u4f5c\u8005\u4e66\u9762\u8bb8\u53ef\uff0c\u540c\u65f6\u4fdd\u7559\u539f\u4f5c\u8005\u548c\u51fa\u5904\uff0c\u6458\u8981\u5f15\u6d41\u5219\u968f\u610f\u3002<\/p>\n<style>.entry button { font-size: 100%; height: 2em; }<\/style>\n<h3>\u4e00\u3001\u52a8\u753b\u7b97\u6cd5\u7684\u6545\u4e8b<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/201701\/u-chulian-s.jpg\" width=\"400\" height=\"225\" alt=\"\u751c\u5982\u521d\u604b\" class=\"alignnone\" \/><\/p>\n<p>\u4eba\u662f\u4e00\u79cd\u604b\u65e7\u7684\u52a8\u7269\uff0c\u5373\u4f7f\u8fc7\u4e86\u5f88\u591a\u5e74\uff0c\u5373\u4f7f\u5c0f\u5c41\u5b69\u5df2\u7ecf\u5b66\u4f1a\u4e86\u6253\u9171\u6cb9\uff0c\u4f46\u662f\uff0c\u8fd9\u5fc3\u4e2d\u90a3\uff0c\u603b\u662f\u65f6\u4e0d\u65f6\u4f1a\u60f3\u8d77\u521d\u604b\u7684\u90a3\u4e2a\u5979\uff0c\u867d\u672a\u63d0\u53ca\uff0c\u4f46\u5728\u5fc3\u91cc\u3002<\/p>\n<p>\u5982\u679c\u52a8\u753b\u7b97\u6cd5\u662f\u604b\u4eba\u7684\u8bdd\uff0c\u90a3\u4e5f\u6709\u7c7b\u4f3c\u7684\u6545\u4e8b\u3002<\/p>\n<p>\u5f53\u5e74\u8fd8\u662f\u4e2a\u9752\u6da9\u7537\u5b69\u7684\u65f6\u5019\uff0c\u4ec0\u4e48\u90fd\u662f\u61f5\u61f5\u61c2\u61c2\uff0c\u5b9e\u73b0\u6548\u679c\u8981\u4e48\u5e72\u5df4\u5df4\uff0c\u8981\u4e48\u62ff\u6765\u4e3b\u4e49\u3002\u76f4\u5230\u4e00\u6b21\u5076\u7136\u7684\u9082\u9005\uff0c\u4e00\u6b21\u51a5\u51a5\u4e2d\u6ce8\u5b9a\u7684\u9082\u9005\uff0c\u6211\u9047\u5230\u4e86\u5979\uff0c\u5979\u662f\u5982\u6b64\u7b80\u5355\u53ef\u7231\uff0c\u8ba9\u6211\u8fc7\u76ee\u4e0d\u5fd8\u3002\u4e8e\u662f\uff0c\u4e00\u4e0b\u5b50\u81ea\u5df1\u4eff\u4f5b\u6253\u5f00\u4e86\u4e00\u6247\u65b0\u7684\u7a97\uff0c\u6709\u4e86\u5979\u7684\u76f8\u4f34\uff0c\u5b9e\u73b0\u7684\u6548\u679c\u4e0d\u518d\u662f\u5e72\u5df4\u5df4\u7684\uff0c\u800c\u662f\u5f00\u59cb\u6709\u4e86\u7eda\u4e3d\u7684\u8272\u5f69\uff0c\u5f00\u59cb\u6709\u4e86\u7075\u52a8\u7684\u6c14\u606f\u3002<\/p>\n<p>\u540e\u6765\uff0c\u6211\u6210\u957f\u4e86\uff0c\u63a5\u89e6\u4e86\u8d8a\u6765\u8d8a\u591a\u7684\u5916\u9762\u7684\u4e16\u754c\uff0c\u9047\u5230\u4e86\u8d8a\u6765\u8d8a\u591a\u662f\u52a8\u753b\u7b97\u6cd5\uff0c\u8fd9\u4e9b\u7b97\u6cd5\u786e\u5b9e\u5f88\u7f8e\uff0c\u5b9e\u73b0\u7684\u6548\u679c\u66f4\u4f73\u7684\u70ab\u4e3d\uff0c\u751a\u81f3\u5c06\u5979\u4eec\u5168\u90e8\u6536\u7eb3\u6574\u7406\u6210\u4e86\u540e\u5bab\u5bb6\u65cf\uff08\u53ef\u53c2\u8003\u4e4b\u524d\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2016\/12\/how-use-tween-js-animation-easing\/\">\u5982\u4f55\u4f7f\u7528Tween.js\u5404\u7c7b\u539f\u751f\u52a8\u753b\u8fd0\u52a8\u7f13\u52a8\u7b97\u6cd5<\/a>\u201d\u8fd9\u7bc7\u6587\u7ae0\uff09\uff0c\u4f46\u662f\uff0c\u5b9e\u9645\u5f00\u53d1\u7684\u65f6\u5019\uff0c\u4f7f\u7528\u7684\u6700\u591a\u7684\u8fd8\u662f\u6700\u521d\u7684\u90a3\u4e2a\u5979\uff0c\u4e0d\u4ec5\u662f\u56e0\u4e3a\u5979\u7ed9\u6211\u5e26\u6765\u4e86\u5f88\u591a\u7f8e\u597d\u7684\u56de\u5fc6\uff0c\u66f4\u91cd\u8981\u7684\u662f\u8fd9\u4e48\u591a\u5e74\u8fc7\u53bb\u4e86\uff0c\u5979\u4e00\u76f4\u4fdd\u6301\u7740\u90a3\u4efd\u7b80\u5355\uff0c\u548c\u5916\u9762\u7684\u90a3\u4e9b\u5996\u8273*\u8d27\u5b8c\u5168\u4e0d\u4e00\u6837\u3002<\/p>\n<p>\u800c\u8fd9\u4e2a\u76f8\u4f34\u81ea\u5df1\u6700\u4e45\uff0c\u6700\u65e0\u6cd5\u5fd8\u6000\u7684\u3001\u4f7f\u7528\u6700\u591a\u7684\u5979\u5c31\u662f\u672c\u6587\u8981\u5206\u4eab\u7684\u79c1\u85cf\u7684\u52a8\u753b\u5c0f\u7b97\u6cd5\u3002<\/p>\n<p><a href=\"https:\/\/github.com\/zhangxinxu\/Tween\" target=\"_blank\">Tween.js\u4e2d\u7684\u52a8\u753b\u7b97\u6cd5<\/a>\u867d\u7136\u6807\u51c6\u5168\u9762\u4e14\u5f3a\u5927\uff0c\u4f46\u662f\uff0c\u91cc\u9762\u7684\u516c\u5f0f\u7565\u590d\u6742\uff0c\u6839\u672c\u5c31\u8bb0\u4e0d\u4f4f\uff0c\u6bcf\u6b21\u4f7f\u7528\u90fd\u8981\u53bb\u627e\u4e00\u4e0b\uff0c\u751a\u662f\u9ebb\u70e6\u3002<\/p>\n<p>\u800c\u4e14\uff0c\u5e73\u65f6\u5f00\u53d1\uff0c\u7edd\u5927\u591a\u6570\u573a\u666f\u4e0b\uff0c\u6211\u4eec\u5e76\u4e0d\u9700\u8981\u662f\u90a3\u79cd\u5f39\u6765\u5f39\u53bb\u7684\u6d6e\u5938\u6548\u679c\uff0c\u6709\u70b9\u7f13\u52a8\u5c31\u53ef\u4ee5\uff0c\u672c\u6587\u8981\u5206\u4eab\u7684\u52a8\u753b\u5c0f\u7b97\u6cd5\u5c31\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u7f13\u52a8\u5c0f\u7b97\u6cd5\u3002<\/p>\n<h3>\u4e8c\u3001\u5373\u63d2\u5373\u7528\u7684\u7f13\u52a8\u5c0f\u7b97\u6cd5<\/h3>\n<p>\u539f\u7406\u5982\u4e0b\uff1a<\/p>\n<p>\u5047\u8bbe\u8981\u4ece\u6570\u503cA\u53d8\u5316\u5230\u6570\u503cB\uff0c\u5982\u679c\u662f\u7ebf\u6027\u8fd0\u52a8\uff0c\u5219\u6bcf\u6b21\u79fb\u52a8\u8ddd\u79bb\u662f\u4e00\u6837\uff1b\u5982\u679c\u662f\u7f13\u52a8\uff0c\u6bcf\u6b21\u79fb\u52a8\u8ddd\u79bb\u4e0d\u4e00\u6837\u3002\u90a3\u5982\u4f55\u624d\u80fd\u4e0d\u4e00\u6837\u5462\uff1f\u5f88\u7b80\u5355\uff0c\u6309\u6bd4\u4f8b\u79fb\u52a8\u5c31\u53ef\u4ee5\u3002<\/p>\n<p>\u4f8b\u5982\uff1a\u6bcf\u6b21\u79fb\u52a8\u5269\u4f59\u8ddd\u79bb\u7684\u4e00\u534a\u3002<\/p>\n<p>\u5bf9\u5427\uff0c\u8d85\u5bb9\u6613\u7406\u89e3\u7684\u3002<\/p>\n<p>\u6bd4\u65b9\u8bf4\uff1a\u4f60\u548c\u521d\u604b\u4e4b\u95f4\u8ddd\u79bb\u662f64\uff0c\u6bcf\u79d2\u79fb\u52a8\u4e00\u534a\uff0c\u5219\uff0c\u4f60\u4eec\u4e4b\u95f4\u7684\u8ddd\u79bb\u4e0b\u4e00\u79d2\u5c31\u662f32, \u518d\u4e0b\u4e00\u79d2\u5c31\u662f16\uff0c\u7136\u540e8\uff0c\u7136\u540e4\uff0c\u7136\u540e2\uff0c\u7136\u540e1\uff0c\u7136\u540e\u2026\u2026\u4f60\u4eec\u5c31\u5728\u4e00\u8d77\u4e86\u3002\u4f60\u4eec\u5728\u4e00\u8d77\u7684\u8fd9\u4e2a\u8fc7\u7a0b\u5c31\u662f\u4e00\u4e2a\u5178\u578b\u7684\u5148\u5feb\u540e\u6162\u7684\u7f13\u52a8\u8fd0\u52a8\u8fc7\u7a0b\uff0c\u5982\u4e0b\u793a\u610f\u56fe\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/201701\/64-0-mark.png\" width=\"554\" height=\"36\" alt=\"\u4f4d\u7f6e\u79fb\u52a8\u6807\u6ce8\u793a\u610f\u56fe\" class=\"alignnone\" \/><\/p>\n<p>\u7528\u4e00\u4e2a\u7b80\u5355\u7684\u516c\u5f0f\u8868\u793a\u5c31\u662f\uff1a<\/p>\n<pre>A = A + (B - A) \/ 2<\/pre>\n<p>\u7ffb\u8bd1\u4e00\u4e0b\u5c31\u662f\uff1a<\/p>\n<pre>\u6211\u4e0b\u4e00\u79d2\u7684\u4f4d\u7f6e = \u73b0\u5728\u4f4d\u7f6e + \u73b0\u5728\u548c\u521d\u604b\u4e4b\u95f4\u8ddd\u79bb\u7684\u4e00\u534a<\/pre>\n<p>\u662f\u4e0d\u662f\u5f88\u597d\u7406\u89e3\u3002<\/p>\n<p>\u800c\u4e0a\u9762\u7684<code>A = A + (B - A) \/ 2<\/code>\u5c31\u662f\u672c\u6587\u8981\u4ecb\u7ecd\u7684\u5373\u63d2\u5373\u7528\u7684\u7f13\u52a8\u5c0f\u7b97\u6cd5\u3002<\/p>\n<p>\u5f53\u7136\u8981\u5b9e\u9645\u4f7f\u7528\u8fd8\u662f\u9700\u8981\u505a\u4e00\u70b9\u70b9\u7684\u5904\u7406\u7684\uff0c\u9996\u5148\uff0c\u65e2\u7136\u662f\u8fd0\u52a8\uff0c\u90a3\u5c31\u79bb\u4e0d\u5f00\u5b9a\u65f6\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<code>requestAnimationFrame<\/code>\uff0c\u5bf9\u4e8e\u4e0d\u652f\u6301\u7684\u6d4f\u89c8\u5668\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684\u517c\u5bb9\u4ee3\u7801\uff1a<\/p>\n<pre><span style=\"color:green;\">\/\/ requestAnimationFrame\u7684\u517c\u5bb9\u5904\u7406<\/span>\r\nif (!window.requestAnimationFrame) {\r\n    requestAnimationFrame = function(fn) {\r\n        setTimeout(fn, 17);\r\n    };\t\r\n}<\/pre>\n<p>\u4e0b\u9762\u6211\u4eec\u5957\u7528\u4e00\u4e2a\u7b80\u5355\u7684\u5b9e\u4f8b\uff0c\u770b\u770b\u8fd9\u4e2a\u7b97\u6cd5\u662f\u5982\u4f55\u5e94\u7528\u7684\uff0c\u5c31\u662f\u975e\u5e38\u5e38\u89c1\u7684\u8fd4\u56de\u9876\u90e8\u6548\u679c\u3002\u5f88\u591a\u7f51\u7ad9\u8fd4\u56de\u9876\u90e8\u8981\u4e48\u76f4\u63a5\u201c\u556a\u201d\u5230\u9876\u90e8\uff0c\u8981\u4e48\u52a8\u753b\u6309\u90e8\u5c31\u73ed\u6ca1\u6709\u7075\u6027\uff0c\u8fd9\u91cc\u6f14\u793a\u4e0b\u5982\u4f55\u4f7f\u7528\u5be5\u5be5\u6570\u884c\u4ee3\u7801\uff0c\u5b9e\u73b0\u5e26\u7f13\u52a8\u7684\u8fd4\u56de\u9876\u90e8\u6548\u679c\u3002\u70b9\u51fb\u4e0b\u9762\u7684\u6309\u94ae\u5373\u53ef\u770b\u5230\u8fd4\u56de\u9876\u90e8\u6548\u679c<span class=\"hidden\">\uff08\u5982\u679c\u6ca1\u6548\u679c\uff0c\u53ef\u80fd\u8bbf\u95ee\u7684\u4e0d\u662f\u539f\u59cb\u51fa\u5904\uff0c\u8bbf\u95ee\u4e0b\u9762\u5730\u5740\u4f53\u9a8c\u6548\u679c\uff0chttps:\/\/www.zhangxinxu.com\/wordpress\/?p=5875\uff09<\/span>\uff1a<\/p>\n<p><button onclick=\"backToTop();\">\u70b9\u51fb\u6211\u8fd4\u56de\u9876\u90e8<\/button><\/p>\n<p><script src=\"\/study\/201701\/backToTop.js\"><\/script><\/p>\n<p>\u70b9\u51fb\u6309\u94ae\u6267\u884c\u7684\u662f\u4e0b\u9762\u7684<code>backToTop()<\/code>\u65b9\u6cd5\uff1a<\/p>\n<pre><span style=\"color:green;\">\/\/ \u6eda\u52a8\u5230\u9876\u90e8\u7f13\u52a8\u5b9e\u73b0\r\n\/\/ rate\u8868\u793a\u7f13\u52a8\u901f\u7387\uff0c\u9ed8\u8ba4\u662f2<\/span>\r\nvar backToTop = function (rate) {\r\n    var doc = document.body.scrollTop? document.body : document.documentElement;\r\n    var scrollTop = doc.scrollTop;\r\n    \r\n    var top = function () {\r\n        scrollTop = scrollTop + (0 - scrollTop) \/ (rate || 2);\r\n        \r\n        <span style=\"color:green;\">\/\/ \u4e34\u754c\u5224\u65ad\uff0c\u7ec8\u6b62\u52a8\u753b<\/span>\r\n        if (scrollTop <= 1) {\r\n            doc.scrollTop = 0;\r\n            return;\r\n        }\r\n        doc.scrollTop = scrollTop;\r\n        <span style=\"color:green;\">\/\/ \u52a8\u753bgogogo!<\/span>\r\n        requestAnimationFrame(top);    \r\n    };\r\n    top();\r\n};<\/pre>\n<p>\u5176\u4e2d\uff0c\u4ee3\u7801\u7684\u6838\u5fc3\u662f\uff1a<\/p>\n<pre>scrollTop = scrollTop + (0 - scrollTop) \/ (rate || 2);<\/pre>\n<p><code>scrollTop<\/code>\u8868\u793a\u516c\u5f0f\u7684A, \u6eda\u52a8\u5230\u9876\u90e8\u6eda\u52a8\u9ad8\u5ea6\u662f<code>0<\/code>\uff0c\u56e0\u6b64\uff0c\u4e0a\u9762\u7684<code>0<\/code>\uff0c\u5b9e\u9645\u4e0a\u5c31\u662f\u516c\u5f0f\u7684B, \u800c\u516c\u5f0f\u4e2d\u7684<code>2<\/code>\u8868\u793a\u7f13\u52a8\u901f\u7387\uff0c\u5b9e\u9645\u5f00\u53d1\u7684\u65f6\u5019\u662f\u53ef\u4ee5\u7075\u6d3b\u8c03\u6574\u7684\uff0c\u7f13\u52a8\u901f\u7387\u8303\u56f4\u662f<code>1<\/code>\u5230\u65e0\u7a77\u5927\uff0c\u901f\u7387\u503c\u8d8a\u5c0f\uff0c\u8fd0\u52a8\u8d8a\u5feb\u3002\u6bd4\u5982\u8bf4\u4e0a\u9762\u7684\u8fd4\u56de\u9876\u90e8\u6548\u679c\uff0c\u6211\u4eec\u628a\u7f13\u52a8\u901f\u7387\u6539\u6210<code>4<\/code>\uff0c\u70b9\u51fb\u4e0b\u9762\u7684\u6309\u94ae\u611f\u53d7\u6548\u679c\uff1a<\/p>\n<p><button onclick=\"backToTop(4);\">\u70b9\u51fb\u6211\u6267\u884cbackToTop(4)<\/button><\/p>\n<p>\u53ef\u4ee5\u660e\u663e\u611f\u89c9\u5230\uff0c\u8fd4\u56de\u9876\u90e8\u4f7f\u7528\u7684\u65f6\u95f4\u53d8\u957f\u4e86\uff0c\u901f\u5ea6\u53d8\u6162\u4e86\uff0c\u7f13\u52a8\u4f53\u9a8c\u4e5f\u66f4\u660e\u663e\u4e86\u3002<\/p>\n<p>\u7b49\u6bd4\u4f8b\u9760\u8fd1\u7406\u8bba\u4e0a\u6700\u7ec8\u53ea\u4f1a\u65e0\u7a77\u9760\u8fd1\uff0c\u5e76\u4e0d\u4f1a\u771f\u6b63\u7684\u76f8\u7b49\uff0c\u4e5f\u5c31\u662f\u52a8\u753b\u6c38\u8fdc\u6ca1\u6709\u7ed3\u675f\u7684\u65f6\u5019\uff0c\u6240\u4ee5\u8bf4\u9700\u8981\u505a\u4e00\u4e2a\u4e34\u754c\u5224\u65ad\uff0c\u4e5f\u5c31\u662f\u8ddd\u79bb\u5c0f\u5230\u4e00\u5b9a\u6570\u76ee\u7684\u65f6\u5019\uff0c\u76f4\u63a5\u7b49\u4e8e\u76ee\u6807\u503c\uff0c\u5e76\u7ec8\u6b62\u52a8\u753b\u3002\u4f8b\u5982\uff0c\u4e0a\u9762\u7684\u8fd4\u56de\u9876\u90e8\uff0c\u5c31\u662f\u5f53\u8ddd\u79bb\u9876\u90e8\u6eda\u52a8\u9ad8\u5ea6\u5c0f\u4e8e<code>1<\/code>\u7684\u65f6\u5019\uff0c\u76f4\u63a5\u8fd4\u56de\u9876\u90e8\uff0c\u5e76\u7ec8\u6b62\u52a8\u753b\u3002<\/p>\n<pre>if (scrollTop &lt; 1) {\r\n    doc.scrollTop = 0;\r\n    return;\r\n}<\/pre>\n<p>\u6211\u4eec\u6700\u8fd1\u521a\u4e0a\u7ebf\u4e0d\u4e45\u7684\u65b0\u7248\u7684<a href=\"https:\/\/m.qidian.com\" target=\"_blank\">\u8d77\u70b9\u79fb\u52a8\u7ad9<\/a>\uff08https:\/\/m.qidian.com\uff09\u7684\u8fd4\u56de\u9876\u90e8\u6548\u679c\u5c31\u662f\u4f7f\u7528\u7684\u8fd9\u4e2a\u7f13\u52a8\u5c0f\u7b97\u6cd5\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/201701\/2017-01-17_005933.png\" width=\"179\" height=\"144\" alt=\"\u8fd4\u56de\u9876\u90e8\u622a\u56fe\u793a\u610f\" class=\"alignnone\" \/><\/p>\n<p>\u5f53\u7136\uff0c<a href=\"https:\/\/m.qidian.com\" target=\"_blank\">\u8d77\u70b9M\u7ad9<\/a>\u4f7f\u7528\u8fd9\u4e2a\u52a8\u753b\u5c0f\u7b97\u6cd5\u7684\u5730\u65b9\u4e0d\u6b62\u8fd9\u4e00\u4e2a\uff0c\u6bd4\u65b9\u8bf4\u9996\u9875\u6700\u8fd1\u9605\u8bfb\u7684\u5c0f\u7403\u662f\u53ef\u4ee5\u79fb\u52a8\u7684\uff0c\u60ef\u6027\u8fd0\u52a8\u52a8\u753b\u6548\u679c\u5c31\u662f\u7528\u7684\u8be5\u7b97\u6cd5\uff0c\u8fd8\u662f\u4e66\u7c4d\u9605\u8bfb\u9875\u9762\u6c34\u5e73\u770b\u4e66\u6a21\u5f0f\u65f6\u5019\u79fb\u6765\u79fb\u53bb\u7684\u7ffb\u9875\u6548\u679c\uff0c\u4e5f\u662f\u6b64\u7b97\u6cd5\uff1b\u5782\u76f4\u6a21\u5f0f\u65f6\u5019\u70b9\u51fb\u7ffb\u5c4f\u4e5f\u662f\u8be5\u7b97\u6cd5\u7b49\u7b49\u3002<\/p>\n<p>\u7528\u5f97\u975e\u5e38\u591a\uff0c\u56e0\u4e3a\u7b80\u5355\uff0c\u4e0d\u9700\u8981\u67e5\u8d44\u6599\u76f4\u63a5\u53ef\u4ee5\u5199\u51fa\u6765\uff0c\u53ea\u8981\u8bb0\u4f4f\u201c\u7b49\u6bd4\u4f8b\u9760\u8fd1\u201d\u8fd9\u4e2a\u8bcd\uff0c\u5c31\u4e0d\u4f1a\u5fd8\u8bb0\u8be5\u600e\u4e48\u5b9e\u73b0\uff0c\u6c38\u8fdc\u5fd8\u4e0d\u4e86\u7684\u521d\u604b\u5c31\u662f\u8fd9\u79cd\u611f\u89c9\u3002<\/p>\n<p><strong>\u66f4\u65b0\u4e8e2019-11-28<\/strong><\/p>\n<p>\u5b9e\u9645\u5f00\u53d1\u65f6\u5019\u6709\u65f6\u5019\u4e0d\u662f\u6eda\u52a8\u5230\u9876\u90e8\uff0c\u800c\u662f\u4efb\u610f\u4f4d\u7f6e\uff0c\u4e8e\u662f\u5bf9\u4e0a\u9762\u65b9\u6cd5\u6539\u9020\u4e86\u4e0b\uff1a<\/p>\n<pre><span style=\"color:green;\">\/\/ \u6eda\u52a8\u5230\u9876\u90e8\u7f13\u52a8\u5b9e\u73b0<\/span>\r\n<span style=\"color:green;\">\/\/ rate\u8868\u793a\u7f13\u52a8\u901f\u7387\uff0c\u9ed8\u8ba4\u662f2<\/span>\r\nwindow.scrollTopTo = function (top, callback) {\r\n    var scrollTop = document.scrollingElement.scrollTop;\r\n    var rate = 2;\r\n\r\n    var funTop = function () {\r\n        scrollTop = scrollTop + (top - scrollTop) \/ rate;\r\n\r\n        <span style=\"color:green;\">\/\/ \u4e34\u754c\u5224\u65ad\uff0c\u7ec8\u6b62\u52a8\u753b<\/span>\r\n        if (Math.abs(scrollTop - top) &lt;= 1) {\r\n            document.scrollingElement.scrollTop = top;\r\n            callback &amp;&amp; callback();\r\n            return;\r\n        }\r\n        document.scrollingElement.scrollTop = scrollTop;\r\n        <span style=\"color:green;\">\/\/ \u52a8\u753bgogogo!<\/span>\r\n        requestAnimationFrame(funTop);\r\n    };\r\n    funTop();\r\n};<\/pre>\n<p>\u5176\u4e2d\uff1a<\/p>\n<dl>\n<dt><strong>top<\/strong><\/dt>\n<dd>\u5fc5\u9700\u3002Number\u3002\u5782\u76f4\u65b9\u5411\u5e0c\u671b\u6eda\u52a8\u7684\u4f4d\u7f6e\u3002<\/dd>\n<dt><strong>callback<\/strong><\/dt>\n<dd>\u5fc5\u9700\u3002Function\u3002\u6eda\u52a8\u5230\u6307\u5b9a\u4f4d\u7f6e\u65f6\u5019\u7684\u56de\u8c03\u65b9\u6cd5\u3002<\/dd>\n<\/dl>\n<p>\u6eda\u52a8\u901f\u7387\u5185\u7f6e\u4e86\uff0c\u662f<code>2<\/code>\uff0c\u56e0\u4e3a\u5b9e\u9645\u5f00\u53d1\u901f\u7387\u8c03\u6574\u5e76\u4e0d\u5e38\u7528\u3002<\/p>\n<p>\u603b\u4e4b\uff0c\u7ecf\u8fc7\u6539\u9020\u540e\uff0c\u6eda\u52a8\u5230\u9876\u90e8\u7684\u8fd9\u4e2a\u65b9\u6cd5\u53d8\u5f97\u5b9e\u7528\u591a\u4e86\u3002<\/p>\n<h3>\u4e09\u3001\u5373\u63d2\u5373\u7528\u7684\u7f13\u52a8\u5c0f\u7b97\u6cd5\u53d8\u8eab<\/h3>\n<p>\u5982\u679c\u9879\u76ee\u5f88\u591a\u5730\u65b9\u4f7f\u7528\u8be5\u7b97\u6cd5\uff0c\u6bcf\u6b21\u90fd\u5199\u4e00\u904d<code>requestAnimationFrame<\/code>\u548c\u8fb9\u754c\u5224\u65ad\u662f\u5f88\u5570\u55e6\u7684\uff0c\u4e8e\u662f\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u7b97\u6cd5\u53d8\u4e2a\u8eab\uff0c\u4f8b\u5982\u4e0b\u9762\u8fd9\u6837\uff1a<\/p>\n<pre>Math.easeout = function (A, B, rate, callback) {\r\n    if (A == B || typeof A != 'number') {\r\n        return;    \r\n    }\r\n    B = B || 0;\r\n    rate = rate || 2;\r\n    \r\n    var step = function () {\r\n        A = A + (B - A) \/ rate;\r\n        \r\n        if (A &lt; 1) {\r\n            callback(B, true);\r\n            return;\r\n        }\r\n        callback(A, false);\r\n        requestAnimationFrame(step);    \r\n    };\r\n    step();\r\n};<\/pre>\n<p>\u5176\u4e2d\uff1a<\/p>\n<ul>\n<li><code>A<\/code>\u662f\u8d77\u59cb\u4f4d\u7f6e\uff1b<\/li>\n<li><code>B<\/code>\u662f\u76ee\u6807\u4f4d\u7f6e\uff1b<\/li>\n<li><code>rate<\/code>\u662f\u7f13\u52a8\u901f\u7387\uff1b<\/li>\n<li><code>callback<\/code>\u662f\u53d8\u5316\u7684\u4f4d\u7f6e\u56de\u8c03\uff0c\u652f\u6301\u4e24\u4e2a\u53c2\u6570\uff0c<code>value<\/code>\u548c<code>isEnding<\/code>\uff0c\u8868\u793a\u5f53\u524d\u7684\u4f4d\u7f6e\u503c\uff08\u6570\u503c\uff09\u4ee5\u53ca\u662f\u5426\u52a8\u753b\u7ed3\u675f\u4e86\uff08\u5e03\u5c14\u503c\uff09\uff1b<\/li>\n<\/ul>\n<p>\u4e8e\u662f\uff0c\u6211\u4eec\u7684\u8fd4\u56de\u9876\u90e8\u6548\u679c\u53ef\u4ee5\u8fd9\u4e48\u4f7f\u7528\uff1a<\/p>\n<pre>var doc = document.body.scrollTop? document.body : document.documentElement;\r\nMath.easeout(doc.scrollTop, 0, 4, function (value) {\r\n    doc.scrollTop = value;\r\n});<\/pre>\n<p><button id=\"btnEaseout\">\u70b9\u51fb\u6211\u6267\u884cMath.easeout\u8fd4\u56de\u9876\u90e8<\/button><\/p>\n<p><script src=\"\/study\/201701\/easeout.js\"><\/script><br \/>\n<script>document.getElementById('btnEaseout').onclick = function () { var doc = document.body.scrollTop? document.body : document.documentElement; Math.easeout(doc.scrollTop, 0, 4, function (value) { doc.scrollTop = value; }); };<\/script><\/p>\n<p>\u53ef\u4ee5\u770b\u5230\u6548\u679c\u662f\u4e00\u6837\u7684\u68d2\u68d2\u54d2\u3002<\/p>\n<p>\u66f4\u5173\u952e\u70b9\u662f\u6211\u4eec\u7684\u7b97\u6cd5\u53ef\u4ee5\u5168\u5c40\u65e0\u9650\u5236\u91cd\u590d\u5229\u7528\u5566\uff01<\/p>\n<h3>\u56db\u3001\u7ed3\u675f\u8bed<\/h3>\n<p>\u672c\u6587\u67093\u4e2a\u6309\u94ae\uff0c\u6bcf\u4e2a\u6309\u94ae\u70b9\u51fb\u90fd\u4f1a\u6709\u5e26\u7f13\u52a8\u7684\u8fd4\u56de\u9876\u90e8\u7684\u6548\u679c\uff0c\u5982\u679c\u60a8\u53d1\u73b0\u60a8\u7684\u6d4f\u89c8\u5668\u6309\u94ae\u70b9\u51fb\u6ca1\u6548\u679c\uff0c\u6216\u8005\u6ca1\u6309\u94ae\uff0c\u5219\u591a\u534a\u60a8\u8bbf\u95ee\u7684\u4e0d\u662f\u539f\u51fa\u5904\u3002<\/p>\n<p>\u6839\u636e\u6211\u81ea\u5df1\u7684\u731c\u6d4b\uff0c<a href=\"https:\/\/github.com\/zhangxinxu\/Tween\" target=\"_blank\">Tween.js\u6807\u51c6\u7684\u7f13\u52a8\u7b97\u6cd5<\/a>\u4e2d\uff0c\u5e94\u8be5\u6709\u7c7b\u4f3c\u672c\u6587\u7684\u5c0f\u7b97\u6cd5\u7684\uff0c\u5e94\u8be5\u5c31\u662f\u67d0\u4e2aeaseOut\u65b9\u6cd5\u3002\u4f46\u662f\uff0c\u5177\u4f53\u5b9e\u73b0\u4e0a\u8fd8\u662f\u4f1a\u6709\u4e00\u4e9b\u5dee\u5f02\u7684\uff0cTween.js\u662f\u57fa\u4e8e\u65f6\u95f4\u6765\u505a\u7b97\u6cd5\u7684\uff0c\u800c\u672c\u6587\u7684Math.easeout\u7b97\u6cd5\u662f\u57fa\u4e8e\u7f13\u52a8\u901f\u7387\u7684\uff0c\u6700\u7ec8\u7684\u65f6\u95f4\u662f\u4e0d\u56fa\u5b9a\u7684\uff0c\u53d7\u8d77\u59cb\u548c\u7ec8\u6b62\u4f4d\u7f6e\u7684\u8ddd\u79bb\u7684\u5f71\u54cd\uff0c\u4e5f\u6b63\u662f\u8fd9\u4e2a\u539f\u56e0\uff0c\u672c\u6587\u7684\u7f13\u52a8\u52a8\u753b\u7b97\u6cd5\u66f4\u597d\u7406\u89e3\u66f4\u5bb9\u6613\u8bb0\u5fc6\uff0c\u56e0\u4e3a\u73b0\u5b9e\u4e16\u754c\u8ddd\u79bb\u662f\u771f\u5b9e\u7684\u5bb9\u6613\u611f\u77e5\u7684\uff0c\u65f6\u95f4\u662f\u865a\u5e7b\u7684\u65e0\u6cd5\u6355\u6349\u7684\uff0c\u6b63\u597d\u548c\u672c\u6587\u7684\u7b97\u6cd5\u8ddd\u79bb\u9a71\u52a8\u800c\u975e\u65f6\u95f4\u9a71\u52a8\u76f8\u6620\u5c04\uff0c\u5bb9\u6613\u5f62\u6210\u5171\u8bc6\u3002<\/p>\n<p>\u6069\uff0c\u5c31\u8bf4\u8fd9\u4e48\u591a\u5427\u3002<\/p>\n<p>\u611f\u8c22\u9605\u8bfb\uff0c\u6b22\u8fce\u4ea4\u6d41\uff0c\u66f4\u6b22\u8fce\u5927\u529b\u5206\u4eab\uff0c\u4f60\u77a7\uff0c\u6211\u628a\u73cd\u85cf\u7684\u521d\u604b\u90fd\u5206\u4eab\u51fa\u6765\u4e86\uff0c\u8fd8\u4e0d\u70b9\u8d5e\u5206\u4eab\u652f\u6301\u4e0b\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/mat1.gtimg.com\/www\/mb\/images\/face\/13.gif\" align=\"absmiddle\"><\/p>\n<p>\u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\uff0c\u5305\u542b\u811a\u672c\u884c\u4e3a\uff0c\u4f1a\u7ecf\u5e38\u66f4\u65b0\u77e5\u8bc6\u70b9\u4ee5\u53ca\u4fee\u6b63\u4e00\u4e9b\u9519\u8bef\uff0c\u56e0\u6b64\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u539f\u51fa\u5904\uff0c\u65b9\u4fbf\u6eaf\u6e90\uff0c\u907f\u514d\u9648\u65e7\u9519\u8bef\u77e5\u8bc6\u7684\u8bef\u5bfc\uff0c\u540c\u65f6\u6709\u66f4\u597d\u7684\u9605\u8bfb\u4f53\u9a8c\u3002<br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=5875\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=5875<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u2026\u2026\u5b9e\u9645\u5f00\u53d1\u7684\u65f6\u5019\uff0c\u4f7f\u7528\u7684\u6700\u591a\u7684\u8fd8\u662f\u6700\u521d\u7684\u90a3\u4e2a\u5979\uff0c\u4e0d\u4ec5\u662f\u56e0\u4e3a\u5979\u7ed9\u6211\u5e26\u6765\u4e86\u5f88\u591a\u7f8e\u597d\u7684\u56de\u5fc6\uff0c\u66f4\u91cd\u8981\u7684\u662f\u8fd9\u4e48\u591a\u5e74\u8fc7\u53bb\u4e86\uff0c\u5979\u4e00\u76f4\u4fdd\u6301\u7740\u90a3\u4efd\u7b80\u5355\uff0c\u548c\u5916\u9762\u7684\u90a3\u4e9b\u5996\u8273*\u8d27\u5b8c\u5168\u4e0d\u4e00\u6837\u3002<\/p>\n<p>\u800c\u8fd9\u4e2a\u76f8\u4f34\u81ea\u5df1\u6700\u4e45\uff0c\u6700\u65e0\u6cd5\u5fd8\u6000\u7684\u3001\u4f7f\u7528\u6700\u591a\u7684\u5979\u5c31\u662f\u672c\u6587\u8981\u5206\u4eab\u7684\u79c1\u85cf\u7684\u52a8\u753b\u5c0f\u7b97\u6cd5\u2026\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[180],"tags":[1523,1095,204,1524,1096,129,585],"_links":{"self":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/5875"}],"collection":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/comments?post=5875"}],"version-history":[{"count":0,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/5875\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/media?parent=5875"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/categories?post=5875"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/tags?post=5875"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}