{"id":11620,"date":"2025-04-14T22:07:41","date_gmt":"2025-04-14T14:07:41","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=11620"},"modified":"2025-04-14T22:07:41","modified_gmt":"2025-04-14T14:07:41","slug":"dom-caretpositionfrompoint-api","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2025\/04\/dom-caretpositionfrompoint-api\/","title":{"rendered":"DOM\u65b0\u7279\u6027\u4e4bcaretPositionFromPoint API"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=11620\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=11620<\/a><br \/>\n\u672c\u6587\u53ef\u5168\u6587\u8f6c\u8f7d\uff0c\u72ec\u7acb\u57df\u540d\u4e2a\u4eba\u7f51\u7ad9\u65e0\u9700\u6388\u6743\uff0c\u4f46\u9700\u8981\u4fdd\u7559\u539f\u4f5c\u8005\u3001\u51fa\u5904\u4ee5\u53ca\u6587\u4e2d\u94fe\u63a5\uff0c\u4efb\u4f55\u7f51\u7ad9\u5747\u53ef\u6458\u8981\u805a\u5408\uff0c\u5546\u7528\u8bf7\u8054\u7cfb\u6388\u6743\u3002<\/p>\n<p><script>window.wxShareImgUrl = 'https:\/\/www.zhangxinxu.com\/study\/image\/share\/201901-css-var.jpg';<\/script><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202308\/nonce-popover-cover.png\" width=\"480\" height=\"309\" alt=\"\u5c01\u9762\u56fe\uff0c\u5c0f\u9e7f\u770b\u9e1f\" class=\"alignright clip thumb size-medium\" loading=\"lazy\"><\/p>\n<h3>\u4e00\u3001caretPositionFromPoint\u7279\u6027\u7684\u8bed\u6cd5\u548c\u4f5c\u7528<\/h3>\n<p><code>caretPositionFromPoint<\/code>\u662f\u6d4f\u89c8\u5668\u652f\u6301\u4e0d\u4e45\u7684\u4e00\u4e2a\u65b0\u7279\u6027\uff0c\u53ef\u4ee5\u57fa\u4e8e\u5f53\u524d\u7684\u5149\u6807\u4f4d\u7f6e\uff0c\u8fd4\u56de\u5149\u6807\u6240\u5bf9\u5e94\u5143\u7d20\u7684\u4f4d\u7f6e\u4fe1\u606f\uff0c\u5728\u4e4b\u524d\uff0c\u6b64\u7279\u6027\u4f7f\u7528\u7684\u662f\u975e\u6807\u51c6\u7684<code>document.caretRangeFromPoint()<\/code>\u65b9\u6cd5\u5b9e\u73b0\u7684\u3002<\/p>\n<p><code>caretPositionFromPoint()<\/code>\u65b9\u6cd5\u548c<code>elementsFromPoint()<\/code>\u65b9\u6cd5\u7684\u533a\u522b\u5728\u4e8e\uff0c\u524d\u8005\u8fd4\u56de\u8282\u70b9\u53ca\u5176\u504f\u79fb\u3001\u5c3a\u5bf8\u7b49\u4fe1\u606f\uff0c\u800c\u540e\u8005\u8fd4\u56de\u5143\u7d20\u3002<\/p>\n<p>\u6bd4\u65b9\u8bf4\u6709\u4e00\u6bb5<code>&lt;p&gt;<\/code>\u5143\u7d20\u6587\u5b57\u63cf\u8ff0\u4fe1\u606f\uff0c\u70b9\u51fb\u8fd9\u6bb5\u63cf\u8ff0\u7684\u67d0\u4e2a\u6587\u5b57\uff0c<code>caretPositionFromPoint()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u8fd4\u56de\u7cbe\u786e\u7684\u6587\u672c\u8282\u70b9\u4ee5\u53ca\u70b9\u51fb\u4f4d\u7f6e\u7684\u5b57\u7b26\u504f\u79fb\u503c\uff0c\u800c<code>elementsFromPoint()<\/code>\u65b9\u6cd5\u53ea\u80fd\u8fd4\u56de\u5f53\u524d<code>&lt;p&gt;<\/code>\u5143\u7d20\u3002<\/p>\n<h4>\u4f5c\u7528<\/h4>\n<p><code>caretPositionFromPoint()<\/code>\u7684\u4f5c\u7528\u573a\u666f\u6bd4\u8f83\u5c0f\u4f17\uff0c\u4e00\u822c\u7528\u5728\u5206\u8bcd\u5206\u53e5\u8fd9\u79cd\u4ea4\u4e92\u573a\u666f\u4e2d\u3002<\/p>\n<p>\u4f8b\u5982\u5236\u4f5c\u89c6\u9891\u5c01\u9762\u7684\u65f6\u5019\uff0c\u4e66\u5c01\u6807\u9898\u7684\u6587\u5b57\u9700\u8981\u4e2d\u65ad\uff0c\u6b64\u65f6\uff0c\u5c31\u53ef\u4ee5\u76f4\u63a5\u70b9\u51fb\u5b9e\u73b0\u3002<\/p>\n<h4>\u8bed\u6cd5<\/h4>\n<p>\u8bed\u6cd5\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>const range = document.caretPositionFromPoint(x, y, options);<\/pre>\n<p>\u5176\u4e2d\uff1a<\/p>\n<ul>\n<li>x, y\u5c31\u662f\u76f8\u5bf9\u4e8e\u6d4f\u89c8\u5668\u7a97\u53e3\u5de6\u4e0a\u89d2\u7684\u5750\u6807\u503c\u3002<\/li>\n<li>options\u662f\u4e00\u4e2a\u53ef\u9009\u53c2\u6570\uff0c\u652f\u6301\u4e00\u4e2a\u540d\u4e3ashadowRoots\u7684\u5c5e\u6027\uff0c\u5176\u503c\u4e3a\u4e00\u4e2aShadowRoot\u5bf9\u8c61\u6570\u7ec4\u3002\u8be5\u65b9\u6cd5\u53ef\u4ee5\u8fd4\u56de\u5728shadow DOM\u4e2d\u5b9a\u4e49\u7684\u8282\u70b9\u7684\u63d2\u5165\u7b26\u53f7\u4f4d\u7f6e\u3002\u5982\u679c\u4e0d\u8bbe\u7f6e\uff0c\u8fd4\u56de\u7684\u4f1a\u662fshadow DOM\u6839\u5143\u7d20\u3002<\/li>\n<\/ul>\n<h3>\u4e8c\u3001caretPositionFromPoint\u4f7f\u7528\u6848\u4f8b<\/h3>\n<p>\u8fd9\u91cc\u901a\u8fc7\u4e00\u4e2a\u4e66\u5c01\u4e66\u540d\u4e2d\u65ad\u7b80\u5355\u793a\u610f\u4e0b<code>caretPositionFromPoint()<\/code>\u65b9\u6cd5\u7684\u4f7f\u7528\u3002<\/p>\n<p>\u5df2\u77e5\u67d0\u4e66\u5c01HTML\u7ed3\u6784\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>&lt;figure&gt;\r\n    &lt;img src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202308\/nonce-popover-cover.png\"&gt;\r\n    &lt;figcaption&gt;\u6211\u662f\u4e66\u540d\u70b9\u6211\u65ad\u53e5&lt;\/figcaption&gt;\r\n&lt;\/figure&gt;<\/pre>\n<p>\u7136\u540efigcaption\u8bbe\u7f6e\u5141\u8bb8\u6362\u884c\u7b26\u6362\u884c\u6548\u679c\uff1a<\/p>\n<pre>figcaption {\r\n    white-space: pre-wrap;\r\n}<\/pre>\n<p>\u5219\u4e0b\u9762\u7684\u4ee3\u7801\u53ef\u4ee5\u5b9e\u73b0\u70b9\u51fbfigcaption\u5143\u7d20\uff0c\u81ea\u52a8\u4e2d\u65ad\uff1a<\/p>\n<pre>\/\/ \u4e2d\u65ad\u65b9\u6cd5\r\nfigcaption.addEventListener('click', function (event) {\r\n    const { clientX, clientY } = event;\r\n    let range;\r\n    let textNode;\r\n    let offset;\r\n\r\n    if (document.caretPositionFromPoint) {\r\n        range = document.caretPositionFromPoint(clientX, clientY);\r\n        textNode = range.offsetNode;\r\n        offset = range.offset;\r\n    } else if (document.caretRangeFromPoint) {\r\n        \/\/ \u4f7f\u7528\u975e\u6807\u51c6\u7684\u8001\u7684API\u4ee3\u66ff\r\n        range = document.caretRangeFromPoint(clientX, clientY);\r\n        textNode = range.startContainer;\r\n        offset = range.startOffset;\r\n    } else {\r\n        return;\r\n    }\r\n    \r\n    \/\/ \u6587\u672c\u8282\u70b9\u5728\u5f53\u524d\u504f\u79fb\u4f4d\u7f6e\u5206\u9694\uff0c\u8fd4\u56de\u7684\u662f\u540e\u9762\u7684\u8282\u70b9\r\n    const replacement = textNode.splitText(offset);\r\n    const brNode = document.createTextNode('\\n');\r\n    replacement.before(brNode);\r\n});<\/pre>\n<p>\u773c\u89c1\u4e3a\u5b9e\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202504\/js-caretpositionfrompoint-break-word-demo.php\" rel=\"noopener\" target=\"_blank\">caretPositionFromPoint\u4e66\u540d\u624b\u52a8\u6362\u884cdemo<\/a><\/p>\n<p>\u6700\u7ec8\u5b9e\u73b0\u7684\u6548\u679c\u5982\u4e0bGIF\u6240\u793a\uff0c\u70b9\u51fb\u54ea\u91cc\u7684\u6587\u5b57\uff0c\u6587\u5b57\u5c31\u5728\u54ea\u91cc\u6362\u884c\u4e86\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202504\/word-break.gif\" width=\"240\" height=\"306\" alt=\"\u70b9\u51fb\u6587\u5b57\u65ad\u884cGIF\u793a\u610f\u56fe\" class=\"alignnone size-medium\" \/><\/p>\n<h3>\u4e09\u3001\u517c\u5bb9\u6027\u3001\u70b9\u8bc4\u4e0e\u7ed3\u8bed<\/h3>\n<p><code>caretPositionFromPoint<\/code>\u7684\u517c\u5bb9\u6027\u5982\u4e0b\u622a\u56fe\u6240\u793a\uff0cChrome 128\u7248\u672c\u5f00\u59cb\u652f\u6301\u7684\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202504\/2025-4-14_150259.png\" width=\"645\" height=\"323\" alt=\"caretPositionFromPoint\u517c\u5bb9\u6027\" class=\"alignnone size-medium\" \/><\/p>\n<p>Safari\u6d4f\u89c8\u5668\u76ee\u524d\u8fd8\u4e0d\u652f\u6301\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<code>caretRangeFromPoint<\/code>\u4ee3\u66ff\uff0c\u8fd9\u4e2a\u7279\u6027\u652f\u6301\u5f88\u4e45\u4e86\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202504\/2025-4-14_150413.png\" width=\"644\" height=\"316\" alt=\"caretRangeFromPoint\u517c\u5bb9\u6027\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u5177\u4f53\u5982\u4f55\u4f7f\u7528\uff0c\u53ef\u53c2\u89c1\u4e0a\u9762\u7684\u6f14\u793a\u9875\u9762\u6e90\u7801\u3002<\/p>\n<h4>\u70b9\u8bc4<\/h4>\n<p>\u8fd4\u56de\u7279\u5b9a\u5750\u6807\u7684\u8282\u70b9\u548c\u9009\u533a\u504f\u79fb\u53ef\u4ee5\u8ba9\u6211\u4eec\u7cbe\u786e\u77e5\u9053\u5f53\u524d\u5750\u6807\u7684\u6587\u5b57\u5185\u5bb9\u662f\u4ec0\u4e48\uff0c\u53c8\u4e00\u5b9a\u7684\u5b9e\u7528\u4ef7\u503c\u3002<\/p>\n<p>\u4f46\u6211\u4eec\u65e5\u5e38\u5f00\u53d1\u5f88\u5c11\u9047\u5230\u76f8\u5173\u7684\u9700\u6c42\uff0c\u56e0\u6b64\uff0c\u6211\u5efa\u8bae\u5927\u5bb6\u4e86\u89e3\u4e0b\u8fd9\u4e2a\u5c5e\u6027\u5373\u53ef\uff0c\u77e5\u9053Web\u6709\u8fd9\u4e48\u4e00\u4e2a\u80fd\u529b\uff0c\u5f53\u6211\u4eec\u9047\u5230\u76f8\u5173\u573a\u666f\u7684\u65f6\u5019\uff0c\u77e5\u9053\u6709\u8fd9\u4e48\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u89e3\u51b3\u5373\u53ef\u3002<\/p>\n<p>OK\uff0c\u5c31\u8bf4\u8fd9\u4e48\u591a\u3002<\/p>\n<p>\u611f\u8c22\u5927\u5bb6\u7684\u9605\u8bfb\uff0c\u6211\u4eec\u4e0b\u4e00\u7bc7\u6587\u7ae0\u518d\u89c1\uff0c\u8fd8\u662f\u4ecb\u7ecd\u65b0\u7279\u6027\u7684\u3002<\/p>\n<p>\ud83d\udc4b\ud83c\udffb\ud83d\udc4b\ud83c\udffb\ud83d\udc4b\ud83c\udffb<\/p>\n<p>\u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\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=11620\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=11620<\/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\/202308\/nonce-popover-cover.png\" width=\"160\" height=\"103\" alt=\"\u5c01\u9762\u56fe\uff0c\u5c0f\u9e7f\u770b\u9e1f\" class=\"alignright size-medium\" loading=\"lazy\"><\/p>\n<p>DOM caretPositionFromPoint  API\u53ef\u4ee5\u57fa\u4e8e\u4f4d\u7f6e\u8bbf\u95ee\u5339\u914d\u7684\u8282\u70b9\u5143\u7d20\u548c\u6587\u672c\u504f\u79fb\uff0c\u636e\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u66f4\u52a0\u7cbe\u786e\u7684\u6587\u672c\u64cd\u4f5c\u4ea4\u4e92\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1284],"tags":[215,2047,2048,1211,1852,587],"_links":{"self":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/11620"}],"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=11620"}],"version-history":[{"count":6,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/11620\/revisions"}],"predecessor-version":[{"id":11671,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/11620\/revisions\/11671"}],"wp:attachment":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/media?parent=11620"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/categories?post=11620"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/tags?post=11620"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}