{"id":7351,"date":"2018-02-02T01:08:56","date_gmt":"2018-02-01T17:08:56","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=7351"},"modified":"2018-02-02T01:15:11","modified_gmt":"2018-02-01T17:15:11","slug":"container-scroll-position-hold","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2018\/02\/container-scroll-position-hold\/","title":{"rendered":"\u5c0ftips: \u6eda\u52a8\u5bb9\u5668\u5c3a\u5bf8\u53d8\u5316\u5b50\u5143\u7d20\u89c6\u89c9\u4e0a\u4f4d\u7f6e\u4e0d\u53d8JS\u5b9e\u73b0"},"content":{"rendered":"

by zhangxinxu<\/a> from http:\/\/www.zhangxinxu.com\/wordpress\/?p=7351<\/a>
\n\u672c\u6587\u53ef\u5168\u6587\u8f6c\u8f7d\uff0c\u4f46\u9700\u8981\u4fdd\u7559\u539f\u4f5c\u8005\u548c\u51fa\u5904\u3002<\/p>\n

\u4e00\u3001\u5148\u4ece\u9700\u6c42\u8bf4\u8d77<\/h3>\n

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\u6eda\u52a8\u5bb9\u5668\u5230\u5408\u9002\u4f4d\u7f6e\uff0c\u7136\u540e\u6539\u53d8\u6d4f\u89c8\u5668\u7a97\u53e3\u5c3a\u5bf8\uff0c\u53ef\u4ee5\u4f53\u9a8c\u5230\u5fae\u4e1d\u4e0d\u52a8\u7684\u975e\u5e38\u53cb\u597d\u7684\u4ea4\u4e92\u4f53\u9a8c\u6548\u679c\u3002<\/p>\n

JS\u5b9e\u73b0\u7684\u539f\u7406<\/h4>\n
    \n
  1. \u83b7\u5f97\u6700\u9760\u8fd1\u6eda\u52a8\u5bb9\u5668\u4e0a\u8fb9\u7f18\u7684\u5143\u7d20\uff1b<\/li>\n
  2. \u83b7\u5f97\u6700\u9760\u8fd1\u6eda\u52a8\u5bb9\u5668\u4e0a\u8fb9\u7f18\u7684\u5143\u7d20\u8ddd\u79bb\u4e0a\u8fb9\u7f18\u7684\u8ddd\u79bb\uff1b<\/li>\n
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    \u6211\u8fd9\u91cc\u4f7f\u7528\u7684\u662fdocument.elementsFromPoint<\/code>\u65b9\u6cd5\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

    var elements = document.elementsFromPoint(x, y);<\/pre>\n
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    var box = document.getElementById('box');\n\n\/\/ x\u5c31\u53d6\u6eda\u52a8\u5bb9\u5668\u6c34\u5e73\u4e2d\u5fc3\u70b9<\/span>\nvar x = box.getBoundingClientRect().left + box.clientWidth \/ 2;\n\/\/ + 12\u4e3a\u4e86\u8ba9\u66f4\u9760\u4e0b\u4e00\u70b9\u7684\u5143\u7d20\u4f5c\u4e3a\u8fb9\u7f18\u5143\u7d20<\/span>\nvar y = box.getBoundingClientRect().top + 12;\n\/\/ target\u5c31\u662f\u6211\u4eec\u83b7\u53d6\u7684\u6700\u63a5\u8fd1\u6eda\u52a8\u5bb9\u5668\u4e0a\u8fb9\u7f18\u7684\u5143\u7d20<\/span>\nvar target = document.elementsFromPoint(x, y)[0];<\/pre>\n
    \u7136\u540etarget<\/code>\u8ddd\u79bb\u4e0a\u8fb9\u7f18\u7684\u8ddd\u79bb\u4e5f\u5f88\u597d\u5b9e\u73b0\uff08\u5bb9\u5668scroll<\/code>\u4e8b\u4ef6\u65f6\u5019\u6267\u884c\uff09\uff1a<\/p>\n
    var offsetTop = target.getBoundingClientRect().top - box.getBoundingClientRect().top<\/pre>\n
    \u6700\u540e\uff0c\u6839\u636e\u6eda\u52a8\u540e\u7684\u8fb9\u7f18\u8ddd\u79bb\u8fdb\u884c\u6eda\u52a8\u4fee\u6b63\uff08\u7a97\u4f53resize<\/code>\u4e8b\u4ef6\u65f6\u5019\u6267\u884c\uff09\uff1a<\/p>\n
    var currentOffsetTop = box.getBoundingClientRect().top - target.getBoundingClientRect().top;\n\/\/ \u6eda\u52a8\u4fee\u6b63\uff0c\u6548\u679c\u8fbe\u6210<\/span>\nbox.scrollTop = box.scrollTop - currentOffsetTop - offsetTop;<\/pre>\n
    \u66f4\u5b8c\u6574JS\u4ee3\u7801\u53c2\u89c1demo\u9875\u9762<\/a>\uff08\u5c31\u51e0\u5341\u884c\uff09\uff0c\u5927\u5bb6\u53ef\u4ee5\u6839\u636e\u81ea\u5df1\u5b9e\u9645\u9879\u76ee\u573a\u666f\u8fdb\u884c\u4fee\u6539\uff0c\u8fd9\u91cc\u4e0d\u91cd\u590d\u5c55\u793a\u3002<\/p>\n
    \u5173\u4e8edocument.elementsFromPoint API\u7684\u517c\u5bb9\u6027<\/h4>\n
    \u6839\u636eMDN<\/a>\u4e0a\u7684\u6570\u636e\uff0cdocument.elementsFromPoint<\/code> IE10+\u624d\u652f\u6301\uff0c\u800c\u4e14\u9700\u8981ms<\/code>\u79c1\u6709\u524d\u7f00\uff0c\u56e0\u6b64\uff0c\u5982\u679c\u60f3\u8981\u517c\u5bb9IE\u6d4f\u89c8\u5668\uff0c\u53ef\u4ee5\u52a0\u4e00\u53e5\uff1a<\/p>\n
    if (!document.elementsFromPoint) {\n    document.elementsFromPoint = document.msElementsFromPoint;\n}<\/pre>\n
    \u7531\u4e8e\u672c\u6587\u5b9e\u4f8b\u5c5e\u4e8e\u4f53\u9a8c\u589e\u5f3a\u7684\u529f\u80fd\uff0c\u56e0\u6b64\uff0c\u5c31\u7b97\u6d4f\u89c8\u5668\u4e0d\u652f\u6301\u4e5f\u65e0\u4f24\u5927\u96c5\uff0c\u80fd\u591f\u8ba990+%\u6d4f\u89c8\u5668\u6709\u66f4\u597d\u4f53\u9a8c\u5df2\u7ecf\u5f88\u68d2\u4e86\uff0c\u56e0\u6b64\u662f\u53ef\u4ee5\u653e\u5fc3\u5927\u80c6\u4f7f\u7528\u7684\u4e00\u4e2a\u6280\u672f\u6848\u4f8b\u3002<\/p>\n
    IE\u6d4f\u89c8\u5668\u4e0b\u66f4\u591a\u7ec6\u8282<\/h4>\n
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    var currentOffsetTop = Math.round(box.getBoundingClientRect().top) - Math.round(target.getBoundingClientRect().top);<\/pre>\n
    \u4f53\u9a8c\u679c\u7136\u597d\u4e86\u5f88\u591a\u3002<\/p>\n
    \u53e6\u5916\uff0c\u5728Chrome\u7b49\u6d4f\u89c8\u5668\u4e0b\uff0ctarget<\/code>\u7684\u83b7\u53d6\u548c\u504f\u79fb\u8ba1\u7b97\u53ef\u4ee5\u76f4\u63a5\u5728window<\/code> resize<\/code>\u65f6\u5019\u6267\u884c\u3002\u4f46\u662fIE\u6d4f\u89c8\u5668\u4e0d\u884c\uff0c\u4f3c\u4e4eIE\u6d4f\u89c8\u5668\u5148\u89e6\u53d1\u6d4f\u89c8\u5668\u884c\u4e3a\uff0c\u518d\u6267\u884c\u4e86resize<\/code>\u4e8b\u4ef6\uff0c\u6240\u4ee5\uff0c\u7efc\u5408\u4e0b\u6765\uff0c\u8fd8\u662f\u5efa\u8bae\u6700\u4e0a\u8fb9\u7f18\u5143\u7d20\u83b7\u53d6\u653e\u5728scroll<\/code>\u4e8b\u4ef6\u4e2d\u5904\u7406\u3002<\/p>\n
    \u4e09\u3001\u7ed3\u675f\u8bed<\/h3>\n
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    <\/p>\n
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    \uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"
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