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javascript定位的问题

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javascript定位的问题

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定位是相对与html页面定位的
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这个就是正常。
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但是如果我把滚动条下拉，定位的位置就出错了，为什么？


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event.clientY是鼠标指针相对于浏览器页面的位置，position: absolute是元素相对于 static 定位以外的第一个父元素进行定位。两个不是一个世界的。你可以把position改为fixed，进行窗口定位


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