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function getRect(element) {
var rect = element.getBoundingClientRect();
var top = document.documentElement.clientTop;
var left = document.documentElement.clientLeft;
return {
top : rect.top - top,
bottom : rect.bottom - top,
left : rect.left - left,
right : rect.right - left
}
}
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原文地址:http://www.cnblogs.com/fangxuele/p/5430741.html