不明白elem.offsetParent.offsetTop+elem.offsetTop是哪部分的距离，求大神指点
function getOffsetTop(elem){
var offsetTop=elem.offsetTop;
while(elem.offsetParent){
elem=elem.offsetParent;
offsetTop+=elem.offsetTop;
}
return offsetTop;
}
慕运维6652247
2017-10-15
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