getTop (e) { var offset=e.offsetTop; if(e.offsetParent!=null) offset+=this.getTop(e.offsetParent); return offset; },
getTop (e) { var offset=e.offsetTop; if(e.offsetParent!=null) offset+=this.getTop(e.offsetParent); return offset; },
原文：https://www.cnblogs.com/CyLee/p/8678240.html