精确获取offsetTop

目的：精确获取offsetTop，解决H5滚动监听的时候，获取的offsetTop有问题，解决安卓和IOS上的表现不一致

先简单写个demo，学习一下基础的知识

    

    

    

    

    





    

    


        


        div1

    

    


        div3

    

    

下面是大招

function getOffsetTop () {

    let actualTop = element.offsetTop;

    let current = element.offsetParent;

    while (current !== null) {

        actualTop += current.offsetTop;

        current = current.offsetParent;

    }

    return actualTop;

}