js 取元素相对页面的高度和宽度

function pos(elem) {
    var x = elem.offsetLeft,  y = elem.offsetTop;
    while (elem = elem.offsetParent) {
        x += elem.offsetLeft;
        y += elem.offsetTop;
    }
    return [x, y];
}

转载于:https://www.cnblogs.com/momofan/p/3441210.html