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//获取元素的水平位置函数
function pageX(elem){
return elem.offsetParent ? elem.offsetLeft + pageX(elem.offsetParent) : elem.offsetLeft;
}
document.getElementById("div").style.position = "absolute";
document.getElementById("div").style.zIndex = 999;
document.getElementById("div").offsetLeft = "100px";
document.getElementById("div").offsetTop = "100px";
or
document.getElementById("div").style.left = "100px";
document.getElementById("div").style.top = "100px";
document.getElementById("div").offsetLeft
document.getElementById("div").offsetTop