js 返回DIV左上角坐标距视窗口的距离

比较简单的一种写法：

var top= document.getElementById("#id").getBoundingClientRect().top;

function getElementLeft(element){

var actualLeft = element.offsetLeft;

var current = element.offsetParent;

while (current !== null){

actualLeft += current.offsetLeft;

current = current.offsetParent;

}

return actualLeft;

}

function getElementTop(element){

var actualTop = element.offsetTop;

var current = element.offsetParent;

while (current !== null){

actualTop += current. offsetTop;

current = current.offsetParent;

}

return actualTop;

}