获取最底层iframe页面中鼠标点击的坐标

多层iframe嵌套的时候，取最底层iframe页面鼠标点击的XY坐标，

IE下测试通过~

 

/**
 * 获取最底层iframe页面中鼠标点击的位置
 */
function getPosition_Iframe(){
	var parentWindow = window.parent;
	var tmpLocation = window.location;
	var target = null;
	var left=0;
	var top=0;
	while(parentWindow!=null && typeof(parentWindow)!='undefined' && tmpLocation!=parentWindow.location){
		for(var x=0;x< parentWindow.frames.length;x++){
			if(tmpLocation == parentWindow.frames[x].location){
				target = parentWindow.frames[x].frameElement;
				break;
			}
		}
		do {
			left += target.offsetLeft - target.scrollLeft|| 0;
			top += target.offsetTop - target.scrollTop || 0;
			target = target.offsetParent;
		 } while(target);
		tmpLocation=parentWindow.location;
		parentWindow = parentWindow.parent;
	}
	return {x:left+window.event.clientX,y:top+window.event.clientY};
}