var a;
var d=0;
function move(e){ // firefox chrome 事件回调参数为 Event
if(window.attachEvent){
e=window.event; // IE 事件对象
e.target=e.srcElement;
e.target=e.target?e.target:window;
e.currentTarget=e.toElement;
}
alert(e.target.tagName);
}
document.onmousedown=move;
