从attachEvent获取事件的调用者 [英] Get the caller of the event from attachEvent

问题描述

我正在尝试做一些简单的事情：我有一堆正在通过JS加载的图像。
我将一个事件监听器附加到load事件，并且在加载Image之后，在监听器函数中我想从中获取调用Image和检索属性。
这是我的代码，简化：

I am trying to do something simple: I have a bunch of Images which are being load through JS. I attach an event listener to the load event, and after the Image is being loaded, in the listener function I would like to get the calling Image and retrieve properties from it. Here is my code, simplified:

function loadImages() {
   for (var i = 0; i < arrDownloadQueueBasic.length; i++) {
                var path = arrDownloadQueueBasic[i].path;

                var img = new Image();
                img.type = arrDownloadQueueBasic[i].type;
                img.attachEvent(img, 'load', setBasicElement);
                img.src = path;
            }
   }

function setBasicElement(e) {
        var caller = e.target || e.srcElement;
        alert(caller); // THIS DOESNT WORK - RETURN NULL
        alert(caller.type) // OF COURSE THIS DOESNT WORK AS WELL...
    }

推荐答案

试试这个：

var caller = window.event ? window.event.srcElement : e.target;

如果我没记错，当你使用 attachEvent（），但它有一个全局事件对象。

If I remember rightly IE doesn't pass the event object as a parameter when you've used attachEvent(), but it has a global event object.

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