Firefox 中的 window.event 替代方案 [英] window.event alternative in Firefox

问题描述

我发现 window.event 或 event 在 Firefox 中不起作用，所以我需要替代方案.我不想设置任何 HTML 属性，只是 Javascript.我在这个函数中，我想从这里获取鼠标坐标:

I see that window.event or event does not work in Firefox, so I need alternative for this. I don't want to set ANY HTML attributes, just Javascript. I'm within this function and I want to get mouse coordinates from here:

document.onmouseover = function(){
    var mouseX = event.clientX;
    var mouseY = event.clientY;
}

显然这在 Firefox 中不起作用，所以我想知道如何去做.

Obviously this won't work in firefox, so I want to know how to do it.

推荐答案

这是典型的方法，您可以在随处可见的示例中找到.

This is the typical approach that you'll find in examples everywhere.

document.onmouseover = function(event) {
    event = event || window.event;

    var mouseX = event.clientX;
    var mouseY = event.clientY;
}

检索 event 对象的 W3C 标准方法是通过第一个函数参数.较旧的 IE 不支持这种方法，因此 event 将是 undefined.在这种情况下，|| 运算符让我们可以获取 window.event 对象.

The W3C standard way of retrieving the event object is via the first function parameter. Older IE didn't support that approach, so event will be undefined. The || operator lets us fetch the window.event object in that case.

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