javascript 在内联事件处理程序中传递事件数据
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Passing event data in the inline event handlers
提问by rhino
I have an <input>which has an onkeydowninline event handler. In this handler, I'd like to call a function and pass a special parameter to it - the event data.
我有一个<input>它有一个onkeydown内嵌的事件处理程序。在这个处理程序中，我想调用一个函数并将一个特殊的参数传递给它 - 事件数据。
When I want to handle events (e.g. onmousemove) for the whole document, I use the following code:
当我想处理整个文档的事件（例如 onmousemove）时，我使用以下代码：
document.onmousemove=function(e) {
// here I can make a good use of the 'e' variable,
// for example extract the mouse coordinates from it
}
And it works (although I don't know where the evariable - event data - comes from).
But this time I want to use the function only for the <input>mentioned above.
I need to pass the event data to the function so it can get the pressed key's code. And I want to do it in that inline event handler. I've created a function:
它有效（虽然我不知道e变量 - 事件数据 - 来自哪里）。
但是这次我只想将这个功能用于<input>上面提到的。
我需要将事件数据传递给函数，以便它可以获取按下的键的代码。我想在那个内联事件处理程序中做到这一点。我创建了一个函数：
function myfunc (e) {
var evt=window.event?event:e;
var code=evt.keyCode;
alert (code);
}
and tried all of these methods:
并尝试了所有这些方法：
<input onkeydown="myfunc(this)">
<input onkeydown="myfunc(this)">
<input onkeydown="myfunc(this.onkeydown)">
<input onkeydown="myfunc(this.onkeydown)">
<input onkeydown="myfunc(onkeydown)">
<input onkeydown="myfunc(onkeydown)">
But none of them worked, the alert window kept displaying "undefined".
I looked for a solution to my problem in Google, but didn't find anything that could help me solve it.
但是它们都不起作用，警报窗口一直显示“未定义”。
我在 Google 中寻找解决问题的方法，但没有找到任何可以帮助我解决问题的方法。
回答by gblazex
<input onkeydown="myfunc(event)">
<input onkeydown="myfunc(event)">
function myfunc (e) {
e = e || window.event;
var code = e.keyCode;
alert (code);
}
