[英]event in firefox “e is undefined”
I have a function that get the key code when pressed. 我有一个可以在按下时获取键码的功能。
Here is my code: 这是我的代码:
function Getkeycode(e){
var keycode = null;
if (window.event)
keycode = window.event.keyCode;
else
keycode = e.which;
return keycode;
}
window.onkeydown = function(){
alert(Getkeycode()); // I'm tried to using Getkeycode() or Getkeycode(e) but still error
}
Previous code works well in Internet Explorer, but in Firefox always occurs error message >> e is undefined
or e is not defined
先前的代码在Internet Explorer中运行良好,但在Firefox中始终会出现错误消息>>
e is undefined
或e is not defined
In IE, when an event occurs it is globally accessible in a window variable. 在IE中,当事件发生时,可以在窗口变量中全局访问它。 That's not the case in other browsers.
在其他浏览器中则不是这种情况。
In order to pass the event to your function, change your code to 为了将事件传递给函数,请将代码更改为
window.onkeydown = function(e){ // <== receive e
alert(Getkeycode(e)); // <== pass e
}
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