event.keycode vs event.which [英] event.keycode vs event.which

问题描述

因为没有专注于特定字段的按键输入键（确实是任何键），所以我犯了一个Firefox keydown 行为，不会触发 keydown 事件只会触发按键事件。

I fell foul of a Firefox keydown behavior in that pressing the enter key (indeed any key) without having focus on a specific field will NOT trigger a keydown event it will only trigger a keypress event.

这可能会令人困惑，因为 keydown 和 keyup 事件使用JavaScript键码，而使用ASCII码。幸运的是，13（输入/返回）是两者共同的。

This could be very confusing as the keydown and keyup event use JavaScript key codes whereas keypress uses ASCII codes. Fortunately 13 (enter/return) is common to both.

在这种情况下，使用 keypress 有什么好处？

Is there any known reason why FF using keypress in this circumstance? What is the benefit?

一旦建立IE8，就会产生一个愚蠢的，因为它不允许 preventDefault 要求 returnValue = false 以下来自其他SO帖子的片段已被证明是非常有用的：

Once this was established IE8 threw up a silly in that it does not permit preventDefault demanding instead returnValue = false the following snippet from another SO post has proved very useful:

event.preventDefault ? event.preventDefault() : event.returnValue = false;

在搜索解决这些问题期间，我一直被事件所困惑。键码 vs event.which 。也就是说，我使用类似于以下的switch语句做错：

During the search to resolve these issues I have been consistently confused by event.keycode vs event.which. Namely am I doing wrong using a switch statement similar to:

$("#class_Name").bind("keydown", function(event){
    // do not test input if field controls used
    switch(event.which){
       case 13:
       //enter key 
       event.preventDefault ? event.preventDefault() : event.returnValue = false;
       break;
     }

以下更好，如果是这样，为什么？

Is the following better, if so why?

$("body").keypress(function(event){
     // stop inadvertant form submission
     if (event.keycode == "13"){
       event.preventDefault ? event.preventDefault() : event.returnValue = false;
     }
});

我只想知道，所以我知道哪个是最好的申请。

I would just like to know so that I know which is best to apply.

非常感谢。 >

Many thanks.

推荐答案

某些浏览器使用 keyCode 而其他浏览器使用 / code>但是使用jQuery这是正常化，所以你不必考虑。你可以选择你喜欢的。

Some browsers use keyCode and others use which. But with jQuery this is normalized so you don't have to think about that. You can just choose the one you prefer.

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