// in jquery source code...
 if (!event.which && ((event.charCode || event.charCode === 0) ? event.charCode : event.keyCode)) {
     event.which = event.charCode || event.keyCode;
 }

 // So you have just to use
 $('#searchbox input').bind('keypress', function(e) {
     if (e.which === 13) {
         alert('ENTER WAS PRESSED');
     }
 });

好吧，我瞎了:

e.which

将包含键的ASCII码。

参见https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/which

以下是对各种浏览器行为的详细描述http://unixpapa.com/js/key.html

根据Kilian的回答:

如果只输入按键很重要:

<form action="javascript:alert('Enter');">
<input type=text value="press enter">
</form>

编辑:这只适用于IE…

我知道这是一个旧帖子，但有人可能会发现这很有用。

键事件是映射的，所以除了使用keycode值，还可以使用key值使其更具可读性。

$(document).ready( function() {
    $('#searchbox input').keydown(function(e)
    {
     setTimeout(function ()
     { 
       //rather than using keyup, you can use keydown to capture 
       //the input as it's being typed.
       //You may need to use a timeout in order to allow the input to be updated
     }, 5);
    }); 
    if(e.key == "Enter")
    {
       //Enter key was pressed, do stuff
    }else if(e.key == "Spacebar")
    {
       //Spacebar was pressed, do stuff
    }
});

这里是一个小抄与映射键，我从这个博客

其实这样更好:

 var code = e.keyCode || e.which;
 if(code == 13) { //Enter keycode
   //Do something
 }