如何检测用户何时在输入字段中按Enter键

问题描述：

我只有1个输入字段，我想注册onChange和onKeyPress事件来检测用户何时完成输入或按Enter键。我只需要使用javascript。感谢您的帮助。

I only have 1 input field and I want to register onChange and onKeyPress event to detect when the users finish their input or press the Enter key. I need to use javascript only. Thanks for the help.

我有：

var load = function (){
   //I want to trigger this function when user hit Enter key.
}

document.getElementById('co').onchange=load;   //works great
document.getElementById('co').onKeyPress=load; 
//not sure how to detect when user press Enter

html

//no form just a single input field
<input type='text' id='co'>

答

document.getElementById('foo').onkeypress = function(e){
    if (!e) e = window.event;
    var keyCode = e.keyCode || e.which;
    if (keyCode == '13'){
      // Enter pressed
      return false;
    }
  }

DEMO

如何检测用户何时在输入字段中按Enter键

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