HTML代码:

<input type="text" name="txt1" id="txt1" onkeypress="return AddKeyPress(event);" />      

<input type="button" id="btnclick">

Java脚本代码

function AddKeyPress(e) { 
        // look for window.event in case event isn't passed in
        e = e || window.event;
        if (e.keyCode == 13) {
            document.getElementById('btnEmail').click();
            return false;
        }
        return true;
    }

您的表单没有默认提交按钮

如果你的输入是搜索，你也可以使用on 'search'事件。例子

<input type="search" placeholder="Search" id="searchTextBox">

.

$("#searchPostTextBox").on('search', function () {
    alert("search value: "+$(this).val());
});

HTML代码:

<input type="text" name="txt1" id="txt1" onkeypress="return AddKeyPress(event);" />      

<input type="button" id="btnclick">

Java脚本代码

function AddKeyPress(e) { 
        // look for window.event in case event isn't passed in
        e = e || window.event;
        if (e.keyCode == 13) {
            document.getElementById('btnEmail').click();
            return false;
        }
        return true;
    }

您的表单没有默认提交按钮

您可以连接您自己的自定义事件

$('textarea').bind("enterKey",function(e){
   //do stuff here
});
$('textarea').keyup(function(e){
    if(e.keyCode == 13)
    {
        $(this).trigger("enterKey");
    }
});

http://jsfiddle.net/x7HVQ/

这里有一个插件给你:(小提琴:http://jsfiddle.net/maniator/CjrJ7/)

$.fn.pressEnter = function(fn) {  

    return this.each(function() {  
        $(this).bind('enterPress', fn);
        $(this).keyup(function(e){
            if(e.keyCode == 13)
            {
              $(this).trigger("enterPress");
            }
        })
    });  
 }; 

//use it:
$('textarea').pressEnter(function(){alert('here')})

<form name="searchForm" id="searchForm" onsubmit="doSomething(event)">
   <input type="text" name="search" id="search">
</form>
<script>
   function doSomething(event){
      let $val = $('form#searchForm input[name="search"]').val();
        console.log($val);
      event.preventDefault();
    }
</script>
 One simple way it can be done in this way. Enter text or number, hit enter key and get the entered input value.