在我看来，一个更简单有效的方法应该是:

function onPress_ENTER()
{
        var keyPressed = event.keyCode || event.which;

        //if ENTER is pressed
        if(keyPressed==13)
        {
            alert('enter pressed');
            keyPressed=null;
        }
        else
        {
            return false;
        }
}

原生js(获取api)

document.onload = (() => { alert('ok'); let keyListener = document.querySelector('#searchUser'); // keyListener.addEventListener('keypress', (e) => { if(e.keyCode === 13){ let username = e.target.value; console.log(`username = ${username}`); fetch(`https://api.github.com/users/${username}`,{ data: { client_id: 'xxx', client_secret: 'xxx' } }) .then((user)=>{ console.log(`user = ${user}`); }); fetch(`https://api.github.com/users/${username}/repos`,{ data: { client_id: 'xxx', client_secret: 'xxx' } }) .then((repos)=>{ console.log(`repos = ${repos}`); for (let i = 0; i < repos.length; i++) { console.log(`repos ${i} = ${repos[i]}`); } }); }else{ console.log(`e.keyCode = ${e.keyCode}`); } }); })(); <input _ngcontent-inf-0="" class="form-control" id="searchUser" placeholder="Github username..." type="text">

整个文档按下回车键:

$(document).keypress(function (e) {
    if (e.which == 13) {
        alert('enter key is pressed');
    }
});

http://jsfiddle.net/umerqureshi/dcjsa08n/3/

<div class="nav-search" id="nav-search">
        <form class="form-search">
            <span class="input-icon">
                <input type="text" placeholder="Search ..." class="nav-search-input" id="search_value" autocomplete="off" />
                <i class="ace-icon fa fa-search nav-search-icon"></i>
            </span>
            <input type="button" id="search" value="Search" class="btn btn-xs" style="border-radius: 5px;">
        </form>

</div>

<script type="text/javascript">
    $("#search_value").on('keydown', function(e) {
        if (e.which == 13) {
             $("#search").trigger('click');
            return false;
        }
    });
    $("#search").on('click',function(){
        alert('You press enter');
    });
</script>

事件。键=== "Enter"

使用event.key。不再有任意的数字代码!

注意:旧属性(。keyCode和.which)已弃用。

const node = document.getElementsByClassName("mySelect")[0];
node.addEventListener("keydown", function(event) {
    if (event.key === "Enter") {
        event.preventDefault();
        // Do more work
    }
});

现代风格，有lambda和解构

node.addEventListener("keydown", ({key}) => {
    if (key === "Enter") // Handle press
})

Mozilla文档

支持的浏览器

我使用了document on，它涵盖了页面加载后动态添加的html:

  $(document).on('keydown', '.selector', function (event) {
    if (event.which == 13 || event.keyCode == 13) {
      //do your thang
    }
  });

增加来自@Bradley4的更新