我不认为keyDown事件在这种情况下是必要的(如果我错了，请告诉我为什么)。在我的(非jquery)脚本类似的解决方案看起来像这样:

var _timer, _timeOut = 2000; 



function _onKeyUp(e) {
    clearTimeout(_timer);
    if (e.keyCode == 13) {      // close on ENTER key
        _onCloseClick();
    } else {                    // send xhr requests
        _timer = window.setTimeout(function() {
            _onInputChange();
        }, _timeOut)
    }

}

这是我在Stack Overflow上的第一个回复，所以我希望有一天这能帮助到别人:)

上面选择的答案不成立。

因为typingTimer偶尔会设置多次(对于快速键入者，按下键之前按下键两次)，那么它就不能正确清除。

下面的解决方案解决了这个问题，并将在完成OP请求后调用X秒。它也不再需要冗余的keydown函数。我还添加了一个检查，这样如果输入为空，函数调用就不会发生。

//setup before functions
var typingTimer;                //timer identifier
var doneTypingInterval = 5000;  //time in ms (5 seconds)

//on keyup, start the countdown
$('#myInput').keyup(function(){
    clearTimeout(typingTimer);
    if ($('#myInput').val()) {
        typingTimer = setTimeout(doneTyping, doneTypingInterval);
    }
});

//user is "finished typing," do something
function doneTyping () {
    //do something
}

和相同的代码在普通JavaScript解决方案:

//setup before functions
let typingTimer;                //timer identifier
let doneTypingInterval = 5000;  //time in ms (5 seconds)
let myInput = document.getElementById('myInput');

//on keyup, start the countdown
myInput.addEventListener('keyup', () => {
    clearTimeout(typingTimer);
    if (myInput.value) {
        typingTimer = setTimeout(doneTyping, doneTypingInterval);
    }
});

//user is "finished typing," do something
function doneTyping () {
    //do something
}

这个解决方案确实使用了ES6，但在这里没有必要。只需将let替换为var，将箭头函数替换为常规函数。

声明以下延迟函数:

var delay = (function () {
    var timer = 0;
    return function (callback, ms) {
        clearTimeout(timer);
        timer = setTimeout(callback, ms);
    };
})()

然后使用它:

let $filter = $('#item-filter');
$filter.on('keydown', function () {
    delay(function () {            
        console.log('this will hit, once user has not typed for 1 second');            
    }, 1000);
});    

前两个答案都不适合我。所以，这是我的解决方案:

var timeout = null;

$('#myInput').keyup(function() {
    clearTimeout(timeout);

    timeout = setTimeout(function() {
        //do stuff here
    }, 500);
});

如果您正在寻找特定的长度(例如邮政编码字段):

$("input").live("keyup", function( event ){
if(this.value.length == this.getAttribute('maxlength')) {
        //make ajax request here after.
    }
  });

哇，甚至有3条评论都是正确的!

Empty input is not a reason to skip function call, e.g. I remove waste parameter from url before redirect .on ('input', function() { ... }); should be used to trigger keyup, paste and change events definitely .val() or .value must be used You can use $(this) inside event function instead of #id to work with multiple inputs (my decision) I use anonymous function instead of doneTyping in setTimeout to easily access $(this) from n.4, but you need to save it first like var $currentInput = $(this);

编辑我看到有些人不理解没有复制粘贴就绪代码的指示。在这里你

var typingTimer;
//                  2
$("#myinput").on('input', function () {
    //             4     3
    var input = $(this).val();
    clearTimeout(typingTimer);
    //                           5
    typingTimer = setTimeout(function() {
        // do something with input
        alert(input);
    }, 5000);      
});