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);
});    

我喜欢Surreal Dream的答案，但我发现我的“doneTyping”函数会在每次按键时触发，即如果你快速输入“Hello”;当您停止输入时，该函数将触发5次，而不是只触发一次。

问题是javascript的setTimeout函数似乎不会覆盖或杀死任何旧的超时设置，但如果你自己做它工作!因此，如果设置了typingTimer，我只是在setTimeout之前添加了一个clearTimeout调用。见下文:

//setup before functions
var typingTimer;                //timer identifier
var doneTypingInterval = 5000;  //time in ms, 5 second for example

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

//on keydown, clear the countdown 
$('#myInput').on("keydown", function(){
    clearTimeout(typingTimer);
});

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

注意:我本来想把这句话作为对Surreal Dream的回答的评论，但我是一个新用户，没有足够的声誉。对不起!

修改接受的答案以处理额外的情况，如paste:

//setup before functions
var typingTimer;                //timer identifier
var doneTypingInterval = 2000;  //time in ms, 2 second for example
var $input = $('#myInput');

// updated events 
$input.on('input propertychange paste', function () {
    clearTimeout(typingTimer);
    typingTimer = setTimeout(doneTyping, doneTypingInterval);      
});

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

我需要为特定的控制运行我的程序，这对我来说很有效:

function debounce(func, timeout) {
            let timer;
            return (...args) => {
                clearTimeout(timer);
                timer = setTimeout(() => { func.apply(this, args); }, timeout);
            };
        }

$('#txtFilterClientCode').keyup(debounce(function () {
            console.log("Test");
        }, 1000));

很晚的答案，但我添加它是因为现在是2019年，这完全可以用漂亮的ES6实现，没有第三方库，而且我发现大多数高评分的答案都很笨重，有太多变量。

优雅的解决方案从这篇优秀的博客文章。

function debounce(callback, wait) {
  let timeout;
  return (...args) => {
      clearTimeout(timeout);
      timeout = setTimeout(function () { callback.apply(this, args); }, wait);
  };
}

window.addEventListener('keyup', debounce( () => {
    // code you would like to run 1000ms after the keyup event has stopped firing
    // further keyup events reset the timer, as expected
}, 1000))

如果你需要等待，直到用户完成输入使用简单的这个:

$(document).on('change','#PageSize', function () {
    //Do something after new value in #PageSize       
});

使用ajax调用的完整示例-这适用于我的寻呼机-每个列表的项目计数:

$(document).ready(function () {
    $(document).on('change','#PageSize', function (e) {
        e.preventDefault();
        var page = 1;
        var pagesize = $("#PageSize").val();
        var q = $("#q").val();
        $.ajax({
            url: '@Url.Action("IndexAjax", "Materials", new { Area = "TenantManage" })',
            data: { q: q, pagesize: pagesize, page: page },
            type: 'post',
            datatype: "json",
            success: function (data) {
                $('#tablecontainer').html(data);
               // toastr.success('Pager has been changed', "Success!");
            },
            error: function (jqXHR, exception) {
                ShowErrorMessage(jqXHR, exception);
            }
        });  
    });
});