它只是一行下划线。js debounce函数:

$('#my-input-box').keyup(_.debounce(doSomething , 500));

这基本上是在我停止输入500毫秒后做某事。

欲了解更多信息:http://underscorejs.org/#debounce

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);      
});

同意@going的答案。下面是另一个类似的解决方案。唯一的区别是我使用的是.on("input"…)而不是keyup。这只捕获输入中的更改。其他按键如Ctrl, Shift等被忽略

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

//on input change, start the countdown

$('#myInput').on("input", function() {    
    clearTimeout(typingTimer);
    typingTimer = setTimeout(function(){
        // doSomething...
    }, doneTypingInterval);
});

你们听说过javascript中的闭包吗?!

它非常简单直接，只需将当前输入值与setTimeOut函数关闭的旧值进行比较，瞧，你就完成了。

let timer;
$('#myInput').on('keyup', function() {
  window.clearTimeout(timer);
  // here is the closures javascript magic happens.
  const value = $(this).val();
  timer = setTimeout(() => {
    if(value === $(this).val() && $(this).val()!== ''){
        alert($(this).val());
    }
  }, 500);
})

所以，我猜完成打字的意思是你停下来一段时间，比如5秒钟。考虑到这一点，让我们在用户释放一个键时启动一个计时器，并在他们按下一个键时清除它。我决定输入问题将是#myInput。

做一些假设…

//setup before functions
var typingTimer;                //timer identifier
var doneTypingInterval = 5000;  //time in ms, 5 seconds for example
var $input = $('#myInput');

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

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

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

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);
});