如何将debounce fn实现到jQuery keyup事件中？

Question

计算基于用户输入,标准是使用keyup而不是change或blur.

问题是代码会在每次击键时触发,我需要它在500ms超时后才延迟和触发一次.我下面的例子显然不起作用,小提琴附件.

我找到了David Walsh的dbounce功能,但无法弄清楚如何实现它.

的jsfiddle

HTML:

<input type="text" />
<input type="text" id="n2" class="num" value="17" disabled />
<input type="text" id="n3" class="num" value="32" disabled />

使用Javascript/jQuery的:

$('input').keyup(function(){
    var $this=$(this);
    setTimeout(function(){
        var n1 = $this.val();
        var n2 = $('#n2').val();
        var n3 = $('#n3').val();
        var calc = n1 * n2 * n3;
        alert(calc);
    },500);
});

//http://davidwalsh.name/javascript-debounce-function
function debounce(func, wait, immediate) {
    var timeout;
    return function() {
        var context = this, args = arguments;
        var later = function() {
            timeout = null;
            if (!immediate) func.apply(context, args);
        };
        var callNow = immediate && !timeout;
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);
        if (callNow) func.apply(context, args);
    };
};

Answer 1

像这样使用它: -

$('input').keyup(debounce(function(){
        var $this=$(this);
        //alert( $this.val() );
        var n1 = $this.val();
        var n2 = $('#n2').val();
        var n3 = $('#n3').val();
        var calc = n1 * n2 * n3;
        alert(calc);
    },500));

小提琴