如何从jQuery集合中“弹出"或“转移" [英] How to 'pop' or 'shift' from jQuery set

问题描述

在Javascript中，数组应具有方法 pop 和 shift .

In Javascript, arrays should have methods pop and shift.

但是，JQuery对象似乎缺少以下方法:

However, JQuery objects seem to be missing these methods:

$('div').shift(); // Error, shift is undefined
$('div').pop(); // Error, pop is undefined
$('div').splice(); // Splice is OK actually

我想知道为什么缺少这些功能-毕竟jquery对象只是一个数组.

I wonder why these functions are missing - after all, the jquery object is just an array.

在jquery对象上执行弹出和移位功能的最简单方法是什么?

What's the easiest way of performing pop and shift functions on jquery objects?

推荐答案

它们丢失了，因为jQuery对象不是数组.

They're missing because a jQuery object isn't an Array.

(function( $ ) {
    $.fn.pop = function() {
        var top = this.get(-1);
        this.splice(this.length-1,1);
        return top;
    };

    $.fn.shift = function() {
        var bottom = this.get(0);
        this.splice(0,1);
        return bottom;
    };
})( jQuery );

编辑:.slice()不会修改原始对象.固定为使用.splice()代替.

.slice() doesn't modify the original object. Fixed to use .splice() instead.

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