JavaScript:一个变量可以有多个值吗? [英] JavaScript: can a variable have multiple values?

问题描述

我对 jQuery 之外的 JavaScript 还是很陌生，我正在阅读 JavaScript 数组中的随机化 &使用带有随机数的 Array.sort 方法的缺点.我看到的建议是使用 Fisher-Yates shuffle.查看此方法的 JavaScript 代码:

I'm fairly new to JavaScript beyond jQuery, and I was reading up on randomization in a JavaScript array & the shortcomings of using the Array.sort method with a random number. I see the recommendation instead is to use the Fisher-Yates shuffle. In looking at the JavaScript code for this method:

Array.prototype.randomize = function()
{
    var i = this.length, j, temp;
    while ( --i )
    {
        j = Math.floor( Math.random() * (i - 1) );
        temp = this[i];
        this[i] = this[j];
        this[j] = temp;
    }
}

我被这条线震惊了:

var i = this.length, j, temp;

这是怎么回事?一个变量是否被赋予了多个值，或者这是某种东西的简写?

What's going on here? Is a variable being given multiple values, or is this shorthand for something?

推荐答案

一个变量永远不能同时有多个值.

A variable can never have multiple values at the same time.

您提供的代码是简写

var i = this.length;
var j;
var temp;

上面的语法在大多数编程语言中都是合法的.

Syntax like that above is legal in most programming languages.

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