什么是 javascript 中的数组文字表示法，什么时候应该使用它? [英] What is array literal notation in javascript and when should you use it?

问题描述

JSLint 给了我这个错误:

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第 11 行字符 33 的问题:使用数组文字表示法 [].

var myArray = new Array();

什么是数组字面量表示法，为什么要我用它来代替?

它在这里显示 new Array(); 应该可以正常工作......有什么我遗漏的吗?

解决方案

数组文字表示法是您仅使用空括号定义新数组的地方.在您的示例中:

var myArray = [];

这是定义数组的新"方式，我想它更短/更干净.

下面的例子解释了它们之间的区别:

var a = [],//这些都是一样的b = new Array(),//a 和 b 是长度为 0 的数组c = ['foo', 'bar'],//这些都是一样的d = new Array('foo', 'bar'),//c 和 d 是有 2 个字符串的数组//这些是不同的:e = [3],//e.length == 1, e[0] == 3f = 新数组(3)；//f.length == 3, f[0] == 未定义

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参考:声明 JavaScript 时Array()"和[]"有什么区别数组?

JSLint is giving me this error:

Problem at line 11 character 33: Use the array literal notation [].

var myArray = new Array();

What is array literal notation and why does it want me to use it instead?

It shows here that new Array(); should work fine... is there something I'm missing?

解决方案

array literal notation is where you define a new array using just empty brackets. In your example:

var myArray = [];

It is the "new" way of defining arrays, and I suppose it is shorter/cleaner.

The examples below explain the difference between them:

var a = [],            // these are the same
    b = new Array(),   // a and b are arrays with length 0

    c = ['foo', 'bar'],           // these are the same
    d = new Array('foo', 'bar'),  // c and d are arrays with 2 strings

    // these are different:
    e = [3],             // e.length == 1, e[0] == 3
    f = new Array(3);   // f.length == 3, f[0] == undefined

Reference: What’s the difference between "Array()" and "[]" while declaring a JavaScript array?

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