javascript 中的数组文字表示法是什么？什么时候应该使用它？

发布于 2024-07-26 03:58:28 字数 243 浏览 5 评论 0原文

JSLint 给我这个错误：

第 11 行第 33 行的问题：使用数组文字表示法 []。

var myArray = new Array();

什么是数组文字表示法以及为什么它希望我使用它？

它在这里显示 new Array(); 应该可以正常工作......我缺少什么吗？

原文

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?

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卸妝后依然美 2024-08-02 03:58:28

数组文字表示法是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，我认为它更短/更干净。

下面的例子解释了它们之间的区别：

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

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

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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執念 2024-08-02 03:58:28

另请参阅： var x = new Array(); 有什么问题

除了 Crockford 的论点之外，我认为这也是因为其他语言具有类似的数据结构，并且恰好使用相同的语法；例如，Python 有列表和字典；请看下面的例子：

// this is a Python list
a = [66.25, 333, 333, 1, 1234.5]

// this is a Python dictionary
tel = {'jack': 4098, 'sape': 4139}

Python 在语法上也是正确的 Javascript，这不是很巧妙吗？（是的，结尾的分号不见了，但 Javascript 也不需要这些）

因此，通过重用编程中的常见范例，我们使每个人都不必重新学习一些不应该重新学习的东西。

Aside from the Crockford argument, I believe it is also due to the fact that other languages have similar data structures that happen to use the same syntax; for example, Python has lists and dictionaries; see the following examples:

// this is a Python list
a = [66.25, 333, 333, 1, 1234.5]

// this is a Python dictionary
tel = {'jack': 4098, 'sape': 4139}

Isn't it neat how Python is also grammatically correct Javascript? (yes, the ending semi-colons are missing, but those aren't required for Javascript, either)

Thus, by reusing common paradigms in programming, we save everyone from having to relearn something that shouldn't have to.

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