What are the ways to define arrays in javascript

How to define an array in JavaScript: 1. Use the "var array name = [value list]" statement; 2. Use the "var array name = new Array (value list)" statement; 3. Use "var Array name = new Array (array length value); array name [subscript] = value;" statement.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

Use array literals to define

The syntax format of array literals: multiple value lists in square brackets, Separate with commas.

var 数组名=[值列表]

The value list can be empty, then an empty array will be created.

Example:

var a = [];  //空数组
var a = [1, true, "0", [1,0], {x:1,y:0}];  //包含具体元素的数组

Use the constructor method to define

Use the new operator to call Array() type function can construct a new array.

var 数组名 = new Array();  //空数组
var 数组名 = new Array(值列表);  //实数组

If you pass a numeric parameter to Array(), the parameter value is equal to the attribute value of the array length, which can define the length of the array, that is, the number of elements it contains.

var a = new Array(5);  //指定长度的数组

At this time, the default value of each element is undefined, which can be initialized by assigning a value to each element:

a[0] = 1;
a[1] = 2;
a[2] = 3;

[Recommended learning: javascript Advanced Tutorial】

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