Briefly describe how javascript creates an array

In js, you can use the array method to create an array. The specific method is: 1. Create an array through the constructor. The syntax format is "let array name=new Array();"; 2. Create through literals. Array, the syntax format is "let array name=[];".

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

1. Create an array through the constructor

Create an array of a specified size

let array name = new Array (array length) ;

Create an empty array

let array name = new Array();

Create an array of given data

let array name = new Array(data1, data2, data3...);

2. Create an array through literals

Create an empty array

let array name = [];

Create an array of given data

let array name = [data1, data2, data3...];

Sample code

	<script>
	        //通过构造函数创建数组
	        let arr1 = new Array(3);
	        arr1[0] = 11;
	        arr1[1] = 12;
	        arr1[2] = 13;
	        let arr2 = new Array();
	        arr2[0] = 20;
	        arr2[1] = 21;
	        arr2[2] = 22;
	        let arr3 = new Array(31, 32, 33);
	        console.log(arr1);
	        console.log(arr2);
	        console.log(arr3);
	        
	        //通过字面量创建数组
	        let arr4 = [];
	        arr4[0] = 41;
	        arr4[1] = 42;
	        arr4[2] = 43;
	        let arr5 = [51, 52, 53];
	        console.log(arr4);
	        console.log(arr5);
	    </script>

Running effect

[Recommended learning: javascript advanced tutorial]

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