How to declare array length in jquery

How to declare the length of an array in jquery: directly use the [new Array(n)] statement to define an array of length n, declare an array with 10 elements, the code is [var a = new Array (10);].

The operating environment of this tutorial: windows7 system, jquery3.2.1 version, DELL G3 computer.

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How to declare the array length in jquery:

Use new Array directly (n)The statement can define an array of length n

Declare an array with 10 elements

var a = new Array(10);

At this time, the memory space has been opened for a, containing 10 elements , call it by adding [subscript] to the array name, such as a[2], but the element has not been initialized at this time, and the call will return undefined.

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