Defining a JavaScript two-dimensional array is implemented using an array of defined arrays_Basic knowledge

1. JavaScript does not provide a method to directly define a two-dimensional array, but you can use the array that defines the array to define a JavaScript two-dimensional array: For example, to define a 4X3 two-dimensional array a, you can use the following method:
var a=new Array() ;
a[0]=new Array();
a[1]=new Array();
a[2]=new Array();
a[3]=new Array ();
The following is an example

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