JS array Detailed explanation of array

#Declaration method of array

//Create an array.

var arr1 = new Array();

arrayObj = new Array([size])

//Create an array and specify the length. Note that it is not the upper limit, but the length.

var a = new Array(5);

arrayObj = new Array([element0], [element1], ..., [elementN])

//Create an array and assign values.

var a = new Array(["b", 2, "a", 4,]);

arrayObj = [element0 , element1, ..., elementN]

//Abbreviation for creating an array and assigning values. Note that the square brackets here do not mean that they can be omitted.

var a = ["b", 2, "a", 4,];

Note: Pay attention to the " The difference between[]” and without “[]”

var a = new Array(5); //refers to creating an array with a length of5

var a = new Array([5]); //refers to creating an array with a length of1, and the first digit is5

Array operation (passing address)

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var t2=new Array(); t2[0]=1; t2[1]=2; test2(t2); //传地址（数组） function test2(var2) { for(var i=0;i
      
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