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The JavaScript array can initialize the size; when you use the new operator to call the Array () type function to create the array, you only need to pass a numeric parameter to the Array () function to initialize the array size and define the length of the array, that is, the number of elements it contains.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

JavaScript defines (creates or declares) an array in two ways: constructing an array and an array literal.

When you use the new operator to call a function of type Array (), you can construct a new array.

When you pass a numeric argument to the Array () function, you initialize the size of the array and define the length of the array, that is, the number of elements contained.

Example:

Var arr = new Array (5); / / an array of specified length console.log (arr)

You can see that the initialization array size defines the array length as 5, and there are no array elements in it.

When passing multiple values, you can create a real array.

Var arr = new Array (1, true, "string", [1Jue 2], {x true 1J y string 2}); / / Real array console.log (arr)

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