How does javascript identify whether it is an array

How to identify an array in JavaScript: 1. Use the instanceof operator, with the syntax "variable name instanceof Array"; 2. Use the isArray() method, with the syntax "Array.isArray (variable name)".

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

javascript identifies whether it is an array

Method 1: Use instanceof operator

var cars=new Array();
cars[0]="Saab";
cars[1]="Volvo";
cars[2]="BMW";
// 判断是否支持该方法
if (cars instanceof Array) {
    document.write("是一个数组。") ;
}

Method 2: Use isArray method

var cars=new Array();
cars[0]="Saab";
cars[1]="Volvo";
cars[2]="BMW";
// 判断是否支持该方法
if (Array.isArray) {
    if(Array.isArray(cars)) {
        document.write("该对象是一个数组。") ;
    }}

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