How to determine whether it is an array in es6

3 ways to judge: 1. Use the "Array.isArray (array object)" statement to judge. If it is an array, it will return true. 2. Use the "array object.constructor===Array" statement to judge. 3. Use the "array object instanceof Array" statement to judge.

The operating environment of this tutorial: Windows 7 system, ECMAScript version 6, Dell G3 computer.

es6 method to determine whether it is an array:

Method 1: Use the isArray() method

isArray() method is used to determine whether an object is an array.

Returns true if the object is an array, otherwise returns false.

var fruits = ["Banana", "Orange", "Apple", "Mango"];
console.log(Array.isArray(fruits));
if(Array.isArray(fruits)){
	console.log("是数组");
}else{
	console.log("不是数组");
}

Method 2: Using the constructor attribute

Using the array object.constructor === Array statement , returns true if it is an array, otherwise returns false.

var fruits = ["Banana", "Orange", "Apple", "Mango"];
console.log(fruits.constructor === Array);
if(fruits.constructor === Array){
	console.log("是数组");
}else{
	console.log("不是数组");
}

Method 3: Use the instanceof operator

The instanceof operator is used to detect whether the prototype attribute of the constructor appears in a certain On the prototype chain of an instance object

var fruits = ["Banana", "Orange", "Apple", "Mango"];
console.log(fruits instanceof Array);
if(fruits instanceof Array){
	console.log("是数组");
}else{
	console.log("不是数组");
}

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