常见判断是对象还是数组的3种方法

1.constructor

var fruits = ["Banana", "Orange", "Apple", "Mango"];
var obj={}

function isArray(myArray) {
return myArray.constructor.toString().indexOf("Array") > -1;
}

console.log(isArray(fruits)) //true
console.log(isArray(obj)) //false

 2.Object.prototype.toString

console.log(Object.prototype.toString.call(fruits)); //[object Array]

3.instanceof

console.log(fruits instanceof Array) //true