1.通过Object.prototype.toString.call来判断
console.log(Object.prototype.toString.call([1,2,3])); //[object Array]
2.通过instanceof来判断
console.log([1,2,3] instanceof Array); //true
3.通过constructor来判断
console.log(([1,2,3].constructor == Array));//true
4.通过原型链来判断
console.log([1, 2, 3].__proto__ == Array.prototype); //true
5.通过ES6.Array.isAaary()来判断
console.log(Array.isArray([1, 2, 3]));//true
6.通过Array.prototype.isPrototypeOf来判断
console.log(Array.prototype.isPrototypeOf([1, 2, 3]));//true
