JS的ES7支持
1.指数运算符(幂): **
2.Array.prototype.includes(value) : 判断数组中是否包含指定value
1 console.log(2**4); //16 2 3 let arr = [2,3,4,5,7,8]; 4 console.log(arr.includes(1)); //false 5 console.log(arr.includes(3)); //true
1 console.log(2**4); //16 2 3 let arr = [2,3,4,5,7,8]; 4 console.log(arr.includes(1)); //false 5 console.log(arr.includes(3)); //true
