includes判断字符串是否包含某个xxx

这边说一个比较好用的方法

includes使用方法特别简单

判断字符串

var a = 'aabbcc';

console.log(a.includes('aa'));   //true
console.log(a.includes('dd'));　　//false

数组判断

var arr =['哈哈','你好'];

console.log(arr.includes('坏'));   //false
console.log(arr.includes('你好'));  //true