理工酷

ECMAScript6引入了 String.prototype.includes

const string = "foo";
const substring = "oo";
console.log(string.includes(substring));

但是includes 不支持Internet Explorer。在ECMAScript 5或更以前的环境下，可以使用String.prototype.indexOf，当找不到子字符串时，返回-1：

var string = "foo";
var substring = "oo";
console.log(string.indexOf(substring) !== -1);

转载自：https://stackoverflow.com/questions/1789945/how-to-check-whether-a-string-contains-a-substring-in-javascript