详解ES6新增字符串扩张方法includes()、startsWith()、endsWith()

let str = 'Hello world!';
let res1 = str.includes('Hello');
let res2 = str.includes('hi');
console.log(res1); // true
console.log(res2); // false

let str = 'Hello world!';
let res1 = str.startsWith('Hello');
let res2 = str.startsWith('world');
console.log(res1); // true
console.log(res2); // false

let str = 'Hello world!';
let res1 = str.endsWith('!');
let res2 = str.endsWith('d');
console.log(res1); // true
console.log(res2); // false

 let str = 'Hello World!'
 console.log(str.includes('World', 5)) // true 从索引5(包含索引5)开始搜索
 console.log(str.includes('World', 7)) // false
 console.log(str.startsWith('lo', 3)) // true
 console.log(str.startsWith('H', 3)) // false
 console.log(str.endsWith('Hel', 3)) // true
 console.log(str.endsWith('d', 3)) // false