ES6基础之——判断字符串里是否包含其他字符串

let dessert = ‘cake‘,
drink = ‘tea‘
let breakfast =`今天的早餐是 ${dessert} 与 ${drink} !`;

console.log(breakfast.startsWith(‘今天‘)) //true
console.log(breakfast.endsWith(‘!‘)) //true
console.log(breakfast.includes(‘apple‘)) //false

console.log(breakfast.startsWith(‘今天‘,0)) //true
console.log(breakfast.endsWith(‘!‘,19)) //true
console.log(breakfast.includes(‘cake‘,5)) //true