ES6 —— 字符串

for(let codePoint of ‘hello‘){
  console.log(codePoint);
}
// h
// e
// l
// l
// o

let userName = ‘小明‘;
let age = 26;
let result = `我叫${userName},我今年${age}岁。`
console.log(result);   // 我叫小明,我今年26岁。

let str = ‘hello world‘;
console.log(str.includes(‘hello‘));   // true
console.log(str.includes(‘hi‘));   // false

let str = ‘hello world‘;
console.log(str.startsWith(‘hello‘));   // true
console.log(str.startsWith(‘world‘));   // false

let str = ‘hello world‘;
console.log(str.endsWith(‘hello‘));   // false
console.log(str.endsWith(‘world‘));   // true

let str = ‘foo‘;
console.log(str.repeat(3));   // foofoofoo

let str = ‘foo‘;
console.log(str.padStart(10, ‘ab‘));   // abababafoo

let str = ‘foo‘;
console.log(str.padEnd(10, ‘ab‘));   // fooabababa

let str = ‘   hello‘;
console.log(str.length);   // 8
console.log(str.trimStart().length);   // 5

let str = ‘hello   ‘;
console.log(str.length);   // 8
console.log(str.trimEnd().length);   // 5