js 有没有string类型

// 定义字符串
let str1 = 'Hello, World!';
let str2 = "This is a string.";
let str3 = `Using template literals can include ${str1}`;

// 字符串操作方法
console.log(str1.length); // 输出：13
console.log(str1.toUpperCase()); // 输出：HELLO, WORLD!
console.log(str1.toLowerCase()); // 输出：hello, world!
console.log(str1.includes('World')); // 输出：true
console.log(str1.replace('World', 'Universe')); // 输出：Hello, Universe!

// 字符串拼接
let combinedStr = str1 + ' Welcome to JavaScript!';
console.log(combinedStr); // 输出：Hello, World! Welcome to JavaScript!

let parts = ['Hello', 'World', '!'];
let result = parts.join(' '); // 输出：Hello World !

let escapedStr = 'He said, "Hello!"';
console.log(escapedStr); // 输出：He said, "Hello!"

let templateStr = `He said, "Hello!"`;
console.log(templateStr); // 输出：He said, "Hello!"

let chineseStr = '你好，世界！';
console.log(chineseStr); // 输出：你好，世界！