js方法返回字符串

function getString() {
    return "Hello, World!";
}

let myString = getString();
console.log(myString);  // 输出: Hello, World!

function getString() {
    // 没有返回值，会导致返回undefined
    // return;  // 这行代码会导致问题
}

// 正确的写法
function getString() {
    return "Hello, World!";
}

let num = 123;
let str = "The number is: " + num;  // 正确，num会被隐式转换为字符串
console.log(str);  // 输出: The number is: 123

// 或者使用显式转换
let strExplicit = "The number is: " + String(num);
console.log(strExplicit);  // 输出: The number is: 123

let stringWithQuotes = "He said, \"Hello, World!\"";
console.log(stringWithQuotes);  // 输出: He said, "Hello, World!"

let stringWithNewline = "First line\nSecond line";
console.log(stringWithNewline);
// 输出:
// First line
// Second line