函数参数与返回值 |模板字面量与模板函数

*函数的参数和返回值

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>函数的参数与返回值</title>
  </head>
  <body>
    <script>
      // 常规参数
      let fn = (a, b) => a + b;
      console.log(fn(1, 5));
      //   参数不足 给参数默认值
      let f = (a, b = 1) => a * b;
      console.log(f(5));
      //   参数过多，用...arr接收
      f = (a, b, ...c) => console.log(a, b, c);
      console.log(f(1, 2, 3, 4, 5, 6));
      let arr = [1, 2, 3, 4, 5, 6];
      console.log(...arr);
      //返回多个值用数组或对象
      //数组
      let fnn = () => [1, 2, 3, 4];
      console.log(fnn());
      //对象
      fnnn = () => ({
        id: 1,
        name: "张老师",
        age: 33,
      });
      console.log(fnnn());
    </script>
  </body>
</html>

*模板字面量与模板函数

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>模板字面量和模板函数</title>
  </head>
  <body>
    <script>
      //用反引号表示模板字面量   支持在在字符串中插入变量和表达式   插值
      console.log(`Hello world`);
      let name = "张老师";
      console.log(`Hello` + name);
      //也可以如下 用‘${xxxx}’表示占位符
      console.log(`Hello ${name}`);
      //也可以用表达式
      let age = 1;
      console.log(`${age ? `男:${name}` : `女`}`);
      //模板函数，用模板字面量当参数时 就是模板函数
      price`数量:${20}单价:${50}`;
      function price(strings, ...args) {
        console.log(strings);
        console.log(args);
        console.log(`总价:${args[0] * args[1]}元`);
      }
    </script>
  </body>
</html>

Correcting teacher：

PHPz

Correction status：qualified

Teacher's comments：

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函数参数与返回值 |模板字面量与模板函数