常量、变量与函数

作业标题：0707作业
作业内容：

变量,常量,数据类型,实例演示,注意命名规范;
函数参数与返回值,匿名函数及箭头函数的转化,实例演示;

变量,常量,数据类型,实例演示

代码

<!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>常量与变量</title>
</head>
<body>
  <!-- 常量 -->
  <script>
    const TEST = "abcd";
    console.log(TEST);
    // 变量
    let userName = "张老师";
    console.log(userName);
    //基本数据类型 数值型
    let name = 10;
    console.log(typeof name);
    //字符型
    userName = "张老师";
    console.log(typeof userName);
    //布尔型
    let test = true;
    console.log(typeof test);
    //undefined型
    let test1;
    console.log(typeof test1);
    //null型
    let test2 = null;
    console.log(typeof test2);
    //引入型数据类型
    //数组
    const test3 = [1, 2, 3, 4, 5];
    console.log(typeof test3);
    //对象
    const test4 = { id: 002, userName: "张三" };
    console.log(typeof test4);
    //函数
    function test5() {
      return console("aaa");
    }
    console.log(typeof test5);
  </script>
</body>
</html>

函数参数与返回值,匿名函数及箭头函数的转化

代码

<!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>函数参数与返回值,匿名函数及箭头函数的转化,实例演示</title>
</head>
<body>
<script>
  // 函数参数与返回值
  function student(a, b) {
    return a + b;
  }
  console.log(student(40, 50));
  //   匿名函数
  let sum = function (a, b) {
    return a + b;
  };
  console.log(sum(30, 50));
  //箭头函数
  let sum1 = (a, b) => a + b;
  console.log(sum1(10, 60));
</script>
</body>
</html>

常量、变量与函数

常量、变量与函数

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