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演示常用函数类型、演示常用数据类型
Blackeye
Original
386 people have browsed it

hw

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>0330作业</title>
  8. </head>
  9. <body>
  10.     <script>
  11.         // 1.命名函数
  12.         function sub(v1, v2){
  13.             return v1-v2;
  14.         }
  15.         console.log(sub(2,1));
  17.         // 2.1匿名函数
  18.         let subn = function(v1,v2){
  19.             return v1-v2;
  20.         }
  21.         console.log(subn(4,2));
  23.         // 2.2立即调用函数（）
  24.         console.log(
  25.             (function(){
  26.                 return "Hello World.";
  27.             })()
  28.         )
  30.         // 3.箭头函数
  31.         let subv =  (v1,v2)=>{
  32.             return v1-v2;
  33.         }
  34.         console.log(subv(8,5));
  36.         // 3.2 一个参数的箭头函数
  37.         let say = name=>{
  38.             return "Hello, "+name;
  39.         }
  40.         console.log(say("Dave"));
  43.         // 3.3 没有参数的箭头函数
  44.         let email = ()=>{
  45.             return "1234@qq.com";
  46.         }
  47.         console.log(email());
  49.         // 3.4 只有一条语句可以不用大括号(默认return)
  50.         let phpClass = ()=>"Hello, php.cn";
  51.         console.log(phpClass());
  53.         // 数据类型
  54.         // 1.原始类型:number string boolean undefined null
  55.         console.log(typeof 100);
  56.         console.log(typeof "Hello");
  57.         console.log(typeof true);
  58.         let abc;
  59.         console.log(typeof abc);
  60.         let bcd = null;
  61.         console.log(typeof bcd);
  63.         // 2.引用类型: array object function
  64.         // 引用类型判断不能用typeof, Array.isArray()
  65.         let arr = [1,2,3,4]
  66.         console.log(arr);
  67.         console.log(arr[0]);
  69.         let obj = {
  70.             id:"1",
  71.             option:"2"
  72.         }
  73.         console.log(obj);
  74.         console.log(obj.id);
  75.         console.log(obj['id']);
  77.         function getName(){
  78.             return "Hello, Dave";
  79.         }
  80.         console.log(getName());
  82.     </script>
  83. </body>
  84. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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