JavaScript数组增删改查与基础语法详解

<doctype>
<html>
 <head>元素新增数组</head>
 <body>
   <div id="dem">点击会给原素组末尾新增元素个数</div>
   <button onclick="funct()">点击</button>
   <script type="text/javascript">
     var app = ["001","002","002"];
     function funct(){
       app.push("003","0005");
       var demo = document.getElementById("dem");
       demo.innerHTML = app;
     }
   </script>
 </body>
</html>

<!doctype html >
<html>
 <head></head>
 <body>
    <div id="dem">点击会给原素组前面新增元素个数</div>
   <button onclick="funct()">点击</button>
   <script type="text/javascript">
     var app = ["001","002","002"];
     function funct(){
       app.unshift("003","0005");
       var demo = document.getElementById("dem");
       demo.innerHTML = app;
     }
   </script>
 </body>
<html>

<!doctype html>
<html>
 <head>
 </head>
 <body>
   <div id="demo">移除最后一个元素</div>
   <button onclick="fun()"></button>
   <script type="text/javascript" charset="utf-8">
     var apple = ["001","002","003"];
     function fun(){
       apple.pop();
       var demo = document.getElementsById("demo");
       demo.innerHtml = apple;
     }
   </script>
 </body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
  <title>数组里面的push和pop</title>
</head>
<body>
   <div id="demo02">单击删除bing并tihuan一个元素</div>
   <button onclick="fun01()">删除</button>
   <script type="text/javascript">
     var apple = ["Sunday","Monday","Tuesday","Wednesday"];
     function fun01(){
       apple.splice(1,2,"2222"); //从Moday下标开始删除两个，替换为"2222"
       var demo = document.getElementById("demo02");
       demo.innerHTML = apple;
     }
   </script>
</body>
</html>

function fun(){
    var num = "01";
    switch (num){
       case "01":console.log("星期一"); //代码块
        break;
       case "02":fun01();
        break;
      default:console.log("星期八");
    }
}