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12月17号作业 JS数组及JS事件
遗忘了寂寞
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定义数组

  1. <script type="text/javascript">
  2.     //定义数组
  3.     var arr=['a','b','d'];
  4.     //控制台输出
  5.      console.log(arr);
  6. </script>

数组尾部添加元素

  1. <script type="text/javascript">
  2.     //定义数组
  3.     var arr=['a','b','d'];
  4.     //数组尾部添加元素
  5.     //返回值是数组的长度
  6.     arr.push('e');
  7.     console.log(arr);
  8. </script>

从数组尾部弹出一个元素

  1. <script type="text/javascript">
  2.     //定义数组
  3.     var arr=['a','b','d'];
  4.     //从数组尾部弹出一个元素
  5.     //返回值是被删除的元素
  6.     arr.pop();
  7.     console.log(arr);
  8. </script>

数组头部添加元素

  1. <script type="text/javascript">
  2.     //定义数组
  3.     var arr=['a','b','d'];
  4.     //数组头部添加元素
  5.     //返回值是数组的长度
  6.      arr.unshift('e');
  7.      console.log(arr);
  8. </script>

数组头部弹出一个元素

  1. <script type="text/javascript">
  2.     //定义数组
  3.     var arr=['a','b','d'];
  4.     //数组头部弹出一个元素
  5.     //返回值是被删除的元素
  6.       arr.shift();
  7.       console.log(arr);
  8. </script>

从数组中删除元素

  1. <script type="text/javascript">
  2.     //定义数组
  3.     var arr=['a','b','c','d'];
  4.       //从数组中删除元素
  5.       // splice(从哪里开删除，删除的长度)
  6.       arr.splice(1,2);
  7.       console.log(arr);
  8. </script>

从数组中查找元素

  1. <script type="text/javascript">
  2.     //定义数组
  3.     var arr=['a','b','c','d'];
  4.     //从数组中查找元素
  5.      //indexOf('要查找的元素','从哪开始查找')
  6.      //有的话返回下标，没有返回-1
  7.       var res = arr.indexOf('c');
  8.       console.log(res);
  9. </script>


onclick事件

  1. <!DOCTYPE html>
  2. <html>
  3.     <head>
  4.         <meta charset="utf-8">
  5.         <title></title>
  6.     </head>
  7.     <body>
  8.         <div>
  9.             <label>用户：</label><input type="text" name="" id="usename" value="" />
  10.         </div>
  11.         <div>
  12.             <label>密码：</label><input type="password" name="" id="password" value="" />
  13.         </div>
  14.         <button onclick="submits()">提交</button>
  16.         <script type="text/javascript">
  17.             function submits(){
  18.                 var usename=document.getElementById('usename').value;
  19.                 var password=document.getElementById('password').value;
  20.                 if(usename==''){
  21.                     alert('请输入用户名');
  22.                     return;
  23.                 }
  24.                 if(password==''){
  25.                     alert('请输入密码');
  26.                     return;
  27.                 }
  28.                 alert('用户： '+usename+' 欢迎登录');
  29.             }
  30.         </script>
  31.     </body>
  32. </html>




onmousemove，onmouseleave事件

  1. <!DOCTYPE html>
  2. <html>
  3.     <head>
  4.         <meta charset="utf-8">
  5.         <title></title>
  6.     </head>
  7.     <body>
  8.         <div onmousemove="aa()" onmouseleave="bb()">鼠标移到这里看看</div>
  9.         <script type="text/javascript">
  10.             function aa(){
  11.                 console.log('鼠标移上来了');
  12.             }
  13.             function bb(){
  14.                 console.log('鼠标移走了');
  15.             }
  16.         </script>
  17.     </body>
  18. </html>

onblur事件

  1. <!DOCTYPE html>
  2. <html>
  3.     <head>
  4.         <meta charset="utf-8">
  5.         <title></title>
  6.     </head>
  7.     <body>
  8.         <div>
  9.             <label>用户：</label><input type="text" name="" id="usename" value="" onblur="usename()"/>
  10.         </div>
  11.         <div>
  12.             <label>密码：</label><input type="password" name="" id="password" />
  13.         </div>
  14.         <button>提交</button>
  16.         <script type="text/javascript">
  17.             function usename(){
  18.                 var usename=document.getElementById('usename').value;
  19.                 if(usename==''){
  20.                     alert('请输入用户名');
  21.                     return;
  22.                     }
  23.             }
  24.         </script>
  25.     </body>
  26. </html>


onchange事件

  1. <!DOCTYPE html>
  2. <html>
  3.     <head>
  4.         <meta charset="utf-8">
  5.         <title></title>
  6.     </head>
  7.     <body>
  8.         <select id="province" onchange="aa()">
  9.             <option value ="1">北京</option>
  10.             <option value ="2">上海</option>
  11.             <option value ="3">广州</option>
  12.             <option value ="4">深圳</option>
  13.         </select>
  14.         <script type="text/javascript">
  15.             function aa(){
  16.                 var province=document.getElementById('province').value;
  17.                 alert('你当前选择的是： ' + province);
  18.             }
  19.         </script>
  20.     </body>
  21. </html>

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：在控制台查看结果, 是推荐的方式
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