vuejs验证码

<!DOCTYPE html>

<html>

<head>

  <meta charset="UTF-8">

</head>

<body>

  <div id="app">

    <!-- 验证码输入框 -->

    <input type="text" v-model="aaa" @blur="checkNum" />

    <!-- 验证码切换按钮 -->

    <input type="button" v-model="bbb" @click="createCode"/>

    <!-- 提示信息 -->

    <span type="text" style="color: red;">{{ ccc }}</span>

  </div>

</body>

  <!-- import Vue before Element -->

  <script src="https://unpkg.com/vue/dist/vue.js"></script>

  <script>

    new Vue({

      el: '#app',

      data: function() {

        return {

          aaa:"",

          bbb:"",

          ccc:"提示信息"

        }

      },

      created(){

        this.createCode();//初始化生成一个4位数的验证码

      },

      methods: {

        createCode(){

            var code = "";

            var codeLength = 4;//验证码的长度

            var random = new Array(0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R',

             'S','T','U','V','W','X','Y','Z');//随机数

            for(var i = 0; i < codeLength; i++) {

            //循环操作

            var index = Math.floor(Math.random()*36);//取得随机数的索引（0~35）

            code += random[index];//根据索引取得随机数加到code上

            }

            this.bbb = code;//把code值赋给验证码

        },

        checkNum(){

          var num = this.aaa.toUpperCase();//输入内容全部转化为大写

          if(num == this.bbb){

            this.ccc = "验证码正确";

          }else{

            this.ccc = "验证码错误";

            this.createCode();

          }

        }

      }

    })

  </script>

</html>
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