vue验证码组件

<template>
    <div class="join_formitem">
                <label class="enquiry">验证码  <span>:</span></label>
                <div class = ‘captcha‘>
                    <input type="text" placeholder="请输入验证码" class="yanzhengma_input" v-model="picLyanzhengma">
                    <input type="button"  @click="createCode"  class="verification" v-model="checkCode"/>
                </div>
            </div>
</template>

methods:{ 
// 图片验证码
    createCode(){
                 //先清空验证码的输入
                 this.code = "";
                 this.checkCode = "";
                 this.picLyanzhengma = "";
                 //验证码的长度  
                    var codeLength = 4; 
                    //随机数 
          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‘);  
          for(var i = 0; i < codeLength; i++) {
                        //取得随机数的索引（0~35）
                            var index = Math.floor(Math.random()*36);   
                            //根据索引取得随机数加到code上
              this.code += random[index];   
                    }
                    //把code值赋给验证码  
          this.checkCode = this.code; 
      }
}

.yanzhengma_input{
        font-family: ‘Exo 2‘, sans-serif;
    border: 1px solid #fff;
    color: #fff;
    outline: none;
    border-radius: 12px;
    letter-spacing: 1px;
    font-size: 17px;
    font-weight: normal;
        background-color: rgba(82, 56, 76, 0.15);
        padding: 5px 0 5px 10px;
    margin-left: 30px;
    height: 30px;
    margin-top: 25px;
    border: 1px solid #e6e6e6;
}
.verification{
    border-radius: 12px;
    width:100px;
    letter-spacing:5px;
    margin-left: 50px;
    height: 40px;
    transform: translate(-15px,0);
}
.captcha{
    height: 50px;
    text-align: justify;
}