vue makes verification code button countdown-JS Tutorial-php.cn

vue makes verification code button countdown

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Release： 2018-06-08 17:40:20

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This time I will bring you what to pay attention to when making a verification code button countdown with Vue. The following is a practical case, let’s take a look.

I searched online and tried their code, but I encountered many problems. Therefore, it is necessary to write a basic introductory article to avoid pitfalls for others later.

This is written in js according to the HTML page written on the Internet

<p class="register-pannel" id ="register-pannel"> 
      <p class="register-l" align="center"> 
        <p class="input-group" style="width: 300px;"> 
          <input type="text" class="form-control" placeholder="邮箱/手机号/用户名" style="height: 40px;" /> 
          <span class="glyphicon glyphicon-user form-control-feedback" aria-hidden="true" /> 
        </p> 
        <br /> 
        <p class="input-group" style="width: 300px;"> 
          <input type="text" class="form-control" placeholder="密码" style="height: 40px;" /> 
          <span class="glyphicon glyphicon-lock form-control-feedback" /> 
        </p> 
        <br /> 
        <p class="input-group" style="width: 300px;"> 
          <input type="text" class="form-control" placeholder="手机号" style="height: 40px;" /> 
          <span class="glyphicon glyphicon-phone form-control-feedback" /> 
        </p> 
        <br /> 
        <p class="input-group" style="width: 300px;"> 
            <span class="register-msg-btn" v-show="show" v-on:click="getCode">发送验证码</span> 
            <span class="register-msg-btn" v-show="!show">{{count}} s</span> 
          <input type="text" class="form-control" placeholder="验证码" style="float: right; height: 40px; width: 150px;" /> 
          <span class="glyphicon glyphicon-font form-control-feedback" /> 
        </p> 
        <br /> 
        <span class="btn-register">注册</span> 
      </p>

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I found that the browser keeps reporting errors

Uncaught SyntaxError: Unexpected token {

So according to the format of the official document, change the js structure to

<script> 
<span style="white-space: pre;">      </span>data(){   
<span style="white-space: pre;">      </span>return {   
<span style="white-space: pre;">        </span>show: true,   
<span style="white-space: pre;">        </span>count: '',   
<span style="white-space: pre;">        </span>timer: null,   
<span style="white-space: pre;">      </span>}  
<span style="white-space: pre;">    </span>},  
<span style="white-space: pre;">    </span>methods:{   
<span style="white-space: pre;">      </span>getCode(){    
<span style="white-space: pre;">        </span>const TIME_COUNT = 60;    
<span style="white-space: pre;">        </span>if (!this.timer) {     
<span style="white-space: pre;">          </span>this.count = TIME_COUNT;     
<span style="white-space: pre;">          </span>this.show = false;     
<span style="white-space: pre;">          </span>this.timer = setInterval(() => {     
<span style="white-space: pre;">            </span>if (this.count > 0 && this.count <= TIME_COUNT) {      
<span style="white-space: pre;">              </span>this.count--;      
<span style="white-space: pre;">            </span>} else {      
<span style="white-space: pre;">              </span>this.show = true;      
<span style="white-space: pre;">              </span>clearInterval(this.timer);      
<span style="white-space: pre;">              </span>this.timer = null;      
<span style="white-space: pre;">            </span>}     
<span style="white-space: pre;">          </span>}, 1000)     
<span style="white-space: pre;">        </span>}   
<span style="white-space: pre;">      </span>}   
<span style="white-space: pre;">    </span>} 
</script>

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Then the format is no problem, but the style does not take effect. It became something else.

I searched a lot on the Internet.

It is said that it is a problem with the js reference order.

It is said that js is written into

window.onload

. I tried it and found that it was all wrong. Later, the el attribute was discovered in the official documentation: providing a mounting element for the instance. The value can be a CSS selector, an actual HTML element, or a function that returns an HTML element.

So change it to

<script> 
    new Vue({ 
      el:'.register-pannel',      
      data:{    
        show:true,   
        timer:null, 
        count:'' 
      },  
      methods:{   
        getCode(){ 
          this.show = false; 
          const TIME_COUNT = 60;    
          if (!this.timer) {     
            this.count = TIME_COUNT;     
            this.show = false;     
            this.timer = setInterval(() => {     
              if (this.count > 0 && this.count <= TIME_COUNT) {      
                this.count--;      
              } else {      
                this.show = true;      
                clearInterval(this.timer);      
                this.timer = null;      
              }     
            }, 1000)     
          }   
        }   
      } 
    }); 
    </script>

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and the effect will come out.

# I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!