vue makes verification code button countdown

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> 
      </p><p> 
        </p><p> 
          <input> 
          <span></span> 
        </p> 
        <br> 
        <p> 
          <input> 
          <span></span> 
        </p> 
        <br> 
        <p> 
          <input> 
          <span></span> 
        </p> 
        <br> 
        <p> 
            <span>发送验证码</span> 
            <span>{{count}} s</span> 
          <input> 
          <span></span> 
        </p> 
        <br> 
        <span>注册</span> 
      

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;">      data(){   
<span style="white-space: pre;">      return {   
<span style="white-space: pre;">        show: true,   
<span style="white-space: pre;">        count: &#39;&#39;,   
<span style="white-space: pre;">        timer: null,   
<span style="white-space: pre;">      }  
<span style="white-space: pre;">    },  
<span style="white-space: pre;">    methods:{   
<span style="white-space: pre;">      getCode(){    
<span style="white-space: pre;">        const TIME_COUNT = 60;    
<span style="white-space: pre;">        if (!this.timer) {     
<span style="white-space: pre;">          this.count = TIME_COUNT;     
<span style="white-space: pre;">          this.show = false;     
<span style="white-space: pre;">          this.timer = setInterval(() => {     
<span style="white-space: pre;">            if (this.count > 0 && this.count <= TIME_COUNT) {      
<span style="white-space: pre;">              this.count--;      
<span style="white-space: pre;">            } else {      
<span style="white-space: pre;">              this.show = true;      
<span style="white-space: pre;">              clearInterval(this.timer);      
<span style="white-space: pre;">              this.timer = null;      
<span style="white-space: pre;">            }     
<span style="white-space: pre;">          }, 1000)     
<span style="white-space: pre;">        }   
<span style="white-space: pre;">      }   
<span style="white-space: pre;">    } 
</script>

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:&#39;.register-pannel&#39;,      
      data:{    
        show:true,   
        timer:null, 
        count:&#39;&#39; 
      },  
      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>

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!

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