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Detailed explanation of Vue.js implementation code for inserting repeated data into arrays

小云云
小云云Original
2017-12-19 17:06:111344browse

This article mainly introduces the implementation code of Vue.js inserting repeated data into an array. Friends who need it can refer to it. I hope it can help everyone.

1. By default, Vue.js does not support adding repeated data to an array. This can be achieved using track-by="$index".

2. Do not use track-by="$index" for array insertion. The array does not support the insertion of duplicate data.

2.1 JavaScript code


<script type="text/javascript" src="../js/vue-1.0.21.js"></script> 
  <script type="text/javascript"> 
   window.onload = function() { 
    vm = new Vue({ 
     el: &#39;#app&#39;, 
     data: { 
      arrMsg: [&#39;apple&#39;, &#39;orage&#39;, &#39;pear&#39;] 
     }, 
     methods: { 
      add: function() { 
       this.arrMsg.push(&#39;tamota&#39;); 
      } 
     } 
    }); 
   } 
  </script>

2.2 html code


<p id="app"> 
   <!--显示数据--> 
   <ul> 
    <li v-for="value in arrMsg" > 
     {{value}} 
    </li> 
   </ul> 
   <button type="button" @click="add">增加数据</button> 
  </p>

2.2 Result


3. Use track-by= Array insertion of "$index", the array supports the insertion of repeated data

3.1 Javascript code


<script type="text/javascript" src="../js/vue-1.0.21.js"></script> 
  <script type="text/javascript"> 
   window.onload = function() { 
    vm = new Vue({ 
     el: &#39;#app&#39;, 
     data: { 
      arrMsg: [&#39;apple&#39;, &#39;orage&#39;, &#39;pear&#39;] 
     }, 
     methods: { 
      add: function() { 
       this.arrMsg.push(&#39;tamota&#39;); 
      } 
     } 
    }); 
   } 
  </script>

3.2 html code


<p id="app" class="container"> 
   <!--显示数据--> 
   <ul> 
    <li v-for="value in arrMsg" track-by="$index" > 
     {{value}} 
    </li> 
   </ul> 
   <button type="button" @click="add" >增加数据</button> 
  </p>

3.3 Results

4. Complete code


 
 
  
   
   
   
   
  <script type="text/javascript" src="../js/vue-1.0.21.js"></script> 
  <script type="text/javascript"> 
   window.onload = function() { 
    vm = new Vue({ 
     el: &#39;#app&#39;, 
     data: { 
      arrMsg: [&#39;apple&#39;, &#39;orage&#39;, &#39;pear&#39;] 
     }, 
     methods: { 
      add: function() { 
       this.arrMsg.push(&#39;tamota&#39;); 
      } 
     } 
    }); 
   } 
  </script> 
  
  
  <p id="app" class="container"> 
   <!--显示数据--> 
   <ul> 
    <li v-for="value in arrMsg" track-by="$index" > 
     {{value}} 
    </li> 
   </ul> 
   <button type="button" @click="add" >增加数据</button> 
  </p> 
  

ps: Let’s take a look at the duplication of vue arrays and loop errors

Vue.js does not support adding repeated data to arrays by default. This can be achieved using track-by="$index".

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The most detailed vue.js installation tutorial

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