Vue implementation counter case

This article example shares the specific code of Vue to realize the counter display for your reference. The specific content is as follows

Effect:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Counter</title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <style type="text/css">
       #app{
          text-align: center;
          margin: 0 auto;
          line-height: 500px;
       }

       #app input{
           width: 50px;
           height: 40px;
           font-size: 20px;
           border-radius: 5px;
           outline: none;
           /* Custom border */
           border: 1px solid transparent;
           background-color: blue;
           line-height: 30px;
           color: white;
       }
       #app span{
           padding: 20px 20px;
           border: 1px;
       }
       
    </style>
</head>
<body>
    <div id="app">
      <input type="button" value="-" @click="sub"/>
      <span>{{num}}</span>
      <input type="button" value="+" @click="add"/>
    </div>

    <script>
        var app = new Vue({
            el: "#app",
            data: {
                num: 1
            },
            methods:{
                add: function(){
                   if(this.num<10){
                    this.num++;
                   }else{
                       alert("reached the maximum!");
                   }                    
                },

                sub: function(){
                    if(this.num>0){
                        this.num--;
                    }else{
                        alert("It's gone!");
                    }
                    
                }
            }
        })
    </script>
</body>
</html>

Write the data you need in data : num
-Add two methods in methods : add and subtract
Use v-text or a difference expression to set num to the span tag
Use v-on : (abbreviation, @ ) to bind add and sub to the + and - buttons respectively.
Accumulation logic: if less than 10, accumulate, otherwise prompt
Decrement logic: greater than 0, gradually, otherwise prompt
The method uses the this keyword to obtain the data in data

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