Vue Js Push to Array

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<html>
  <head>
    <script type="importmap">
      {
        "imports": {
          "vue": "https://unpkg.com/vue@3/dist/vue.esm-browser.js"
        }
      }
    </script>
   
    <body>
      <div id="app">
        <h2>Vue js Array Add two elements</h2>
       
        <button @click="myFunction">Insert new Number</button>
        <p>Numbers : {{numbers}}</p>
      </div>
      <script type="module">
      import { createApp } from 'vue'
      createApp({
      data()
      { 
        return{ 
         numbers:['1','2','3','4','5','6'],
         
        } 
     }, 
     methods:{ 
         myFunction(){ 
            this.results = this.numbers.push('7','8'); 
           },
        }
    }).mount('#app')
  </script>
​
    </body>
  </head>
</html>