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console 命令行工具 X clear 

                    

                        
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console

            
Vue.component('button-counter', {
  template: '<button v-on:click="count++">You clicked me {{ count }} times.</button>',
  data: function() {
    return {
      count: 0
    }
  }
})

new Vue({
  el: "#app-1"
})

            
<div id="app-1">
  <button-counter>
  </button-counter>
  <button-counter>
  </button-counter>
  <button-counter>
  </button-counter>
</div>

            

                
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