Native js implements click copy function

1. Code:

   <input type="text">
   <button>复制</button>
   <script>
   var input = document.getElementsByTagName('input')[0]
   var button = document.getElementsByTagName('button')[0]
   button.onclick = function(){
       input.value = "hello world"
       input.select()
       document.execCommand("copy")
   }
   </script>

2. Effect:
   
   
3. Common methods of execCommand:

   cut
   delete
   copy