<div id="box">被複制內容</div>
<button id="copyData">點選複製文字</button>

 
var copyFn = function () {
       var val = document.getElementById('box');
       window.getSelection().selectAllChildren(val);
       document.execCommand("Copy");
       alert("已複製好，可貼粘。");
   }
   $("#copyData").click(function(){
       copyFn()
   })
 

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