方法一

插件：Clipboard

方法二

  1. <body>
  2.   <div>
  3.     <span id="copyMy"> 复制我试试</span>
  4.     <button onClick="copyFn()">点击复制</button>
  5.   </div>
  6.   <script>
  7.     function copyFn() {
  8.       var val = document.getElementById("copyMy");
  9.       window.getSelection().selectAllChildren(val);
  10.       document.execCommand("Copy");
  11.       alert("已复制好，可贴粘。");
  12.     }
  13.   </script>
  14. </body>