js实现复制功能

html

<textarea cols="20" rows="10" id="tkl">
复制内容
</textarea>
<input type="button" onClick="copyTkl()" value="复制" />

js

function copyTkl() {
   const range = document.createRange();
   range.selectNode(document.getElementById('tkl'));
   const selection = window.getSelection();
   if (selection.rangeCount > 0) selection.removeAllRanges();
      selection.addRange(range);
      document.execCommand('copy');
     alert("复制淘口令成功......");
}