SOURCE

function getSelect(targetNode) {
  // var targetNode=document.getElementById("biao1");
	var targetNode=document.getElementById("biao2");
  console.log(window.getSelection);
  if (window.getSelection) {
    //chrome等主流浏览器
    var selection = window.getSelection();
    var range = document.createRange();
    range.selectNode(targetNode);
    selection.removeAllRanges();
    selection.addRange(range);
  } else if (document.body.createTextRange) {
    //ie
    var range = document.body.createTextRange();
    range.moveToElementText(targetNode);
    range.select();
  }
  
  document.execCommand("Copy"); // 执行浏览器复制命令
}

<img id="biao1" src="https://sports.api.ibumobile.com/file/link?date=20190812&name=bc08515be04544a59ae5c9c0eb82cc0a.blob"  />
<div id="biao2">这是将要被复制的文字</div>
<!-- <div onClick="getSelect()">点击复制涛涛，除了微信都支持粘贴</div> -->
<div onClick="getSelect()">点击复制文字，所有平台都支持粘贴</div>