H5 copy and paste text

H5 copy and paste text

<p>
     <span>单号：</span>
     <span id="inviteCode">34932040</span>
     <span @click='copy'>复制</span>
 </p>

copy() {
      var orderNum = document.getElementById("inviteCode").innerText;
      var oInput = document.createElement("input");
      oInput.value = orderNum;
      document.body.appendChild(oInput);
      oInput.select(); // 选择对象
      document.execCommand("Copy"); // 执行浏览器复制命令
      oInput.className = "oInput";
      oInput.style.display = "none";
      alert('复制成功');
   }