javascript - Compatible with mainstream browsers, how to implement the clipboard function using js.

Question

PS: Preliminary discovery is that it is a browser compatibility issue. Only IE supports clipboardData. So the question is, is there a better method?
Problem description:
global.html There is an iframe with "id=biao1". Now I want to extract the text content of the p tag in the iframe through js and copy it to the clipboard. In this example, I want to use the clipboardData.setData method and If the following error message appears, please give me some advice.

Error message:

zhiliangbaobiao.js:8 Uncaught TypeError: Cannot read property 'setData' of undefined
at copysql1 (zhiliangbaobiao.js:8)
at HTMLInputElement.onclick (global.html:172)

global.html Main source code

<iframe id="biao1" src="test00.html" frameborder="0" style="width:100%;height:100%;"></iframe>

<input class="btn btn-success" onclick="copysql1()" value="点击复制代码" type="button">

zhiliangbaobiao main source code

var ifr = document.getElementById('biao1');
var ifrwin = ifr.window || ifr.contentWindow;
var temp = ifrwin.document.getElementsByTagName("p").item(0).innerText;
window.clipboardData.setData("text",temp); 

Answer 1

Use flash or let users copy manually.

Answer 2

You can use the clipboard.js library (pay attention to browser compatibility) or directly use Flash.