如何将文本复制到剪贴板？

function CopyToClipboard(containerid) {
if (document.selection) { 
    var range = document.body.createTextRange();
    range.moveToElementText(document.getElementById(containerid));
    range.select().createTextRange();
    document.execCommand("Copy"); 

} else if (window.getSelection) {
    var range = document.createRange();
     range.selectNode(document.getElementById(containerid));
     window.getSelection().addRange(range);
     document.execCommand("Copy");
}}

<button id="button1" onclick="CopyToClipboard('copy1')">Click to copy1</button>
<div id="copy1" >Новинка!111</div>

<button id="button2" onclick="CopyToClipboard('copy2')">Click to copy2</button>
<div id="copy2" >Новинка!222</div>