//HTML
<input type="tel" id="duplication" >
<div class="btn">
<button type="button" class="layui-btn layui-btn-normal" id="duplication2" onclick="oCopy(this)" readonly="readonly">复制编号
</div>
//JS
function oCopy(obj){
$("#duplication").select()
document.execCommand('copy')
alert("复制成功")
}
