<div id="box">被复制内容</div>
<button id="copyData">点击复制文本</button>
var copyFn = function () {
var val = document.getElementById('box');
window.getSelection().selectAllChildren(val);
document.execCommand("Copy");
alert("已复制好,可贴粘。");
}
$("#copyData").click(function(){
copyFn()
})