<div id="divId1">
<img id="aa" style="width:500px;" src="http://img-haodanku-com.cdn.fudaiapp.com/0_577537786836_1639378446.jpg_600">
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</div>
<button id="mybtn">一键复制</button>
</body>
<script src="https://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
$('#mybtn').click(function (e) {
window.getSelection().removeAllRanges();
var range = document.createRange();
var referenceNode = document.getElementById("divId1");
range.selectNode(referenceNode);
window.getSelection().addRange(range);
document.execCommand('copy');
});
</script>
