JS browser Copy

function copyArticle() {
	const range = document.createRange();
	range.selectNode(document.getElementById('content'));
	const selection = window.getSelection();
	if(selection.rangeCount > 0) selection.removeAllRanges();
	selection.addRange(range);
	document.execCommand('copy');
	alert ( "copy success!");
	}
	document.getElementById('copyBT').addEventListener('click', copyArticle, false);