js结合css实现登录后才能复制的效果实例

-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
-o-user-select: none;
user-select: none;

$(document).on("cut copy paste", function(e) {
        e.preventDefault();
});

$(document).on("contextmenu", function(e) {
    e.preventDefault();
});

window.addEventListener('copy',function(){
	const selection = window.getSelection();
	const copyNode = selection.getRangeAt(0).cloneContents();
}); 
const div = document.createElement('div');
div.appendChild(copyNode);
// 通过getComputedStyle获取style值，需要将节点挂载到dom树上，因此append到body
document.body.appendChild(div);
const nodelist = div.childNodes;
for (let i = 0; i < nodelist.length; i++) {
	const curnode = nodelist[i];
	const nodeType = curnode.nodeType;
	// 将节点类型为元素节点，并且设置了user-select:none的节点从复制的内容中过滤掉
	if (nodeType === 1 && window.getComputedStyle(curnode).userSelect === 'none') {div.removeChild(curnode);}
}
// 获取过滤后的数据
const cpt = div.innerHTML; 
selection.select(cpt); 
document.execCommand('copy');
//复制到剪切板