打开网页后在地址栏里输入以下内容后按回车键：
javascript:alert((document.body.oncontextmenu='') + (document.body.ondragstart='') + (document.body.onselectstart ='') + (document.body.onselect='') + (document.body.oncopy='') + (document.body.onbeforecopy='') + (document.body.onmouseup=''))