javascript实现禁止右键和F12查看源代码

function click(e) {
				if (document.all) {
					if (event.button==2||event.button==3) { 
						alert("欢迎光临寒舍，有什么需要帮忙的话，请与站长联系！谢谢您的合作！！！");
						oncontextmenu='return false';
					}
				}
				if (document.layers) {
					if (e.which == 3) {
						oncontextmenu='return false';
					}
				}
			}
			
			if (document.layers) {
				document.captureEvents(Event.MOUSEDOWN);
			}
			document.onmousedown=click;
			document.oncontextmenu = new Function("return false;")

			document.onkeydown =document.onkeyup = document.onkeypress=function(){ 
				if(window.event.keyCode == 123) { 
					window.event.returnValue=false;
					return(false); 
				} 
			}