//禁止F12
 document.onkeydown = function () {
 if (window.event && window.event.keyCode == 123) {
 event.keyCode = 0;
 event.returnValue = false;
 }
 if (window.event && window.event.keyCode == 13) {
 window.event.keyCode = 505;
 }
};

 //屏蔽右键菜单
document.oncontextmenu = function (event){
 if(window.event){
 event = window.event;
 }try{
 var the = event.srcElement;
if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")){
 return false;
 }
 return true;
 }catch (e){
 return false;
 }
};