//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;

 }

};