js屏蔽功能键F1~12以及鼠标右键和鼠标左键

function window.onhelp(){return false} //屏蔽F1帮助

document.onkeydown = function(){

if(window.event && window.event.keyCode == 113) {
  window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 114) {
  window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 115) {
  window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 116) {
  window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 117) {
  window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 118) {
  window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 119) {
  window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 120) {
  window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 121) {
  window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 122) {
  window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 123) {
  alert("F12被禁用");
  event.keyCode=0;
  event.returnValue=false;
}
if(window.event && window.event.keyCode == 13) {
  window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 8) {
  alert(str+" 请使用Del键进行字符的删除操作！");
  window.event.returnValue=false;
}
if(window.event && window.event.keyCode == 505){
　　alert(str)
  window.event.returnValue=false;
}
}

  document.onmousedown=function(oEvent){
   if(window.event)
    oEvent=window.event;
   if(oEvent.button==2)
    alert("鼠标右键不可用");
if(oEvent.button==1)
    alert("鼠标左键不可用");

}

鼠标右键禁用还有种方式