JS 屏蔽F1~F12的快捷键

 

  
    

   
     
   
     function
   
      window.onhelp(){
   
     return
   
      
   
     false
   
     } 
   
     //
   
     屏蔽F1帮助 
   
     
/*
   
     keyCod从113-123分别禁用了F2-F12键,13禁用了回车键(Enter),8禁用了退格键(BackSpace)
   
     */
   
      
 
 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
   
     ) { 
 window.event.keyCode 
   
     =
   
      
   
     505
   
     ; 
 } 
 
   
     if
   
     (window.event 
   
     &&
   
      window.event.keyCode 
   
     ==
   
      
   
     13
   
     ) { 
 window.event.keyCode 
   
     =
   
      
   
     505
   
     ; 
 } 
 
   
     if
   
     (window.event 
   
     &&
   
      window.event.keyCode 
   
     ==
   
      
   
     8
   
     ) { 
 alert(str
   
     +
   
     "
   
     \n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
   
     ; 
 } 
 }