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<script>
document.onkeydown = function(){

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+"\n请使用Del键进行字符的删除操作！");
    window.event.returnValue=false;
}

}
</script>

<script type="text/javascript">
  document.onkeydown = function(){
   
      if(window.event && window.event.keyCode == 123) {
          window.location="about:blank"; //将当前窗口跳转置空白页
          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+"\n请使用Del键进行字符的删除操作！");
          window.event.returnValue=false;
      }
   
  }
  </script>