js障蔽F5和后退

2012-09-16

js屏蔽F5和后退以下代码, 在file的输入框内输入文字,按下F5或者后退出错, 为什么啊?请指教HTML code!DOCT

js屏蔽F5和后退
以下代码, 在file的输入框内输入文字,
按下F5或者后退出错, 为什么啊?
请指教

HTML code

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML> <HEAD>  <TITLE> New Document </TITLE>  <META NAME="Generator" CONTENT="EditPlus">  <META NAME="Author" CONTENT="">  <META NAME="Keywords" CONTENT="">  <META NAME="Description" CONTENT="">  <SCRIPT LANGUAGE="JavaScript">  <!--    function keyEvent()    {        if ((event.keyCode == 116) || (event.keyCode == 8))        {            event.keyCode = 32;            event.cancelBubble = false;            event.returnValue = false;            return false;        }    }  //-->  </SCRIPT> </HEAD> <BODY onkeydown="keyEvent()">  <INPUT TYPE="file" VALUE="click"> </BODY></HTML>

[解决办法]
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<SCRIPT LANGUAGE="JavaScript">

</SCRIPT>
</HEAD>

<BODY onkeydown="keyEvent(event)">
<INPUT TYPE="file" VALUE="click">
</BODY>
</HTML>
[解决办法]
event.keyCode
ＩＥ，火狐下边定义不一样的，火狐下好像不叫keyCode
你用的那个浏览器
[解决办法]

JScript code

Js代码<script     language="javascript">          //禁止用F5键          function     document.onkeydown()          {                    if     (     event.keyCode==116)                      {                              event.keyCode     =     0;                              event.cancelBubble     =   true;                            return   false;                      }          }                     //禁止右键弹出菜单          function     document.oncontextmenu()          {                return   false;          }                     //下面代码实现全屏显示          function     window.onload(){                var     Request     =   new     Array();//保存参数                var     s     =     location.search.substring(1);                if     (s     &&     s!=""){                var     list     =     s.split("&");          for     (var     i=0;     i     <     list.length;     i++){          var     pair     =     list[i].split("=");          if     (pair[0]     &&     pair[0]     !=""){          Request[unescape(pair[0])]     =     unescape(pair[1]);          }          }                  }                           var     fullscreen=Request["fullscreen"];                if(fullscreen!="yes"){                var     file     =self.location;                var     a     =     window.open("about:blank","","fullscreen=yes")                  self.opener=null                  self.close()                  a.location=file     +   "?fullscreen=yes";                  }          }          </script>      <script language="Javascript"><!--       //屏蔽鼠标右键、Ctrl+N、Shift+F10、F11、F5刷新、退格键       //Author: meizz(梅花雨) 2002-6-18       function document.oncontextmenu(){event.returnValue=false;}//屏蔽鼠标右键       function window.onhelp(){return false} //屏蔽F1帮助       function document.onkeydown()       {       if ((window.event.altKey)&&       ((window.event.keyCode==37)|| //屏蔽 Alt+ 方向键 ←       (window.event.keyCode==39))) //屏蔽 Alt+ 方向键 →       {       alert("不准你使用ALT+方向键前进或后退网页！");       event.returnValue=false;       }       /* 注：这还不是真正地屏蔽 Alt+ 方向键，因为 Alt+ 方向键弹出警告框时，按住 Alt 键不放，用鼠标点掉警告框，这种屏蔽方法就失效了。以后若有哪位高手有真正屏蔽 Alt 键的方法，请告知。*/       if ((event.keyCode==8) || //屏蔽退格删除键       (event.keyCode==116)|| //屏蔽 F5 刷新键       (event.ctrlKey && event.keyCode==82)){ //Ctrl + R       event.keyCode=0;       event.returnValue=false;       }       if (event.keyCode==122){event.keyCode=0;event.returnValue=false;} //屏蔽F11       if (event.ctrlKey && event.keyCode==78) event.returnValue=false; //屏蔽 Ctrl+n       if (event.shiftKey && event.keyCode==121)event.returnValue=false; //屏蔽 shift+F10       if (window.event.srcElement.tagName == "A" && window.event.shiftKey)       window.event.returnValue = false; //屏蔽 shift 加鼠标左键新开一网页       if ((window.event.altKey)&&(window.event.keyCode==115)) //屏蔽Alt+F4       {       window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");       return false;       }       }       </script>

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