1.用户名密码不为空检查：
function btnsubmit_onclick() 
 { 
    var userid  =  document.userInfoFormBean.userId.value; 
    var password  =  document.userInfoFormBean.pwd.value; 
     if (userid.indexOf( " ' " ) !=- 1 || password.indexOf( " ' " ) !=- 1 ) {
        alert( " 用户名、密码中包含非法字符 " );
         return   false ;
    }
     if  (userid == ""   ||  password == ""  )  
     { 
        window.alert( " 用户编码、密码不能为空！ " );
        document.userInfoFormBean.userId.focus();
        document.userInfoFormBean.pwd.focus();
         return   false ;
    }  
     else {                   
        document.userInfoFormBean.action = " /mms/doLoginAction.do " ;
         return   true ;
    }  
}

2.显示今天日期：
  < script >
                            todayDate  =   new  Date();
                            date  =  todayDate.getDate();
                            month =  todayDate.getMonth()  + 1 ;
                            year =  todayDate.getYear();
                            document.write( " 您好！  今天是 " )
                            document.write( " &nbsp;&nbsp; " )
                             if (navigator.appName  ==   " Netscape " )
                             {
                                document.write( 1900 + year);
                                document.write( " 年 " );
                                document.write(month);
                                document.write( " 月 " );
                                document.write(date);
                                document.write( " 日 " );
                            }
                             if (navigator.appVersion.indexOf( " MSIE " )  !=   - 1 )
                             {
                            document.write(year);
                            document.write( " 年 " );
                            document.write(month);
                            document.write( " 月 " );
                            document.write(date);
                            document.write( " 日 " );
                            document.write( " &nbsp;&nbsp; " )
                            }
                             if  (todayDate.getDay()  ==   5 ) document.write( " 星期五 " )
                             if  (todayDate.getDay()  ==   6 ) document.write( " 星期六 " )
                             if  (todayDate.getDay()  ==   0 ) document.write( " 星期日 " )
                             if  (todayDate.getDay()  ==   1 ) document.write( " 星期一 " )
                             if  (todayDate.getDay()  ==   2 ) document.write( " 星期二 " )
                             if  (todayDate.getDay()  ==   3 ) document.write( " 星期三 " )
                             if  (todayDate.getDay()  ==   4 ) document.write( " 星期四 " )
                             </ script >  

             下面是一路上有你兄弟那看到的咚咚，比我的好像更牛点

<span id="aa">当前时间</span><script>setInterval("aa.innerHTML=new Date().toLocaleString()+' 星期'+'日一二三四五六'.charAt(new Date().getDay());",1000);
</script> 

3.Html拥有JSP 的request.getParmerter("")功能（转自--一路有你）


HTML也可以通过JS来到得参数,函数如下(我将它保存到了一个数组里面):


//--------------------------------------------------------------------------
//Name: GetArgsFromHref
//
//Pupers: the function will get the parameters from the server
//
//Parameter:
//sHref---->>the current URL
//sArgName---->>the Array store the name of parameters which you want to get
//
//Return: Array to store the result
//
//Author: Jkallen
//----------------------------------------------------------------------------
function GetArgsFromHref(sHref, sArgName)
{
    var args  = sHref.split("?");
    var p_Result = new Array();
    
    if(args[0] == sHref) 
    {
         return p_Result; 
    }  
    var str = args[1];
    args = str.split("&");
    for(var i = 0; i < args.length; i ++)
    {
        str = args[i];
        var arg = str.split("=");
        if(arg.length <= 1) 
            continue;
        if(sArgName != null)
        {
            for(var c1 = 0; c1 < sArgName.length; c1++)
            {
                var tempValue = arg[0];
                if( tempValue == sArgName[c1])
                    p_Result[tempValue] = arg[1];
            }   
        }//end if
     }//end for
     
     return p_Result;
 }//end GetArgsFromHref
4.控制对象的显示和隐藏



 页面中的DIV：
       < DIV ID = " ds1 "  CLASS = " submenu "  STYLE = " display:none " >  
　　 < BR >< A HREF = "url1 "  target = " _blank " > XXXX </ A >  
         < br >
　　 < BR >< A HREF = " url2 "  target = " _blank " > XXXX2 </ A >  
　　 < BR > 　 
   </ DIV >


控制DIV显示和隐藏的函数
< SCRIPT >  
           var cm = null ; 
            document.onclick  =   new  Function( " show(null) " )  
             function getPos(el,sProp)  
 {var iPos  =   0  
                 while (el!=null)  
{iPos+=el["offset" + sProp] 
                             el = el.offsetParent} 
                          return iPos}   
function show(el,m)  
 { if  (m)  {m.style.display = '' ;  
                    m.style.pixelLeft  =  getPos(el, " Left " ) 
                    m.style.pixelTop  =  getPos(el, " Top " )  +  el.offsetHeight}   
            if ((m!=cm) && (cm)) 
                         cm.style.display='none';
                          cm=m;
}    
          function getIEPosX(elt) { return getIEPos(elt,"Left"); }
         function getIEPosY(elt) { return getIEPos(elt,"Top"); }
         function getIEPos(elt,which) {
                      iPos = 0
                     while (elt!=null) {
                     iPos += elt["offset" + which]
                    elt = elt.offsetParent
             }
 
当在页面里添加：
<td align="left" valign="top" ID="d1" onmouseover="show(this,ds1);"><img src="images/sheng_14.gif" name="Image107" width="151" height="24" border="0"></td>