How to use js to save variables across pages to make menus_Navigation menu

最近公司在做一个项目，其中一块头部的菜单导航区，要求实现进入相关页面后上面的导航菜单图片也需变换．而这个对于静态页面或者用框架或iframe的来说是很容易实现的．而我们是利用include来包含进的这个top.asp．虽然可以在那个图片菜单上定义onclick的动作属性．但是只要一跳转页面，则这个onclick动作就没用了．因为top.asp被重新加载了．如果要解决这个问题，只能是在页面加载时能读取一个全局的变量，相对于浏览器的全局变量，通过这个变量的值来判断应该如何显示这个导航菜单．于是也便有了本文．

我想到的解决方法有两种：

１．利用cookies或session，在每个页面加载时写一个cookies或session变量，这个看似能很好的解决问题．但是却出现了一个问题．那就是如果用户禁止了cookies，则这个效果将无法实现，永远只是显示默认效果．所以我放弃这种做法

２．利用history或navigator来建立这么一个相对于浏览器的变量．只要我浏览器没关，则这个变量就会持续存在．这样就达到了我们想要的效果．我也是用这种方法来解决的．下面是具体实现部分．

 

//如果history.dmenu没有定义则设置为１即显示首页按扭的效果
  switch(history.dmenu){
   case 1:
    {
    //alert(history.dmenu);
    document.getElementById("d_id1").src="/images/anB1.gif";
    document.getElementById("d_id2").src="/images/anB2.gif";
    document.getElementById("d_id3").src="/images/anB3.gif";
    document.getElementById("d_id4").src="/images/anB4.gif";
    document.getElementById("d_id5").src="/images/anB5.gif";
    document.getElementById("d_id6").src="/images/anB6.gif";
    break;}
    case 2:
    {
    //alert(history.dmenu);
    document.getElementById("d_id1").src="/images/anB11.gif";
    document.getElementById("d_id2").src="/images/anB22.gif";
    document.getElementById("d_id3").src="/images/anB3.gif";
    document.getElementById("d_id4").src="/images/anB4.gif";
    document.getElementById("d_id5").src="/images/anB5.gif";
    document.getElementById("d_id6").src="/images/anB6.gif";
    break;
    }
    case 3:
    {
    document.getElementById("d_id1").src="/images/anB11.gif";
    document.getElementById("d_id2").src="/images/anB2.gif";
    document.getElementById("d_id3").src="/images/anB33.gif";
    document.getElementById("d_id4").src="/images/anB4.gif";
    document.getElementById("d_id5").src="/images/anB5.gif";
    document.getElementById("d_id6").src="/images/anB6.gif";
    break;
    }
    case 4:
    {
    document.getElementById("d_id1").src="/images/anB11.gif";
    document.getElementById("d_id2").src="/images/anB2.gif";
    document.getElementById("d_id3").src="/images/anB3.gif";
    document.getElementById("d_id4").src="/images/anB44.gif";
    document.getElementById("d_id5").src="/images/anB5.gif";
    document.getElementById("d_id6").src="/images/anB6.gif";
    break;
    }
    case 5:
    {
    document.getElementById("d_id1").src="/images/anB11.gif";
    document.getElementById("d_id2").src="/images/anB2.gif";
    document.getElementById("d_id3").src="/images/anB3.gif";
    document.getElementById("d_id4").src="/images/anB4.gif";
    document.getElementById("d_id5").src="/images/anB55.gif";
    document.getElementById("d_id6").src="/images/anB6.gif";
    break;
    }
    case 6:
    {
    document.getElementById("d_id1").src="/images/anB11.gif";
    document.getElementById("d_id2").src="/images/anB2.gif";
    document.getElementById("d_id3").src="/images/anB3.gif";
    document.getElementById("d_id4").src="/images/anB4.gif";
    document.getElementById("d_id5").src="/images/anB5.gif";
    document.getElementById("d_id6").src="/images/anB66.gif";
    break;
    }
  }
 }
 //上面是具体的判断那个变量然后据变量的值来进行图片的变换从而达到我们要的效果．

 function menushow(d_id){

  switch(d_id){
   case 1:
    history.dmenu=1;
    break;
   case 2:
    history.dmenu=2;
    break;
   case 3:
    history.dmenu=3;
    break;
   case 4:
    history.dmenu=4;
    break;
   case 5:
    history.dmenu=5;
    break;
   case 6:
    history.dmenu=6;
    break;
  }
 }
 //按下相关图片按钮后设置history.dmenu为相应的值从而在页面加载时能根据这个值来进行图片的变换

//-->

 
   
 
 
   
 
 
   
   
   
   
 

     
       
       
       
       
       
       
       
     
     
       
     
   

     
       
       
       
         
  
       
       
       
     
     
       
     
   

         
           
           
           
           
           
           
           
           
         

       

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The effect of this is as follows:

Look at the home page first:

Look at the effect after pressing the order view button: The trigger script I used is onclick="menushow(2)" in the above code, which means passing a 2 as the actual parameter, thus setting history.dmenu=2 like this The current status will be determined when the page is refreshed and loaded. Because this variable is relative to the browser. The effect is as follows:

今天测试时发现了一个问题，得用上面写的方法时对ＩＥ不支持，在火狐上没有问题，所以对程序进行了下小修改．过程是这样的．对于ＩＥ浏览器使用session来判断，每按一个按钮时就写一个session("dmenu")为相应的值，然后把这个值写在页面的一个隐藏域里，然后在页面初始化时判断是使用的什么类型浏览器，如果是ＩＥ的就执行通过session来判断的函数，而这个session则是通过获取那个隐藏域里的值，而如果是非ＩＥ浏览器就运用上面我昨天写的也就是上面的init函数来进行．判断代码如下：

 }

如此一来就完美的解决了这个问题．也许有朋友会说用session就可以了，但经过我的实验是用session火狐的根本不认，我也不知道什么原因，所以只好用我这个方法了．如果你有好方法请告诉我．

I found a problem during testing today. When using the method written above, IE is not supported. There is no problem on Firefox, so I made a small modification to the program. The process is like this. For IE browser, use session to judge. Every time you press a button, write a session("dmenu") as the corresponding value, then write this value in a hidden field of the page, and then judge whether it is used when the page is initialized. What type of browser is it? If it is IE, it will execute the function judged by the session, and this session will get the value in the hidden field. If it is a non-IE browser, it will use the init I wrote yesterday. function to perform. The judgment code is as follows: This solves this problem perfectly. Maybe some friends will say that using session is enough, but after my experiment, Firefox didn't recognize it at all when using session. I don't know why, so I had to use my method. If you have a good method please tell me.