JS代码片段

1. 对比cookie

 // cookie array

 function getCookieArrayByStr(str)
 {
     var cookies = str.split("; ");
     var cookieObj = {}
     for (var i=0; i<cookies.length; i++)
     {
         var line = cookies[i];
         var pos = line.indexOf("=");
         var key = line.substr(0, pos);
         var val = line.substr(pos+1);
         cookieObj[key] = val;
     }
     return cookieObj;
 }

 function getCookieArray()
 {
     return getCookieArrayByStr(document.cookie);
 }

 function compareCookie(strOldCookie)
 {
     var objOld = getCookieArrayByStr(strOldCookie);
     var objNew = getCookieArray();

     var oldOnly = {};
     var newOnly = {};
     var diff = {};

     for (var key1 in objOld)
     {
         var val1 = objOld[key1];
         var val2 = objNew[key1];
         if (typeof(val2) == "undefined")
         {
             oldOnly[key1] = val1;
         }
         else
         {
             if (val1 != val2)
             {
                 diff[key1] = {oldVal: val1, newVal: val2};
             }
         }
     }

     for (var key2 in objNew)
     {
         var val1 = objOld[key2];
         var val2 = objNew[key2];
         if (typeof(val1) == "undefined")
         {
             newOnly[key2] = val2;
         }
     }

     var retObj = {};
     retObj.__OLDO = oldOnly;
     retObj.__NEWO = newOnly;
     retObj.__DIFF = diff;

     return retObj;
 }

 var strOldCookie = "cookieUserId=1386816500920952; cuid=1386816500920605"

 var ret = compareCookie(strOldCookie);