生成一个session id

//http://tools.ietf.org/html/rfc3548#section-4

var genSessionId = function(length){

         var str = genSessionId.characters;

         if ( !"0"[0] ) { //fix IE67

             str = str.split("");

         }

         for(var i=0,id="",len = str.length;i < length;i++){

             id += str[Math.floor(Math.random() * len)];

         }

         return id;

     }

     genSessionId.characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';

     alert(genSessionId(24))

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