找某字符串的所有非空字串

//题目：找出www.xx.com所有非空字串var str = "www.xx.com",count = {},i = 0;function cutstr(str,first,len){if(first+len <= str.length){while(first+len <= str.length){           var s = str.substr(first,len);first++;count[s]=0;}arguments.callee(str,0,++len);}}cutstr(str,0,1);for(var key in count){console.log(++i);console.log(key);}

?可惜答题那天算错鸟，悲剧。