var dic = {c:4, a:2, d:3, b:1}; // 定义一个字典

console.log("输出最初的字典元素: ");

for(var key in dic){

   console.log("key: " + key + " ,value: " + dic[key]);

}

console.log("字典元素按key值排序: ");

var res = Object.keys(dic).sort();

for(var key in res){

   console.log("key: " + res[key] + " ,value: " + dic[res[key]]);

}

console.log("字典元素按value值排序: ");

var res2 = Object.keys(dic).sort(function(a,b){ return dic[a]-dic[b]; });

for(var key in res2){

   console.log("key: " + res2[key] + " ,value: " + dic[res2[key]]);

}