js转换json格式的数据以及遍历json里面的key和value

转换json格式的数据：

 var str = "{\"aaa\":\"bbb\"}";

var obj = eval("("+str+")");
        alert(obj.aaa); 

 

遍历json的key和Value

 var json={"afaf":"ddd","ffff":"aaaa"};

 var html;

 for(var i in json)

 {

         if (typeof (i) == "function") continue;  

                 html += "<\n>" + i + "<\t>" + jso [i].toString() + "<\n>"; 

 } 

 alert html;