var point = {x:0,y:0} <pre code_snippet_id="1607695" 

var john={"name":"john","sex":"meal","height":"168","weight":"52"};

var john={"name":"john","sex":"meal","height":"168","weight":"52"};
        for(var values in john)
        {
               alert(john[values]);
        }
        //
         for(i in john)
        {
               alert(john[i]);
        }
 

更新-----------------------------------------------------

突然發現for/in不好，for/of或者更好詳細請參考