js Json用法

 
           
           1、遍歷JSON對象代碼如下： 
           
           
           var packJson  = {"name":"Liza", "password":"123"} ;

for(var k in packJson ){//遍歷packJson 對象的每個key/value對,k為key
   alert(k + " " + packJson[k]);
} 
           
           
           2、遍歷JSON數組代碼如下： 
           
           
             
           
          var packJson = [{"name":"Liza", "password":"123"}, {"name":"Mike", "password":"456"}];

for(var i in packJson){//遍歷packJson 數組時，i為索引
   alert(packJson[i].name + " " + packJson[i].password);
}

  ajax(url, function (resText) {
                console.log(resText);
                var obj = JSON.parse(resText);
                for (var i in obj) {
                    console.log(obj[i].UserName);
                }
            });