json数组输出，提取

<script>
mui.init();
//Start
mui.plusReady(function() {
var url = domain + "/api/mobile/index.php?mobile=no&version=1&module=forumdisplay&fid=50";
mui.ajax(url, {
dataType: 'json',
type: 'get',
timeout: 10000,
success: function(data) {
//console.log(JSON.stringify(data));
//var data = JSON.stringify(data);
var datas = data.Variables.forum_threadlist[0];
for(i in datas) {
console.log(i + '=' + datas[i]);

                        }  

                    },  
                    error: function(xhr, type, errorThrown) {  
                        console.log(type);  
                    }  

                });  
            });  
            //logo End  
        </script>  

打印出来只显示一条数据，要怎么把forum_threadlist数组输出。