ios6 userPicker的setData方法报错

var userPicker;  
    (function($, doc) {  
        $.init();  
        $.ready(function() {  
            var _getParam = function(obj, param) {  
                return obj[param] || '';  
            };  
            //普通示例  
            userPicker = new $.PopPicker({  
                layer: 3  
            });  
            console.log(userPicker.setData==undefined);  
            userPicker.setData([{  
                value: '110000',  
                text: '宁夏',  
                children: [{  
                    value: "110101",  
                    text: "银川市",  
                    children: [{  
                        value: "120101",  
                        text: "金凤区"  
                    }, {  
                        value: "120102",  
                        text: "西夏区"  
                    }, {  
                        value: "120104",  
                        text: "南开区"  
                    }, {  
                        value: "120104",  
                        text: "全部"  
                    }]  
                }, {  
                    value: "110000",  
                    text: "全部"  
                }]  
            }]);  
//......其他代码  
})(mui, document);

然后报错:
[INFO] : TypeError: undefined is not an object (evaluating 'userPicker.setData')
[LOG] : false
第二行信息是 我检测了userPicker.setData,不是undefined.但总是报这个错