picker最后一级多选怎么弄，本人小白一枚

<DIV>
<textarea id="zbjg" placeholder="请点击此处" style="margin-top: .3rem; height: 1.8rem; "></textarea>
</DIV>

(function($, doc) {
$.init({
swipeBack:true //启用右滑关闭功能
});
mui.plusReady(function () {
var self = plus.webview.currentWebview();
qjsjbh=self.sjbh;
var states=getState();
yhbh=states.bh;
jzajxq(self.server, self.sjbh);
jzajlzxq(self.server, self.sjbh);

    //级联示例  
    var cityPicker = new $.PopPicker({  
        layer: 2  
    });  
    cityPicker.setData(cityData);  
    var showCityPickerButton = doc.getElementById('zbjg');  
    var zbjgxx = doc.getElementById('zbjg');  
    showCityPickerButton.addEventListener('tap', function(event) {  
        cityPicker.show(function(items) {  

            zbjgxx.innerText = items[0].text + " " + items[1].text;  
            wbjgbm=items[1].value;  
            wbjgmc=items[1].text;  

            //返回 false 可以阻止选择框的关闭  
            //return false;  

        });  
    }, false);  
});  

}(mui, document));

var cityData = [{
value: '1150781',
text: '一组',
children: [{
lable: "02040107",
text: "第一"
}, {
lable: "02040101",
text: "第二"
}, {
lable: "02040102",
text: "第三
lable: "02040104",
text: "第四"
}, {
lable: "02040113",
text: "第五"
}, {
lable: "02040116",
text: "第六"
}]
}]