为什么checkbox-group多选不能传值到另一wxml页面？
A.wxml
viewclass"weui-cells weui-cells_after-title">
viewclass"weui-cells__title">（选用第二项需备注）</view
checkbox-groupbindchange"checkboxChange">
labelclass"weui-cell weui-check__label"wx:for"{{checkboxItems}}"wx:key"value">
checkboxclass"weui-check"value"{{item.value}}"checked"{{item.checked}}"
viewclass"weui-cell__hd weui-check__hd_in-checkbox">
iconclass"weui-icon-checkbox_circle"type"circle"size"43"wx:if"{{!item.checked}}"></icon
iconclass"weui-icon-checkbox_success"type"success"size"33"wx:if"{{item.checked}}"></icon
</view
viewclass"weui-cell__bd">{{item.name}}</view
</label
</checkbox-group
</view
A.js checkboxItems: [
{ name: '是否匹配3', value: '3' },
{ name: '是否匹配4', value: '4' },
],
checkboxChange: function (e) {
console.log('checkbox发生change事件，携带value值为：', e.detail.value);
var checkboxItems = this.data.checkboxItems, values = e.detail.value;
for (var i = , lenI = checkboxItems.length; i < lenI; ++i) {
checkboxItems[i].checked = false
for (var j = , lenJ = values.length; j < lenJ; ++j) {
if (checkboxItems[i].value == values[j]) {
checkboxItems[i].checked = true
break
}
}
};
this.setData({
checkboxItems: checkboxItems
});
wx.setStorageSync('box', e.detail.value);
// wx.setStorageSync('boxs',checkboxItems);
},
B.wxml view类： {{box1}} </view
view类： {{box2}} </view
view类： {{box3}} </view
view类： {{boxs}} </view
B.js var checkboxItems = this.data.checkboxItems
var box = wx.getStorageSync('box');
var boxs = wx.getStorageSync('box', checkboxItems);
console.log("预约复选显示", box);
if(box == 3 ){
console.log("预约单选dian1");
var box1 = '单选3'
};
if (boxs == 4 ) {
console.log("预约dan选DAN2");
var box2 = '单选4'
if (boxs == 3,4 ) {
console.log("预约复选quanzhong2");
var box3 = '全部9'
};
单选（box=3）或者（boxs=4）都可以正常传值。 但是每次单选时，都会执行：
if (boxs == 3,4 ) {
console.log("预约复选quanzhong2");
var box3 = '全部9'
};
请问大佬这是什么情况？怎么才能实现只有当复选（boxs=3,4）时，才执行复选的if？？
