slot中使用slot，在IOS真机运行时无法使用methods中的方法

<template slot="sub">  
            <view class="cu-bar bg-white solid-bottom margin-top">  
                <view class="action">  
                    <text class="cuIcon-title text-orange">  
                        本地暂存订单列表，共{{localOrderList.length}}个  
                    </text>  
                </view>  
            </view>  
            <bus-list :listData="localOrderList" :has-operation="true">  
                <template slot="content" slot-scope="{item}">  
                    <view class="text-black text-bold">  
                        {{item.orderName}}    
                    </view>  
                    <view>  
                        <text class="text-orange">合计：￥{{item.discountPrice}}</text>  
                    </view>  
                </template>  
                <template slot="move" slot-scope="{item, index}">  
                    <view style="width: 130upx;float: left;" class="bg-green" @click="loadLocalOrder(item)">载入</view>  
                    <view style="width: 130upx;float: right;" class="bg-red" @click="deleteLocalOrder(index, item)">删除</view>  
                </template>  
            </bus-list>  
        </template>

在H5端没问题，在IOS真机调试出现问题
报错信息如下：
14:51:27.318 _vm.loadLocalOrder is not a function; [Component] Event Handler Error @ pages/shop/shopping-cart-bus-list-move1#handleEvent
14:51:27.338 forEach@[native code]
14:51:27.359 forEach@[native code]
14:51:27.380 handleEvent
14:51:27.401 app-service.js:3:425719
14:51:27.421 app-service.js:3:566466
14:51:27.442 __hookEvent@app-service.js:3:773
14:51:27.462 app-service.js:3:566435
14:51:27.482 app-service.js:3:569696
14:51:27.503 app-service.js:3:568970
14:51:27.532 n@app-service.js:3:171534
14:51:27.551 subscribeHandler@app-service.js:3:2190
14:51:27.572 app-service.js:2:87878
14:51:27.593 app-service.js:2:87899
14:51:27.613 O@app-service.js:2:8165
14:51:27.635 _e@app-service.js:2:22497
14:51:27.656 weex-main-jsfm.js:1:1383
14:51:27.676 map@[native code] __ERROR