【报Bug】下拉刷新放到webview里面如果父页面顶部有内容就会遮挡

详细问题描述
[内容]
下拉刷新放到webview里面如果父页面顶部有内容就会遮挡
重现步骤
[步骤]
父页面

复制代码<header class="mui-bar mui-bar-nav">  
        <a id="back" class="mui-action-back mui-icon mui-icon-left-nav mui-pull-left"></a>  
        <h1 id="title" class="mui-title">下拉刷新和上拉加载更多</h1>  
    </header>  
mui.plusReady(function() {  
        var self = plus.webview.currentWebview();  
        //循环创建页面  
        for (var i = 0; i < subpages.length; i++) {  
            var temp = {};  
            var sub = plus.webview.create(subpages[i], subpages[i], subpage_style);  
            if (i > 0) {  
                sub.hide();  
            }else{  
                temp[subpages[i]] = "true";  
                mui.extend(aniShow,temp);  
            }  
            self.append(sub);  
        }  
    });

子页面

复制代码<div id="pullrefresh" class="mui-content mui-scroll-wrapper">  
            <div class="mui-scroll">  
                <!--数据列表-->  
                <ul class="mui-table-view mui-table-view-chevron">  

                </ul>  
            </div>  
        </div>  

mui.init({  
                pullRefresh: {  
                    container: '#pullrefresh',  
                    down: {  
                        callback: pulldownRefresh  
                    },  
                    up: {  
                        contentrefresh: '正在加载...',  
                        callback: pullupRefresh  
                    }  
                }  
            });  
            /**  
             * 下拉刷新具体业务实现  
             */  
            function pulldownRefresh() {  
                setTimeout(function() {  
                    var table = document.body.querySelector('.mui-table-view');  
                    var cells = document.body.querySelectorAll('.mui-table-view-cell');  
                    for (var i = cells.length, len = i + 3; i < len; i++) {  
                        var li = document.createElement('li');  
                        li.className = 'mui-table-view-cell';  
                        li.innerHTML = '<a class="mui-navigate-right">Item ' + (i + 1) + '</a>';  
                        //下拉刷新，新纪录插到最前面；  
                        table.insertBefore(li, table.firstChild);  
                    }  
                    mui('#pullrefresh').pullRefresh().endPulldownToRefresh(); //refresh completed  
                }, 1500);  
            }  
            var count = 0;  
            /**  
             * 上拉加载具体业务实现  
             */  
            function pullupRefresh() {  
                setTimeout(function() {  
                    mui('#pullrefresh').pullRefresh().endPullupToRefresh((++count > 2)); //参数为true代表没有更多数据了。  
                    var table = document.body.querySelector('.mui-table-view');  
                    var cells = document.body.querySelectorAll('.mui-table-view-cell');  
                    for (var i = cells.length, len = i + 20; i < len; i++) {  
                        var li = document.createElement('li');  
                        li.className = 'mui-table-view-cell';  
                        li.innerHTML = '<a class="mui-navigate-right">Item ' + (i + 1) + '</a>';  
                        table.appendChild(li);  
                    }  
                }, 1500);  
            }  
            if (mui.os.plus) {  
                mui.plusReady(function() {  
                    setTimeout(function() {  
                        mui('#pullrefresh').pullRefresh().pullupLoading();  
                    }, 1000);  

                });  
            } else {  
                mui.ready(function() {  
                    mui('#pullrefresh').pullRefresh().pullupLoading();  
                });  
            }

[结果]
下拉刷新那个刷新条被父页面的顶部内容遮挡
[期望]
给下解决办法。
运行环境

[系统版本]

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[mui版本]

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