【报Bug】openWindowWithTitle 跨域页面.....返回无效.....报错mui为定义

bug已修改，请于https://github.com/dcloudio/mui下载最新的mui，由于新页面没有引入mui，所以要重写返回事件，下面是我写的部分代码：

mui(".right1").on('tap', 'a', function() {  
    //获取id  
    mui.openWindowWithTitle({  
        url: 'http://www.baidu.com',  
        id: 'detail',  
        waiting: {  
            autoShow: false //自动显示等待框，默认为true  
        }  
    }, {  
        title: { //标题配置  
            text: "商品详情", //标题文字  
        },  
        back: { //左上角返回箭头  
            image: {  
                base64Data: 'data:image/png;base64,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'  
            },  
            click:function(){//重写返回事件  
                var wev = plus.webview.getWebviewById('detail');  
                console.log('guanbi');  
                wev.close();  
            }  
        },  
    });  
    plus.webview.getWebviewById('detail').evalJS("plus.key.addEventListener('backbutton',function(){plus.webview.getWebviewById('detail').close();})");//重写返回事件  
});