openwindow传递不了带变量的数组吗？ 打开的页面接收到的是undefined

如下代码，列表页打开详情页，使用openwindow打开接收新闻标题、时间、内容，但都显示undefined.
但是当我用数字的形式不用变量传递就可以。如title:data_title[1]
是什么问题导致无法接收使用变量形式的数组参数呢？

var data_title = new Array(),data_date = new Array(),data_content = new Array();  

//遍历取回的数据对象,其中data是通过ajax请求回来的json对象  
mui.each(data,function(index){  
    if(index==0){return};  
    sListOk = sListOk +   
                    '<div class="mui-slider-item">'+  
                     '<a href="show.html"  data-id="'+index+'">'+  
                     '<img src="'+domain+data[index].pic01_src+'">'+  
                     '<p class="mui-slider-title">'+data[index].title+'</p>'+  
                     '</a>'+  
                    '</div>';  
    sarr_img.push(data[index].pic01_src);  
    sarr_title.push(data[index].title);  
    slarr.push(index);  
    data_title.push(data[index].title);  
    data_date.push(data[index].add_time);  
    data_content.push(data[index].content);  
});  

//焦点图点击事件  
mui('#slider').on('tap', 'a', function() {  
        var id = this.getAttribute('href');  
        var href = this.href;  

        var data_id = parseInt(this.getAttribute('data-id'))-1;  
        var webview_style = {  
                        popGesture: "close",  
                        top: '0px',  
                        bottom: '0px'  
                        };                            
        mui.openWindow({  
                        id: id,  
                        url: this.href,  
                        styles: webview_style,  
                        show: {  
                              aniShow: aniShow  
                            },  
                        waiting: {  
                            autoShow: true,  
                            title:'正在加载...'  
                            },  
                            extras:{  
                                    title:data_title[data_id],  
                                    date:data_date[data_id],  
                                    content:data_content[data_id]  
                                }  
                            });  

});  

//目标页取值  
//接收传递来的值  
            var self=plus.webview.currentWebview();  
            var aTitle = document.getElementById("aTitle");  
            var aDate = document.getElementById("aDate");  
            var aContent = document.getElementById("aContent");  

            aTitle.innerHTML = self.title;  
            aDate.innerHTML = self.date;  
            aContent.innerHTML = self.content;