帮我看看如下代码的拨打电话是否有错，返回后就是空白

<script>  
var source   =document.getElementById('entry-template').innerHTML;  
var template = Handlebars.compile(source);  
var selfWV,tel='0',uid;  
mui.plusReady(function() {  
    mui('#scroll').scroll();  
    selfWV = plus.webview.currentWebview();  
    window.addEventListener('newsId',function(event){  
        var id =event.detail.id;  
        selfWV.show(animationShow);  
        if(id){  
            loaddatelist.tutorone(id, function(rs) {  
                    if(rs.status===1){  
                        if(rs.list.fuwutime){  
                            document.getElementById("mui-scroll").innerHTML=template(rs.list)+rs.list.fuwutime;  
                        }else{  
                            document.getElementById("mui-scroll").innerHTML=template(rs.list);  
                        }  
                        //console.log(JSON.stringify(rs.list.fuwutime));  
                    if(rs.list.is_joint)  
                      tel=rs.list.tel;  
                    document.getElementById("htitle").innerHTML=rs.list.nick;  

                    }else{  
                        document.getElementById("mui-scroll").innerHTML=rs.content;  
                        //mui.toast(rs.content);  
                    }  
                    //console.log(JSON.stringify(rs.list));  
                });  
        }else{  
            mui.toast("参数错误"+id);  
        }  
    });  
    mui('.mui-bar-tab').on('tap', 'a', function(e) {  

    uid=user.uid();  
        if(!uid){  
            mui.toast("您还未登陆,不能咨询");  
            return;  
        }  
        if(tel!=0){  
            plus.device.dial( tel, false);  
        }else{  
            mui.toast("老师没发布电话哦");  
            return;  
        }  
    });  
});  
</script>

帮我看看如下代码的拨打电话是否有错，返回后就是空白。
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