页面跳转多次调用beforeback方法

A 页面预加载 B 页面，打开 B 页面时调用 B 页面的初始化方法，之后打开 B 页面 ， B页面完成逻辑处理，调用 mui.back() （调用mui.back之前调用breforback）， 将参数传给A页面的监听方法，此时正常，当再次点击按钮跳转B页面后，B页面再次返回A页面时，发现 breforback 方法调用2次，
再次跳转后，发现 breforback 方法调用3次。。。。。

A页面方法：

mui.init({  

                preloadPages:[  
                    {  
                        url:'../common/choosePerson.html',  
                        id:'choosePerson.html'  
                    }  
                ]  
            });  

            mui.plusReady(function(){  

                document.getElementById("chooseBtn").addEventListener('tap',function(){  

                    //初始化选人页面  
                    var choosePersonPage = null;  
                    if(!choosePersonPage){  
                        choosePersonPage = plus.webview.getWebviewById("choosePerson.html");  
                    }  
                    mui.fire(choosePersonPage,'init',{  
                        fromPage : "addMsg.html", //当前页面路径  
                        chooseType : "multi",  //single 单选、multi多选  
                        callback : "fillPerson" //指定回调函数  
                    });  

                    mui.openWindow({  
                        url:'../common/choosePerson.html',  
                        id:'choosePerson.html'  
                    });  
                });  

                document.getElementById("sendBtn").addEventListener('tap',function(){  
                    var content = document.getElementById("content").value;  
                    if(trimStr(content) == "") {  
                        mui.toast("请输入留言");  
                        return;  
                    }  
                });  

            });  

            //填充被选的人(选人之后回调函数)  
            window.addEventListener('fillPerson', function(event){  
                console.log(event.detail.personName);  
                console.log(event.detail.personId);   
            });  

B页面方法：

var fromPage,callback,personName,personId;
var chooseType = "single";

mui.init({
beforeback:function(){

    console.log("}}}" + personName);  
        console.log("}}}" + personId);  

    var backPage = plus.webview.getWebviewById(fromPage);  
    if(chooseType == "single") {  
        mui.fire(backPage,callback,{  
            personName : personName,  
            personId : personId  
        });  
    }else {  
        var name = personName.join(";");  
        var id = personId.join(",");  
        mui.fire(backPage,callback,{  
            personName : name,  
            personId : id  
        });  
    }  

    return true;  

}  

});

function init() {
personName = "";
personId = "";
var showPeople = document.getElementById("show");
showPeople.style.display = "none";
var showDiv = document.getElementById("showDiv");
showDiv.innerHTML = "";
var searchUrl = serverAddress + "platformOrganizationService/getPersonsTree";
var toData = {
"currId": ""
};
mui.ajaxSettings.contentType = "application/json";
mui.ajax(searchUrl, {
data: JSON.stringify(toData),
dataType: "json",
type: 'post',
success: function(data) {
putData(data);
},
error: function(xhr, type, errorThrown) {
ajaxError(xhr, type, errorThrown);
}
});

//完成按钮点击事件  
var finishBTN = document.getElementById('finishBTN');  
finishBTN.addEventListener('tap', function() {  
    if(chooseType == "single") {  
        if(checkSingleChoose() == false) {  
            mui.toast("请选择人员！");  
            return;  
        }  
    }else{   
        if(checkMultiChoose() == false) {  
            mui.toast("请选择人员！");  
            return;  
        }  
    }  
    mui.back();  
}, false);  

}

function checkSingleChoose() {
var radios = document.querySelectorAll('.peopleRadio');
for(n in radios) {
if(radios[n].checked == true) {
personName = radios[n].value;
personId = radios[n].id;
return true;
}
}
return false;
}

function checkMultiChoose() {
personName = new Array();
personId = new Array();
var flag = false;
var radios = document.querySelectorAll('.peopleRadio');
for(n in radios) {
if(radios[n].checked == true) {
personName.push(radios[n].value);
personId.push(radios[n].id);
flag = true;
}
}
return flag;
}

function putData(data) {

if (data != null) {  
    var table = document.getElementById('outerUl');  
    table.innerHTML = "";  
    for(n in data) {  
        //解析标题栏  
        var data_title = data[n];  
        table.innerHTML += '<li class="mui-table-view-cell mui-collapse"><a style="text-align: left;color: red;font-family: arial;">' + data_title.name + '</a></li>';  
        //解析部门层  
        var depts = data_title.children;  
        for(m in depts) {  
            var data_dept = depts[m];  
            //解析人员层  
            var buffer = new StringBuffer();  
            var peo = data_dept.children;  
            for(i in peo) {  
                var data_people = peo[i];  
                var name = data_people.name;  
                var id = data_people.id;  

                if(chooseType == "single") {  
                    buffer.append('<div class="mui-input-row mui-radio mui-right">');  
                }else {  
                    buffer.append('<div class="mui-input-row mui-checkbox">');  
                }  

                buffer.append('<label>' + name + '</label>');  
                var inputType = "checkbox";  
                if(chooseType == "single") {  
                    inputType = "radio";  
                }  
                buffer.append('<input id="' + id + '" name="people" type="' + inputType + '" class="peopleRadio" value="' + name + '" onclick="show(this);"/>');  
                buffer.append('</div>');  
            }  

            table.innerHTML +=   
                '<li class="mui-table-view-cell mui-collapse">' +  
                    '<a class="mui-navigate-right">' + data_dept.name + '</a>' +  
                    '<div class="mui-collapse-content">' +   
                        '<form class="mui-input-group">' +   
                            buffer.toString() +   
                        '</form>' +  
                    '</div>' +  
               '</li>';  
        }  

    }  
}  

}

function show(obj) {
var showPeople = document.getElementById("show");
var showDiv = document.getElementById("showDiv");
showPeople.style.display = "block";
var checked = obj.checked;

var id = obj.id;  
var name = obj.value;  

if(checked == true) {  
    showDiv.innerHTML +=  
        '<a id="show_' + id + '" class="mui-control-item" href="#">' +  
            '<font style="color: blue;">' + name + '</font>' +  
        '</a>';  
}else {  
    var delElement = document.querySelector('#show_' + id);  
    delElement.outerHTML = "";  
}  

}
//StringBuffer方法实现
function StringBuffer() {
this.content = new Array;
}
StringBuffer.prototype.append = function(str) {
this.content.push(str);
}
StringBuffer.prototype.toString = function() {
return this.content.join("");
}

window.addEventListener('init', function(event){
init();
fromPage = event.detail.fromPage;
chooseType = event.detail.chooseType;
callback = event.detail.callback;
});