在调用map组件标记定位后 markets中有数据 页面也显示正常 切换到另外的页面后切换回来 页面数据中的markers中的数据消失

在加入一个登录页面后 没有执行函数 that.data.client.on('connect', that.ConnectCallback); that.data.client.on("message", that.MessageProcess); //获取应用实例 const app = getApp(); Page({   data: {     client: null,     topic: {       areaTopic: 'area',       LEDcontrolTopic: 'ledcontrol',      },     value: {       areaAValue:0,       areaBValue:0,       areaCValue:0,       areaDValue:0,     },     LED1Value: [{       LEDlogo: './../images/LED_gray.png',       ButtonValue: '区域1开灯',       ButtonFlag: true,     }],     LED2Value: [{       LEDlogo: './../images/LED_gray.png',       ButtonValue: '区域2开灯',       ButtonFlag: true,     }],     LED3Value: [{       LEDlogo: './../images/LED_gray.png',       ButtonValue: '区域3开灯',       ButtonFlag: true,     }],     LED4Value: [{       LEDlogo: './../images/LED_gray.png',       ButtonValue: '区域4开灯',       ButtonFlag: true,     }]   },   onLoad: function() {     var that = this;     this.data.client = app.globalData.client;     that.data.client.on('connect', that.ConnectCallback);     that.data.client.on("message", that.MessageProcess);     that.data.client.on("error", that.ConnectError);     that.data.client.on("reconnect", that.ClientReconnect);     that.data.client.on("offline", that.ClientOffline);     console.log("on load1");    },   onShow: function() {     console.log("on show1");   },   onHide: function() {     console.log("on hide1");   },   onUnload: function() {     console.log("on unload1");     var that = this;     that.data.client.end();   },   LedControl: function() {     var that = this;     if (that.data.LED1Value[0].ButtonFlag) {         that.setData({           'LED1Value[0].ButtonValue': '区域1关灯',           'LED1Value[0].ButtonFlag': false,           "LED1Value[0].LEDlogo": './../images/LED_red.png',         })       that.data.client.publish(that.data.topic.LEDcontrolTopic,'ckon1',{         qos: 1       });     } else {           that.setData({             'LED1Value[0].ButtonValue': '区域1开灯',             'LED1Value[0].ButtonFlag': true,             "LED1Value[0].LEDlogo": './../images/LED_gray.png',           })       that.data.client.publish(that.data.topic.LEDcontrolTopic,'ckoff1',{         qos: 1       });     }   },   LedContro2: function() {     var that = this;          if (that.data.LED2Value[0].ButtonFlag) {         that.setData({           'LED2Value[0].ButtonValue': '区域2关灯',           'LED2Value[0].ButtonFlag': false,           "LED2Value[0].LEDlogo": './../images/LED_red.png',         })         that.data.client.publish(that.data.topic.LEDcontrolTopic, 'ckon2',{         qos: 1         });     } else {           that.setData({             'LED2Value[0].ButtonValue': '区域2开灯',             'LED2Value[0].ButtonFlag': true,             "LED2Value[0].LEDlogo": './../images/LED_gray.png',           })       that.data.client.publish(that.data.topic.LEDcontrolTopic, 'ckoff2',{         qos: 1       });     }   },   LedContro3: function() {     var that = this;          if (that.data.LED3Value[0].ButtonFlag) {         that.setData({           'LED3Value[0].ButtonValue': '区域3关灯',           'LED3Value[0].ButtonFlag': false,           "LED3Value[0].LEDlogo": './../images/LED_red.png',         })       that.data.client.publish(that.data.topic.LEDcontrolTopic,'ckon3',{         qos: 1       });     } else {           that.setData({             'LED3Value[0].ButtonValue': '区域3开灯',             'LED3Value[0].ButtonFlag': true,             "LED3Value[0].LEDlogo": './../images/LED_gray.png',           })       that.data.client.publish(that.data.topic.LEDcontrolTopic, 'ckoff3',{         qos: 1       });     }   },   LedContro4: function() {     var that = this;          if (that.data.LED4Value[0].ButtonFlag) {         that.setData({           'LED4Value[0].ButtonValue': '区域4关灯',           'LED4Value[0].ButtonFlag': false,           "LED4Value[0].LEDlogo": './../images/LED_red.png',         })       that.data.client.publish(that.data.topic.LEDcontrolTopic, 'ckon4',{         qos: 1       });     } else {           that.setData({             'LED4Value[0].ButtonValue': '区域4开灯',             'LED4Value[0].ButtonFlag': true,             "LED4Value[0].LEDlogo": './../images/LED_gray.png',           })       that.data.client.publish(that.data.topic.LEDcontrolTopic, 'ckoff4',{         qos: 1       });     }   },   MessageProcess: function(topic, payload) {     var that = this;     //var payload_string = payload.toString();     //var jsonObj = JSON.parse(Uint8ArrayToString(payload));     //var payload = JSON.stringify(payload)     console.log("on MessageProcess");     var jsonObj = JSON.parse(payload);     var payload_areaA = jsonObj.aA;     var payload_areaB = jsonObj.aB;     var payload_areaC = jsonObj.aC;     var payload_areaD = jsonObj.aD;       if (topic == that.data.topic.areaTopic) {         that.setData({           'value.areaAValue': payload_areaA,           'value.areaBValue': payload_areaB,           'value.areaCValue': payload_areaC,           'value.areaDValue': payload_areaD,           })     }   },   ConnectCallback: function() {     var that = this;     console.log("connect callback ");          this.data.client.subscribe('area', {         qos: 1     });        },   ConnectError: function(error) {     console.log(error)   },   ClientReconnect: function() {     console.log("Client Reconnect")   },   ClientOffline: function() {     console.log("Client Offline")   } })

[图片] [图片] 同样的代码 引用的mqtt.js是一样的 在一个程序中可以用‘ckoff1’直接发送 一个只能发送json格式的数据 发送‘ckoff1’就报以上错误 有没有大佬给点思路 我想发不是json格式的 

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