setWatcher(page) {
   let data = page.data; // 獲取page 頁(yè)面data
   let watch = page.watch;
   for(let i in watch){
     let key = i.split('.'); // 將watch中的屬性以'.'切分成數(shù)組
     let nowData = data; // 將data賦值給nowData
     let lastKey = key[key.length - 1];
     let watchFun = watch[i].handler || watch[i]; // 兼容帶handler和不帶handler的兩種寫(xiě)法
     let deep = watch[i].deep; // 若未設(shè)置deep,則為undefine
     this.observe(nowData, lastKey, watchFun, deep, page); // 監(jiān)聽(tīng)nowData對(duì)象的lastKey
     }
 },
 /\*\*
 \* 監(jiān)聽(tīng)屬性 并執(zhí)行監(jiān)聽(tīng)函數(shù)
 \*/
   observe(obj, key, watchFun, deep, page) {
     let val = obj[key];
     // 判斷deep是true 且 val不能為空 且 typeof val==='object'（數(shù)組內(nèi)數(shù)值變化也需要深度監(jiān)聽(tīng)）
     if (deep && val != null && typeof val === 'object') {
     for(let i in val){
     this.observe(val, i, watchFun, deep, page); // 遞歸調(diào)用監(jiān)聽(tīng)函數(shù)
   }
 }
   let that = this;
   Object.defineProperty(obj, key, {
   configurable: true,
   enumerable: true,
   set: function (value) {
     // 用page對(duì)象調(diào)用,改變函數(shù)內(nèi)this指向,以便this.data訪(fǎng)問(wèn)data內(nèi)的屬性值
     watchFun.call(page, value, val); // value是新值，val是舊值
     val = value;
     if (deep) { // 若是深度監(jiān)聽(tīng),重新監(jiān)聽(tīng)該對(duì)象，以便監(jiān)聽(tīng)其屬性。
      that.observe(obj, key, watchFun, deep, page);
     }
   },
   get: function () {
    return val;
   }
   })
 }

onLoad: function () {
   app.setWatcher(this);
     setTimeout(()=>{
     this.setData({
     name:"kangbosodoa"
     })
   },2000)
   },
   watch: {
     name: {
     handler(newValue,oldvalue) {
     console.log(this)
     console.log(newValue,oldvalue,"變化了");
     },
    deep: true
   },
   type:{
     handler(newValue) {
     console.log(newValue,"屬性發(fā)生變化");
     },
    deep: true // 是否深度監(jiān)聽(tīng)
   }
 },