watch,js

/*** 设置Watcher* @param {Object} page - 页面对象*/function setWatcher(page) {let data = page.data;let watch = page.watch;Object.keys(watch).forEach(v => {let key = v.split('.'); // 将watch中的属性以'.'切分成数组let nowData = data; // 将data赋值给nowDatafor (let i = 0; i < key.length - 1; i++) { // 遍历key数组的元素，除了最后一个！nowData = nowData[key[i]]; // 将nowData指向它的key属性对象}let lastKey = key[key.length - 1];// 假设key==='my.name',此时nowData===data['my']===data.my,lastKey==='name'let watchFun = watch[v].handler || watch[v]; // 兼容带handler和不带handler的两种写法let deep = watch[v].deep; // 若未设置deep,则为undefineobserve(nowData, lastKey, watchFun, deep, page); // 监听nowData对象的lastKey})}/*** 监听属性并执行监听函数* @param {Object} obj - 要监听的对象* @param {string} key - 要监听的属性键* @param {Function} watchFun - 监听函数* @param {boolean} deep - 是否深度监听* @param {Object} page - 页面对象*/function observe(obj, key, watchFun, deep, page) {let val = obj[key];// 判断deep是true 且 val不能为空 且 typeof val==='object'（数组内数值变化也需要深度监听）if (deep && val != null && typeof val === 'object') { Object.keys(val).forEach(childKey=>{ // 遍历val对象下的每一个keythis.observe(val,childKey,watchFun,deep,page); // 递归调用监听函数})}let that = this;Object.defineProperty(obj, key, {configurable: true,enumerable: true,set: function(value) {// 用page对象调用,改变函数内this指向,以便this.data访问data内的属性值watchFun.call(page,value,val); // value是新值，val是旧值val = value;if(deep){ // 若是深度监听,重新监听该对象，以便监听其属性。that.observe(obj, key, watchFun, deep, page); }},get: function() {return val;}})}module.exports = {setWatcher}

app.js设置全局

const watch = require("./utils/watch")
App({setWatcher(page){watch.setWatcher(page);
},

具体页面使用

    onLoad: function () {app.setWatcher(this)},watch: {//setData了textArray即会触发watchtextArray(newValue, oldValue) {console.log(newValue,oldValue);}},