/** * 设置监听器watch.js */export 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nowData for (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undefine observe(nowData, lastKey, watchFun, deep, page); // 监听nowData对象的lastKey })}/** * 监听属性 并执行监听函数 */function observe(obj, key, watchFun, deep, page) { var 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key 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) { 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。 observe(obj, key, watchFun, deep, page); } }, get: function () { return val; } })}module.exports = { setWatcher: setWatcher}
const watch = require("../../../utils/watch.js");/** * 生命周期函数--监听页面加载 */ onLoad: function (options) { watch.setWatcher(this); // 设置监听器,建议在onLoad下调用 // 取出登录信息 this.getLOginInfo(); }, watch: { ‘prescriptionInfo.prescr_type‘: function (value, oldValue) { if (value == 0) { // console.log(‘中药处方‘); let bottled = ‘prescriptionInfo.is_bottled‘; let taste_type = ‘prescriptionInfo.taste_type‘; let is_pregnant = ‘prescriptionInfo.is_pregnant‘; let is_suffering = ‘prescriptionInfo.is_suffering‘; let suffering_num = ‘prescriptionInfo.suffering_num‘; this.setData({ [bottled]: 0, [taste_type]: 1, [is_pregnant]: 0, [is_suffering]: 0, [suffering_num]: 1, }); } if (value == 2) { // console.log(‘膏方‘); let is_pregnant = ‘prescriptionInfo.is_pregnant‘; let is_suffering = ‘prescriptionInfo.is_suffering‘; let suffering_num = ‘prescriptionInfo.suffering_num‘; this.setData({ [is_pregnant]: 0, [is_suffering]: 0, [suffering_num]: 3, }); } }, },