派发更新

在派发更新更新中

1. 通过 setter 触发

set: function reactiveSetter (newVal) {debuggervar value = getter ? getter.call(obj) : val;/* eslint-disable no-self-compare */if (newVal === value || (newVal !== newVal && value !== value)) {return}/* eslint-enable no-self-compare */if (process.env.NODE_ENV !== 'production' && customSetter) {customSetter();}// #7981: for accessor properties without setterif (getter && !setter) { return }if (setter) {setter.call(obj, newVal);} else {val = newVal;}childOb = !shallow && observe(newVal);dep.notify();}

2. 调用 dep.notify()

Dep.prototype.notify = function notify () {// stabilize the subscriber list firstvar subs = this.subs.slice();if (process.env.NODE_ENV !== 'production' && !config.async) {// subs aren't sorted in scheduler if not running async// we need to sort them now to make sure they fire in correct// ordersubs.sort(function (a, b) { return a.id - b.id; });}for (var i = 0, l = subs.length; i < l; i++) {subs[i].update();}
};

采取 的方式是遍历subs[i] （watcher）通知 所有 的watcher

3. 重新 走一遍getter

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