Regarding the docs: Due to limitations in JavaScript, Vue cannot detect the following changes to an array: When you directly set an item ... ... <看更多>

First of all, declare all object properties (even with null values) before you add it to the array, they will become reactive properties observed by Vue. ... <看更多>

var vm = new Vue( { el: "#app", data: { user: { firstName: 'Peter', // reactive }, }, created() { this.$set(this.user, 'lastName', 'Chen') ... ... <看更多>

Marc Backes - Vue 3 Reactivity under the hood at Vuejs Global (Amsterdam)Vue.js Global Online ... ... <看更多>