MiniVue

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app"></div>
    <script src="../02-渲染器的实现/renderer.js"></script>
    <script src="../03-响应式系统/reactive-01_vue3.js"></script>
    <script src="./index.js"></script>
    <script>
        // 1.创建根组件
        const App = {
            data: reactive({
                counter: 0
            }),
            render() {
                return h('div', null, [
                    h('h2', null, `当前计数：${this.data.counter}`),
                    h('button', {
                        onClick: () => {
                            this.data.counter++
                        }
                    }, '+1')
                ])
            }
        }
        // 2.挂载根组件
        createApp(App).mount('#app')
    </script>
</body>
</html>

index.js

从框架的层面来说，我们需要有两部分内容：
- createApp用于创建一个app对象；
- 该app对象有一个mount方法，可以将根组件挂载到某一个dom元素上；

function createApp(rootComponent) {
    return {
        mount(Selector) {
            const container = document.querySelector(Selector)
            let isMounted = false // 默认没有挂载
            let oldVNode = null
            watchEffect(() => {
                if (!isMounted) {
                    oldVNode = rootComponent.render()
                    // console.log('oldVNode', oldVNode)
                    // 没有挂载则进行挂载
                    mounted(oldVNode, container)
                    isMounted = true
                } else {
                    const newVNode = rootComponent.render()
                    console.log('newVNode', newVNode, oldVNode)
                    patch(oldVNode, newVNode)
                    oldVNode = newVNode
                }
            })
        }
    }
}

MiniVue实现

MiniVue

index.js

渲染器的实现

响应式系统