原文地址：

最终效果如下：

构造器(constructor)

构造一个TinyVue对象，包含基本的el，data，methods

class TinyVue{    constructor({el, data, methods}){        this.$data = data        this.$el = document.querySelector(el)        this.$methods = methods        // 初始化        this._compile()        this._updater()        this._watcher()    }}

编译器(compile)

用于解析绑定到输入框和下拉框的v-model和元素的点击事件@click。

// el为元素tagName，attr为元素属性（v-model，@click）_initEvents(el, attr, callBack) {    this.$el.querySelectorAll(el).forEach(i => {        if(i.hasAttribute(attr)) {            let key = i.getAttribute(attr)            callBack(i, key)        }    })}

载入输入框事件

this._initEvents('input, textarea', 'v-model', (i, key) => {    i.addEventListener('input', () => {        Object.assign(this.$data, {[key]: i.value})    })})

载入选择框事件

this._initEvents('select', 'v-model', (i, key) => {    i.addEventListener('change', () => Object.assign(this.$data, {[key]: i.options[i.options.selectedIndex].value}))})

载入点击事件

点击事件对应的是methods中的事件

this._initEvents('*', '@click', (i, key) => {    i.addEventListener('click', () => this.$methods[key].bind(this.$data)())})

视图更新器(updater)

同理先创建公共函数来处理不同元素中的视图，包括input、textarea的value，select的选择值，div的innerHTML

_initView(el, attr, callBack) {    this.$el.querySelectorAll(el, attr, callBack).forEach(i => {        if(i.hasAttribute(attr)) {            let key = i.getAttribute(attr),                data = this.$data[key]            callBack(i, key, data)        }    })}

更新输入框视图

this._initView('input, textarea', 'v-model', (i, key, data) => {    i.value = data})

更新选择框视图

this._initView('select', 'v-model', (i, key, data) => {    i.querySelectorAll('option').forEach(v => {        if(v.value == data) v.setAttribute('selected', true)        else v.removeAttribute('selected')    })})

更新innerHTML

这里实现方法有点low，仅想到正则替换{

let regExpInner = /\{
   { *([\w_\-]+) *\}}/gthis.$el.querySelectorAll("*").forEach(i => {    let replaceList = i.innerHTML.match(regExpInner) || (i.hasAttribute('vueID') && i.getAttribute('vueID').match(regExpInner))    if(replaceList) {        if(!i.hasAttribute('vueID')) {            i.setAttribute('vueID', i.innerHTML)        }        i.innerHTML = i.getAttribute('vueID')        replaceList.forEach(v => {            let key = v.slice(2, v.length - 2)            i.innerHTML = i.innerHTML.replace(v, this.$data[key])        })    }})

监听器(watcher)

数据变化之后更新视图

_watcher(data = this.$data) {    let that = this    Object.keys(data).forEach(i => {        let value = data[i]        Object.defineProperty(data, i, {            enumerable: true,            configurable: true,            get: function () {                return value;            },            set: function (newVal) {                if (value !== newVal) {                    value = newVal;                    that._updater()                }            }        })    })}

使用

    
    
     
     
    
     
     
    
     
     
    
     加一    
     
您输入的是：{
   {text1}}+{
   {text2}}+{
   {text3}}
    
             Volvo        Saab        
             Volvo        Saab        
     
您选择了：{
   {select}}
    

TinyVue全部代码

class TinyVue{    constructor({el, data, methods}){        this.$data = data        this.$el = document.querySelector(el)        this.$methods = methods        this._compile()        this._updater()        this._watcher()    }    _watcher(data = this.$data) {        let that = this        Object.keys(data).forEach(i => {            let value = data[i]            Object.defineProperty(data, i, {                enumerable: true,                configurable: true,                get: function () {                    return value;                },                set: function (newVal) {                    if (value !== newVal) {                        value = newVal;                        that._updater()                    }                }            })        })    }    _initEvents(el, attr, callBack) {        this.$el.querySelectorAll(el).forEach(i => {            if(i.hasAttribute(attr)) {                let key = i.getAttribute(attr)                callBack(i, key)            }        })    }    _initView(el, attr, callBack) {        this.$el.querySelectorAll(el, attr, callBack).forEach(i => {            if(i.hasAttribute(attr)) {                let key = i.getAttribute(attr),                    data = this.$data[key]                callBack(i, key, data)            }        })    }    _updater() {        this._initView('input, textarea', 'v-model', (i, key, data) => {            i.value = data        })        this._initView('select', 'v-model', (i, key, data) => {            i.querySelectorAll('option').forEach(v => {                if(v.value == data) v.setAttribute('selected', true)                else v.removeAttribute('selected')            })        })        let regExpInner = /\{
   { *([\w_\-]+) *\}}/g        this.$el.querySelectorAll("*").forEach(i => {            let replaceList = i.innerHTML.match(regExpInner) || (i.hasAttribute('vueID') && i.getAttribute('vueID').match(regExpInner))            if(replaceList) {                if(!i.hasAttribute('vueID')) {                    i.setAttribute('vueID', i.innerHTML)                }                i.innerHTML = i.getAttribute('vueID')                replaceList.forEach(v => {                    let key = v.slice(2, v.length - 2)                    i.innerHTML = i.innerHTML.replace(v, this.$data[key])                })            }        })    }    _compile() {        this._initEvents('*', '@click', (i, key) => {            i.addEventListener('click', () => this.$methods[key].bind(this.$data)())        })        this._initEvents('input, textarea', 'v-model', (i, key) => {            i.addEventListener('input', () => {                Object.assign(this.$data, {[key]: i.value})            })        })        this._initEvents('select', 'v-model', (i, key) => {            i.addEventListener('change', () => Object.assign(this.$data, {[key]: i.options[i.options.selectedIndex].value}))        })    }}