摘要：原文地址的博客點(diǎn)擊在線嘗試一下最終效果如下構(gòu)造器構(gòu)造一個(gè)對(duì)象，包含基本的，，初始化編譯器用于解析綁定到輸入框和下拉框的和元素的點(diǎn)擊事件。

原文地址：Bougie的博客

點(diǎn)擊在線嘗試一下

最終效果如下：

構(gòu)造一個(gè)TinyVue對(duì)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()
    }
}

用于解析綁定到輸入框和下拉框的v-model和元素的點(diǎn)擊事件@click。
先創(chuàng)建一個(gè)函數(shù)用來(lái)載入事件：

// el為元素tagName，attr為元素屬性（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)
        }
    })
}

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}))
})

點(diǎn)擊事件對(duì)應(yīng)的是methods中的事件

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

同理先創(chuàng)建公共函數(shù)來(lái)處理不同元素中的視圖，包括input、textarea的value，select的選擇值，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)
        }
    })
}

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")
    })
})

這里實(shí)現(xiàn)方法有點(diǎn)low，僅想到正則替換{{text}}

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])
        })
    }
})

數(shù)據(jù)變化之后更新視圖

_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()
                }
            }
        })
    })
}

    

    

    

    加一
    
您輸入的是：{{text1}}+{{text2}}+{{text3}}
    
        Volvo
        Saab
    
    
        Volvo
        Saab
    
    
您選擇了：{{select}}

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}))
        })
    }
}