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Hook Vue3 app

通过劫持Proxy方法，逆向还原Vue3 app元素到DOM

Verzia zo dňa 12.08.2022. Pozri najnovšiu verziu.

Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://update.greasyfork.org/scripts/449444/1080855/Hook%20Vue3%20app.js 

// ==UserScript==
// @name         Hook Vue3 app
// @version      1.0.1
// @description  通过劫持Proxy方法，逆向还原Vue3 app元素到DOM
// @author       DreamNya
// @license      MIT
// @namespace https://greasyfork.org/users/809466
// ==/UserScript==

const $window = window.unsafeWindow || document.defaultView || window
const realLog = $window.console.log; //反劫持console.log
const realProxy = $window.Proxy; //劫持Proxy

var vueApp = {} //存储所有app
var vueHooked = {} //存储已还原app

$window.Proxy = function () {
    let app = arguments[0]._
    if (app && app.uid >= 0) { //判断app
        let el = app.vnode.el
        if (el) {
            if (!el.__vue__) {
                el.__vue__ = app //存在el则还原__vue__
                if (el.__vue__) {
                    recordVue(vueHooked, app)
                }
            }
        } else {
            //realLog(app,el)
            watchEl(app.vnode) //不存在el则进行观察
        }
        recordVue(vueApp, app)
    }
    return new realProxy(...arguments)
}

function watchEl(vnode) { //观察el 变动时还原到DOM
    let value = vnode.el
    let hooked = false
    Object.defineProperty(vnode, "el", {
        get() {
            return value
        },
        set(newValue) {
            if (!hooked && this.el) {
                this.el.__vue__ = this.component
                if (this.el.__vue__) {
                    hooked = true
                    recordVue(vueHooked, this.component)
                    //realLog(this.component,"已还原")
                }
            }
            value = newValue
        }
    })
}

function recordVue(obj, app) { //以uid为key存储app
    if (!obj[app.uid]) { //uid不存在则直接存储
        obj[app.uid] = app
    } else if (Array.isArray(obj[app.uid])) {
        obj[app.uid].push(app)
    } else {
        obj[app.uid] = [obj[app.uid], app] //多个root相同uid时以数组形式存储 可能存在优化空间
    }
}