通过劫持Proxy方法，逆向还原Vue3 app元素到DOM
Este script não deve ser instalado diretamente. É uma biblioteca destinada a ser incluída por outros scripts através da diretiva de metadados // @require https://update.greasyfork.org/scripts/449444/1081400/Hook%20Vue3%20app.js
// ==UserScript==
// @name Hook Vue3 app
// @version 1.0.3
// @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（大部分网站都会劫持console.log）
const realProxy = $window.Proxy; //劫持Proxy
var vueUnhooked = new WeakSet() //以WeakSet存储已获取到但未未劫持的app对象，作为debug用变量，正常情况WeakSet应为空
var vueHooked = new WeakMap() //以WeakMap存储已劫持的app对象，DOM元素为key，app对象为value
$window.Proxy = function () {
let app = arguments[0]._
if (app?.uid >= 0) { //判断app
let el = app.vnode.el
if (el) {
recordVue(el, app) //记录到WeakMap
recordDOM(el, app) //挂载到DOM
watch_isUnmounted(app) //观察销毁
} else {
//realLog(app,el)
vueUnhooked.add(app) //记录未劫持的app
//realLog(vueUnhooked,app)
watchEl(app.vnode) //不存在el则观察el
}
}
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) {
value = newValue
if (!hooked && this.el) {
hooked = true
recordVue(this.el, this.component)
recordDOM(this.el, this.component)
watch_isUnmounted(this.component)
//realLog(this.component,"已还原")
}
}
})
}
function watch_isUnmounted(app) { //观察isUnmounted 变动时销毁引用
let value = app.isUnmounted
let unhooked = false
Object.defineProperty(app, "isUnmounted", {
get() {
return value
},
set(newValue) {
value = newValue
if (!unhooked && this.isUnmounted) {
unhooked = true
//realLog(this,"已删除")
let el = this.vnode.el
if (el) {
let DOMvalue = el.__vue__ //删除DOMelement.__vue__挂载
if (DOMvalue) {
if (Array.isArray(DOMvalue)) {
let index = DOMvalue.findIndex(i => i == this)
index > -1 && DOMvalue.splice(index, 1)
el.__vue__ = DOMvalue.length > 1 ? DOMvalue : DOMvalue[0]
} else {
if (DOMvalue == this) {
el.__vue__ = void 0
}
}
}
let WMvalue = vueHooked.get(el) //删除WeakMap存储
if (WMvalue) {
if (Array.isArray(WMvalue)) {
let index = WMvalue.findIndex(i => i == this)
index > -1 && WMvalue.splice(index, 1)
vueHooked.set(el, WMvalue.length > 1 ? WMvalue : WMvalue[0])
} else {
if (WMvalue == this) {
vueHooked.delete(el)
}
}
}
}
}
}
})
}
function recordVue(el, app) { //将app记录到WeakMap中
vueUnhooked.delete(app)
if (vueHooked.has(el)) {
let value = vueHooked.get(el)
if (Array.isArray(value)) {
if (value.findIndex(i => i == app) == -1) {
vueHooked.set(el, vueHooked.get(el).push(app))
}
} else {
if (value != app) {
vueHooked.set(el, [value, app])
}
}
} else {
vueHooked.set(el, app)
}
}
function recordDOM(el, app) { //将app挂载到DOMelement.__vue__
if (el.__vue__) {
let value = el.__vue__
if (Array.isArray(value)) {
if (value.findIndex(i => i == app) == -1) {
el.__vue__ = value.push(app)
}
} else {
if (value != app) {
el.__vue__ = [value, app]
}
}
} else {
el.__vue__ = app
}
}