测试升级为vue3

zyplayer-doc-ui/wiki-ui-2/src/utils/gogocodeTransfer.js

@@ -0,0 +1,59 @@
+const eventRegistryMap = new WeakMap()
+function getRegistry(instance) {
+  let events = eventRegistryMap.get(instance)
+  if (!events) {
+    eventRegistryMap.set(instance, (events = Object.create(null)))
+  }
+  return events
+}
+export function $on(instance, event, fn) {
+  if (Array.isArray(event)) {
+    event.forEach((e) => $on(instance, e, fn))
+  } else {
+    const events = getRegistry(instance)
+    ;(events[event] || (events[event] = [])).push(fn)
+  }
+  return instance
+}
+export function $once(instance, event, fn) {
+  const wrapped = (...args) => {
+    $off(instance, event, wrapped)
+    fn.call(instance, ...args)
+  }
+  wrapped.fn = fn
+  $on(instance, event, wrapped)
+  return instance
+}
+export function $off(instance, event, fn) {
+  const vm = instance
+  // all
+  if (!event) {
+    eventRegistryMap.set(instance, Object.create(null))
+    return vm
+  }
+  // array of events
+  if (Array.isArray(event)) {
+    event.forEach((e) => $off(instance, e, fn))
+    return vm
+  }
+  // specific event
+  const events = getRegistry(instance)
+  const cbs = events[event]
+  if (!cbs) {
+    return vm
+  }
+  if (!fn) {
+    events[event] = undefined
+    return vm
+  }
+  events[event] = cbs.filter((cb) => !(cb === fn || cb.fn === fn))
+  return vm
+}
+export function $emit(instance, event, ...args) {
+  instance && instance.$emit && instance.$emit(event, ...args)
+  const cbs = getRegistry(instance)[event]
+  if (cbs) {
+    cbs.map((cb) => cb.apply(instance, args))
+  }
+  return instance
+}