优化

client/shared/components/Portal/defaultEventEmitter.tsx

@@ -0,0 +1,40 @@
+export class DefaultEventEmitter {
+  // 参考: https://developer.mozilla.org/zh-CN/docs/Web/API/EventTarget
+  listeners: any = {};
+
+  emit(type: string, ...args: any[]) {
+    if (!(type in this.listeners)) {
+      return;
+    }
+    const stack = this.listeners[type];
+    for (let i = 0, l = stack.length; i < l; i++) {
+      stack[i].call(this, event);
+      const func = stack[i];
+
+      if (typeof func === 'function') {
+        func(...args);
+      }
+    }
+  }
+
+  addListener(type: string, callback: (...args: any[]) => any) {
+    if (!(type in this.listeners)) {
+      this.listeners[type] = [];
+    }
+
+    this.listeners[type].push(callback);
+  }
+
+  removeListener(type: string, callback: (...args: any[]) => any): any {
+    if (!(type in this.listeners)) {
+      return;
+    }
+    const stack = this.listeners[type];
+    for (let i = 0, l = stack.length; i < l; i++) {
+      if (stack[i] === callback) {
+        stack.splice(i, 1);
+        return this.removeListener(type, callback);
+      }
+    }
+  }
+}