fix(Popup): memory leak issue (#9336)

* fix: 修复弹框组件内存泄漏问题

* fix: es5兼容

Co-authored-by: qiuhuibin <qiuhuibin@bigo.sg>

src/mixins/popup/context.ts

@@ -13,4 +13,12 @@ export const context = {
   find(vm: any): StackItem | undefined {
     return this.stack.filter((item) => item.vm === vm)[0];
   },
+  remove: function remove(vm: any) {
+    const item = this.find(vm);
+    if(!item) return;
+    item.vm = null;
+    item.overlay = null;
+    const index = this.stack.indexOf(item);
+    this.stack.splice(index, 1);
+  },
 };

src/mixins/popup/overlay.ts

@@ -73,5 +73,6 @@ export function removeOverlay(vm: any) {
   const item = context.find(vm);
   if (item) {
     removeNode(item.overlay.$el);
+    context.remove(vm);
   }
 }