feat: 支付宝小程序平台支持onBackPress

src/platforms/mp-alipay/runtime/wrapper/page-parser.js

@@ -64,6 +64,12 @@ export default function parsePage (vuePageOptions) {
     onUnload () {
       this.$vm.__call_hook('onUnload')
       this.$vm.$destroy()
+    },
+    events: {
+      // 支付宝小程序有些页面事件只能放在events下
+      onBack(){
+          this.$vm.__call_hook('onBackPress');
+      }
     },
     __r: handleRef,
     __e: handleEvent,