fix(mp-alipay): 修复支付宝默认插槽默认内容一直显示的问题 question/116404

packages/uni-template-compiler/__tests__/compiler-mp-alipay.spec.js

@@ -55,6 +55,12 @@ describe('mp:compiler-mp-alipay', () => {
       }
     )
   })
+  it('generate slot fallback content', () => {
+    assertCodegen(
+      '<view><slot>slot</slot></view>',
+      '<view><block a:if="{{$slots.$default}}"><slot></slot></block><block a:else>slot</block></view>'
+    )
+  })
   it('generate default slot', () => {
     assertCodegen(
       '<component1>text</component1>',

packages/uni-template-compiler/lib/template/traverse.js

@@ -273,6 +273,10 @@ function genSlotNode (slotName, slotNode, fallbackNodes, state) {
   if (!fallbackNodes || t.isNullLiteral(fallbackNodes)) {
     return slotNode
   }
+  // 支付宝小程序默认插槽为 $default
+  if (state.options.platform.name === 'mp-alipay') {
+    slotName = slotName === 'default' ? '$default' : slotName
+  }
   const prefix = state.options.platform.directive
   return [{
     type: 'block',