fix(mp): 修复 v-for 中含有复杂表达式时，事件接收的 item 参数错误的问题

packages/uni-template-compiler/__tests__/compiler-extra.spec.js

@@ -737,6 +737,16 @@ describe('mp:compiler-extra', () => {
       '<block wx:for="{{$root.l0}}" wx:for-item="item" wx:for-index="index"><view><view data-event-opts="{{[[\'tap\',[[\'e0\',[\'$event\']]]]]}}" data-event-params="{{({item})}}" bindtap="__e"></view></view></block>',
       'with(this){var l0=array();if(!_isMounted){e0=function($event,item){var _temp=arguments[arguments.length-1].currentTarget.dataset,_temp2=_temp.eventParams||_temp["event-params"],item=_temp2.item;var _temp,_temp2;return test(item)}}$mp.data=Object.assign({},{$root:{l0:l0}})}'
     )
+    assertCodegen(
+      '<view v-for="(item, index) in array()"><view @click="test(item)">{{item}}</view></view>',
+      '<block wx:for="{{$root.l0}}" wx:for-item="item" wx:for-index="index"><view><view data-event-opts="{{[[\'tap\',[[\'e0\',[\'$event\']]]]]}}" data-event-params="{{({item})}}" bindtap="__e">{{item}}</view></view></block>',
+      'with(this){var l0=array();if(!_isMounted){e0=function($event,item){var _temp=arguments[arguments.length-1].currentTarget.dataset,_temp2=_temp.eventParams||_temp["event-params"],item=_temp2.item;var _temp,_temp2;return test(item)}}$mp.data=Object.assign({},{$root:{l0:l0}})}'
+    )
+    assertCodegen(
+      '<view v-for="(item, index) in array()"><view @click="test(item)">{{get(item)}}</view></view>',
+      '<block wx:for="{{$root.l0}}" wx:for-item="item" wx:for-index="index"><view><view data-event-opts="{{[[\'tap\',[[\'e0\',[\'$event\']]]]]}}" data-event-params="{{({item:item.$orig})}}" bindtap="__e">{{item.m0}}</view></view></block>',
+      'with(this){var l0=__map(array(),function(item,index){var $orig=__get_orig(item);var m0=get(item);return{$orig:$orig,m0:m0}});if(!_isMounted){e0=function($event,item){var _temp=arguments[arguments.length-1].currentTarget.dataset,_temp2=_temp.eventParams||_temp["event-params"],item=_temp2.item;var _temp,_temp2;return test(item)}}$mp.data=Object.assign({},{$root:{l0:l0}})}'
+    )
   })
   it('generate bool attr', () => {
     assertCodegen(

packages/uni-template-compiler/lib/script/traverse/data/event.js

@@ -520,8 +520,7 @@ module.exports = function processEvent (paths, path, state, isComponent, tagName
     ret.push(
       t.objectProperty(
         t.stringLiteral(ATTR_DATA_EVENT_PARAMS),
-        // 直接使用对象格式微信小程序编译会报错
-        t.stringLiteral(`{{({${params.join(',')}})}}`)
+        t.objectExpression(params.map(param => t.objectProperty(t.identifier(param), t.identifier(param), false, true)))
       )
     )
   }