fix(mp-weixin): add for-index when for-item='index' (#3193)

packages/uni-mp-compiler/__tests__/vFor.spec.ts

@@ -32,7 +32,14 @@ describe(`compiler: v-for`, () => {
     test(`number expression`, () => {
       assert(
         `<view v-for="index in 5" />`,
-        `<view wx:for="{{a}}" wx:for-item="index"/>`,
+        `<view wx:for="{{a}}" wx:for-item="index" wx:for-index="i0"/>`,
+        `(_ctx, _cache) => {
+  return { a: _f(5, (index, k0, i0) => { return {}; }) }
+}`
+      )
+      assert(
+        `<view v-for="index of 5" />`,
+        `<view wx:for="{{a}}" wx:for-item="index" wx:for-index="i0"/>`,
         `(_ctx, _cache) => {
   return { a: _f(5, (index, k0, i0) => { return {}; }) }
 }`

packages/uni-mp-compiler/src/template/codegen.ts

@@ -123,11 +123,15 @@ function genVFor(
   node: ForElementNode,
   { push, directive }: TemplateCodegenContext
 ) {
-  const { sourceCode, valueAlias } = node.vFor
+  const { sourceCode, valueAlias, indexAlias } = node.vFor
   push(` ${directive}for="${sourceCode}"`)
+  debugger
   if (valueAlias) {
     push(` ${directive}for-item="${valueAlias}"`)
   }
+  if (valueAlias === 'index') {
+    push(` ${directive}for-index="${indexAlias}"`)
+  }
   const keyProp = findProp(node, 'key', true)
   if (keyProp) {
     const key = ((keyProp as DirectiveNode).exp as SimpleExpressionNode).content