fix(app): target = es6 (#3366)

packages/uni-app-vite/src/nvue/plugins/esbuild.ts

@@ -36,6 +36,7 @@ export function uniEsbuildPlugin({
     configResolved(config) {
       buildOptions = {
         format: 'iife',
+        target: 'es6',
         minify: config.build.minify ? true : false,
         banner: {
           js: `"use weex:vue";`,

packages/uni-app-vite/src/vue/plugins/renderjs.ts

@@ -131,6 +131,7 @@ function transformWxs(
   return transformWithEsbuild(code, filename, {
     format: 'iife',
     globalName,
+    target: 'es6',
     minify: isProduction ? true : false,
     bundle: true,
     write: false,
@@ -151,6 +152,7 @@ function transformRenderjs(
   return transformWithEsbuild(code, filename, {
     format: 'iife',
     globalName,
+    target: 'es6',
     minify: isProduction ? true : false,
     bundle: true,
     write: false,