fix: 修复H5事件为空时编译报错的问题

packages/vue-cli-plugin-uni/lib/h5/compiler-options.js

@@ -8,7 +8,7 @@ const simplePathRE = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['[^']*?']|\["[^"]
 
 function isFunction (expr) {
   try {
-    const body = parser.parse(expr).program.body[0]
+    const body = parser.parse(`(${expr})`).program.body[0]
     const expression = body.expression
     return t.isFunctionDeclaration(body) || t.isArrowFunctionExpression(expression) || t.isFunctionExpression(expression)
   } catch (error) { }
@@ -16,15 +16,14 @@ function isFunction (expr) {
 
 function processEvent (expr, filterModules) {
   const isMethodPath = simplePathRE.test(expr)
-  expr = `(${expr})`
   if (isMethodPath || isFunction(expr)) {
     if (filterModules.find(name => expr.indexOf(name + '.') === 0)) {
       return `
 $event = $handleWxsEvent($event);
-${expr}($event, $getComponentDescriptor())
+(${expr})($event, $getComponentDescriptor())
 `
     } else {
-      expr = `${expr}(...arguments)`
+      expr = `(${expr})(...arguments)`
     }
   }
   return `