fix(mp): arguments for event handlers #1796

src/core/runtime/wrapper/util.js

@@ -372,6 +372,12 @@ function processEventExtra (vm, extra, event) {
         } else {
           if (dataPath === '$event') { // $event
             extraObj['$' + index] = event
+          } else if (dataPath === 'arguments') {
+            if (event.detail && event.detail.__args__) {
+              extraObj['$' + index] = event.detail.__args__
+            } else {
+              extraObj['$' + index] = [event]
+            }
           } else if (dataPath.indexOf('$event.') === 0) { // $event.target.value
             extraObj['$' + index] = vm.__get_value(dataPath.replace('$event.', ''), event)
           } else {
@@ -533,4 +539,4 @@ export function handleEvent (event) {
   ) {
     return ret[0]
   }
-}
+}