diff --git a/task/smartjs.js b/task/smartjs.js
index df8a6da..7fcafa0 100644
--- a/task/smartjs.js
+++ b/task/smartjs.js
@@ -47,7 +47,7 @@ class JSWorker {
   }
 
   startWatch() {
-    gulp.watch(this.watch, gulp.series(this.taskName))
+    gulp.watch([this.watch, ...this.files], gulp.parallel([this.taskName]));
   }
 
   get taskName() {
@@ -62,10 +62,9 @@ class JSWorker {
   }
 
   work() {
-    let d = gulp.src(this.files)
+    let d = gulp.src(this.files).pipe(concat(this.config.name + '.js'))
     if (!this.config.onlyMinify) {
-      d.pipe(concat(this.config.name + '.js'))
-        .pipe(gulp.dest(this.path.dir));
+        d.pipe(gulp.dest(this.path.dir));
     }
     if (this.config.minify) {
       d.pipe(closureCompiler(this.compiler)).pipe(gulp.dest(this.path.dir));