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Please help me find out what's wrong?

/**
 * resouces/assets/app文件夾內(nèi)的每一個(gè)js都?jí)嚎s并保存到public/app
 * Created by summer on 2017/3/1.
 */


var gulp = require('gulp');

var gulpIf = require('gulp-if');

var uglify = require('gulp-uglify');

var elixir = require('laravel-elixir');

elixir.extend('appJs', function (src, output) {

    var inputFilePath = src || '/resources/assets/app/';
    var outputFilePath = output || '/public/app/';


    new elixir.Task('appJs', function () {
        return gulp.src(inputFilePath + '/**/*.js')
            .pipe(gulpIf(elixir.config.production, uglify()))
            .pipe(gulp.dest(outputFilePath));
    })
});

G:\xampp\htdocs\orderManage>gulp appJs
[09:32:05] Using gulpfile G:\xampp\htdocs\orderManage\gulpfile.js
[09:32:05] Starting 'appJs'...
[09:32:05] Finished 'appJs' after 11 ms

It is displayed in the console that appJs is executed, /public/app/Why is there nothing...