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grunt.registerTask('default',['concurrent']);

你配置的最后一行應該是：

grunt.registerTask('default',['concurrent:target']);

不知道你的問題有沒有解決 我也遇到了一樣的問題：

這是完整的配置代碼：

module.exports?=?function(grunt)?{

??grunt.initConfig({
????watch:?{
??????jade:?{
????????files:?['views/**'],
????????options:?{
??????????livereload:?true
????????}
??????},
??????js:?{
????????files:?['public/js/**',?'models/**/*.js',?'schemas/**/*.js'],
????????//tasks:?['jshint'],
????????options:?{
??????????livereload:?true
????????}
??????},
??????uglify:?{
????????files:?['public/**/*.js'],
????????tasks:?['jshint'],
????????options:?{
??????????livereload:?true
????????}
??????},
??????styles:?{
????????files:?['public/**/*.less'],
????????tasks:?['less'],
????????options:?{
??????????nospawn:?true
????????}
??????}
????},

????jshint:?{
??????options:?{
????????jshintrc:?'.jshintrc',
????????ignores:?['public/libs/**/*.js']
??????},
??????all:?['public/js/*.js',?'test/**/*.js',?'app/**/*.js']
????},

????less:?{
??????development:?{
????????options:?{
??????????compress:?true,
??????????yuicompress:?true,
??????????optimization:?2
????????},
????????files:?{
??????????'public/build/index.css':?'public/less/index.less'
????????}
??????}
????},

????uglify:?{
??????development:?{
????????files:?{
??????????'public/build/admin.min.js':?'public/js/admin.js',
??????????'public/build/detail.min.js':?[
????????????'public/js/detail.js'
??????????]
????????}
??????}
????},

????nodemon:?{
??????dev:?{
????????options:?{
??????????file:?'app.js',
??????????args:?[],
??????????ignoredFiles:?['README.md',?'node_modules/**',?'.DS_Store'],
??????????watchedExtensions:?['js'],
??????????watchedFolders:?['./'],
??????????debug:?true,
??????????delayTime:?1,
??????????env:?{
????????????PORT:?3000
??????????},
??????????cwd:?__dirname
????????}
??????}
????},

????mochaTest:?{
??????options:?{
????????reporter:?'spec'
??????},
??????src:?['test/**/*.js']
????},

????concurrent:?{
??????tasks:?['nodemon',?'watch',?'less',?'uglify',?'jshint'],
??????options:?{
????????logConcurrentOutput:?true
??????}
????}
??})

??grunt.loadNpmTasks('grunt-contrib-watch')
??grunt.loadNpmTasks('grunt-nodemon')
??grunt.loadNpmTasks('grunt-concurrent')
??grunt.loadNpmTasks('grunt-mocha-test')
??grunt.loadNpmTasks('grunt-contrib-less')
??grunt.loadNpmTasks('grunt-contrib-uglify')
??grunt.loadNpmTasks('grunt-contrib-jshint')

??grunt.option('force',?true)

??grunt.registerTask('default',?['concurrent'])

??grunt.registerTask('test',?['mochaTest'])
}

我已經按照你的方法執行了，但報錯還是存在。

這是我的Gruntfile.js配置內容:

module.exports?=?function(grunt)?{
????grunt.initConfig({
????????watch?:?(省略),
????????nodemon?:?(省略),?
????????concurrent:?{
??????????target:?{
????????????tasks:?['nodemon',?'watch'],
????????????options:?{
??????????????logConcurrentOutput:?true
????????????}
??????????}
????????}
????})
????
????grunt.loadNpmTasks('grunt-contrib-watch');
????grunt.loadNpmTasks('grunt-nodemon');
????grunt.loadNpmTasks('grunt-concurrent');
????
????grunt.option('force',true);
????grunt.registerTask('default',['concurrent']);
}

但是不管我在npm里執行grunt，還是grunt concurrent。都報錯No "concurrent" targets found.

npm install?grunt-concurrent --save

留意一下，是否能安裝成功。

直接?grunt concurrent 是需要你先注冊，也就是?registerTask 一個 grunt task 名字，然后才能在命令行里調用