Gruntjs 如何使“grunt watch”仅更新已更改的文件？

Watch工作得很好，但是，是否可以配置grunt Watch，使其不会在仅更改一个文件时循环正在监视的每个任务

对于exp my grunt文件：

module.exports = function(grunt) {

// Project configuration.
grunt.initConfig({
pkg: grunt.file.readJSON('package.json'),

watch: {
html: {
    files: ['styles/style.scss','styles/style.css','js/global.js','img/**/*.
    {png,jpg}'],
    tasks: ['sass', 'cssmin', 'uglify', 'imagemin']
}
},
sass: {        
dist: {               
    files: {                    
        'styles/style.css': 'styles/style.scss'   
    }
},
dev: {                              // another target
    options: {                      // dictionary of render options
        sourceMap: false
    },
    files: {
        'styles/style.css': 'styles/style.scss'
    }
}
},

cssmin: {
minify: {
    expand: true,
    cwd: 'styles/',
    src: ['*.css', '!*.min.css'],
    dest: 'styles/',
    ext: '.min.css'
}
},
uglify: {
build: {
    src: 'js/global.js',
    dest: 'js/build/production.min.js'
}
},

imagemin:{
  dynamic:{
  files: [{
     expand:true,
     cwd: 'img/',
     src: ['**/*.{png,jpg}'],
     dest: 'images/build'
}]
}
}
});

 // Load the plugin that provides the task that are being.
grunt.loadNpmTasks('grunt-contrib-watch');
grunt.loadNpmTasks('grunt-sass');
grunt.loadNpmTasks('grunt-contrib-cssmin');
grunt.loadNpmTasks('grunt-contrib-uglify');
grunt.loadNpmTasks('grunt-contrib-imagemin');

// Default task(s).
grunt.registerTask('default', ['watch', 'sass', 'cssmin', 'uglify', 'imagemin']);

};

例如：当我对css进行更改时；它每次运行sass、cssmin、uglify和imagemin，而不是只更改css

是否可以将grunt watch仅设置为已更改的文件？

尝试查看