Yo scaffolds out a new application, writing your Grunt configuration and pulling in relevant Grunt tasks that you might need for your build.
Grunt is used to build, preview and test your project, thanks to help from tasks curated by the Yeoman team and grunt-contrib.
Bower is used for dependency management, so that you no longer have to manually download and manage your scripts.

简单来说就是 Yo 是配置 Grunt 的 task 的工具，Grunt 是一个部署、预览和测试前端项目的工具，而 Bower 是一个包的管理工具，可以下载 jquery, backbone 等库。

PS: 要运行 yeoman 首先需要配置环境，配置好 node.js 、git 环境。

下面开始写一个 todo-list demo 作为例子

一、首先安装 yo，这会自动安装 grunt, bower

npm install -g yo
npm install -g generator-webapp

PS: yo 是命令开头，webapp 是另外一个参数. yo 可以生成其他各种应用配置。如 backbone, angularjs等，前提首先安装 generator-backbone，即

yo webapp

此时可以看到

webapp 默认带有 Sass 版的 bootstrap库，等到下载完毕后可以看到以下文件：

node_modules 为 nodejs的包文件

test 为测试目录，专门用于单元测试，用的是 mocha 来测试

Gruntfile.js 是配置 grunt 自动化任务的配置文件，具体配置可以参考下 Grunt官网

二、添加JS库，这里添加 backbone，bower 会自动下载 underscore.

bower install backbone

三、运行

grunt server

它将运行应用，并监控文件的变化，一旦有改变，就会自动刷新浏览器。

文件又这几个，用的是

HTML5 Boilerplate 模板（默认）
RequireJS （可选）

四、开始写应用

index.html

View Code

<!doctype html>



 <html class="no-js"> 
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title></title>
<meta name="description" content="">
<meta name="viewport" content="width=device-width">


<link rel="stylesheet" href="styles/bootstrap-2.3.2.min.css">
<link rel="stylesheet" href="styles/main.css">


<script src="bower_components/modernizr/modernizr.js"></script>

</head>
<body>
<div class="container">
<div class="todo-container">
<div class="header">
<h2>Todo List</h2>
<div class="todo-input">
<div class="controls">
<input type="text" placeholder="Enter to save" class="todo-input-text" autofocus>
</div>
</div>
</div>
<div class="content">
<div class="todo-item-list todo-undone-list clearfix">
<p>Things to do:</p>
</div>
<div class="todo-item-list todo-done-list clearfix">
<p>Done Things:</p>
</div>
</div>
<div class="footer">
</div>
</div>
</div>

<script data-main="scripts/main" src="bower_components/requirejs/require.js"></script>

</body>
</html>

main.coffee

View Code

require.config
baseUrl : './scripts/'
shim :
underscore :
exports : '_'
backbone :
deps : [
'underscore'
'jquery'
]
exports : 'Backbone'
backboneLocalStorage :
deps : [
'backbone'
]
app :
deps : [
'underscore'
'jquery'
'backbone'
]

paths :
jquery : '../bower_components/jquery/jquery'
underscore : '../bower_components/underscore/underscore'
backbone : '../bower_components/backbone/backbone'
backboneLocalStorage: '../bower_components/backbone/examples/backbone.localStorage'

require ['app'], (app) ->
app.init()

app.coffee

View Code

define 'app', ['jquery', 'underscore', 'backbone', 'backboneLocalStorage'], ($, _, Backbone) ->

TodoModel = Backbone.Model.extend
defaults : () ->
title : 'Untitle',
done : false,
order : Todos.length+1

initialize : () ->
this.save()

TodoList = Backbone.Collection.extend
model : TodoModel
localStorage : new Backbone.LocalStorage 'todos-backbone'
done : () ->
this.where done : true

Todos = new TodoList # todo 集合

TodoView = Backbone.View.extend
tagName : 'div' # 外容器
template : _.template $('#todo-item-template').html() # 模板HTML

# 初始化，坚听对象
initialize : () ->
this.listenTo this.model, 'change', this.render
this.listenTo this.model, 'destroy', this.remove

# 事件绑定
events :
'click button.todo-item-done' : 'done'
'click button.todo-item-remove' : 'clear'
'click button.todo-item-undone' : 'undone'

done : () ->
if this.model.get('done') == false # 本身是未完成状态的
this.model.set done : true
this.remove()

undone : () ->
if this.model.get('done') == true # 本身是完成状态的
this.model.set done : false
this.remove()

clear : () ->
this.model.destroy()

render : () ->
this.$el.html this.template this.model.toJSON()
return this

AppView = Backbone.View.extend
# 初始化保存DOM对象
initialize : () ->
this.$input = this.$('.todo-input-text').focus()
this.$todoList = this.$('.todo-undone-list')
this.$todoDoneList = this.$('.todo-done-list')

this.listenTo Todos, 'add', this.addOne
this.listenTo Todos, 'change:done', this.addOne

Todos.fetch()

events :
'keypress input.todo-input-text' : 'createOnEnter'

# Enter 时保存
createOnEnter : (e) ->
if e.keyCode != 13
return
if !this.$input.val()
return;

Todos.create title: this.$input.val()
this.$input.val('')

addOne : (todo) ->
view = new TodoView model : todo
if todo.get('done')
# 已经完成的加入已完成列表
this.$todoDoneList.append(view.render().el);
else
# 未完成的加入未完成列表
this.$todoList.append(view.render().el);

# Todos.each (todo) ->
todo.save()

App = new AppView el : $('.todo-container') # 主应用UI

return init : () ->
Backbone.history.start()

main.css

View Code

.todo-container {
margin: 50px auto 0 auto;
width: 300px;
}
.todo-item-list {
margin-top: 20px;
}
.todo-item-list > div {
float: left;
width: 90%;
margin-top: 10px;
padding-left: 5%;
}
.todo-item-list > div a:hover {
text-decoration: none;
}
.todo-item-list > div button {
margin: 0 3px;
}
.todo-item-list > div span.order {
margin-right: 10px;
color: #B6B6B6;
font-style: italic;
}
.todo-item-list > p {
font-weight: bold;
margin-top: 1em;
}