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Pug原名不叫Pug,原来是大名鼎鼎的jade,后来由于商标的原因,改为Pug,哈巴狗。以下是官方解释:

it has been revealed to us that "Jade" is a registered trademark, and as a result a rename is needed. After some discussion among the maintainers, "Pug" has been chosen as the new name for this project.

其实只是换个名字,语法都与jade一样。

1. Pug安装编译的二三事

开始安装之后

npm install -g pug

运行一下代码

pug index.pug

结果显示:

bash: pug: command not found

找了网上很多内容和教程,大部分都是关于jade的,去Github看了一下官方的讨论区,才知道

You need to install pug-cli. The CLI was separated from the core library as part of this release.

所以,成功解决问题

npm install -g pug-cli

详情请看:pug: command not found

二. 代码编辑器优化

  1. sublime,可以在package control->install package中安装pug
  2. webStrom,如果出现Invalid indentation,you can use tabs or spaces but not both错误,可以参考这篇文章[Jade报错:Invalid indentation,you can use tabs or spaces but not both问题

](http://blog.csdn.net/greenqin... PS:学生可以凭借edu邮箱免费使用正版

三. 基础语法知识

一段简单的代码

doctype html
html
    head
            title hello pug 
    body
        h1 pug pug

使用命令:

pug -P -w index.pug

编译后的结果为:

<!DOCTYPE html>
<html>
  <head>
    <title>hello pug </title>
  </head>
  <body>
    <h1>pug pug</h1>
  </body>
</html>

1.类名和ID名

a.button
a(class="button")

编译后:

<a class="button"></a>
<a class="button"></a>

ID类似

2.属性

属性可以使用()包裹起来,属性值之间用逗号隔开
比如

a(href="google.com",title="google")

3.文本内容

a(href="google.com",title="google") Hello World

多行文本内容

p.
    asdfasdfa
    asdfasd
    adsfasd
    asdfasdfa

或者

p
    | dfas
    | dfas
    | dfas

文本含有标签

p
    | dfas <strong>hey</strong>
    | dfas
    | dfas

或者

p
    | dfas <strong>hey</strong>
        strong hey man
    | dfas
    | dfas

4.注释

a. 单行注释

// just some paragraphs
<!-- just some paragraphs-->

b. 非缓冲注释

//- will not output within markup

不会被编译到HTML
c. 块注释

第一种
body
  //
    As much text as you want
    can go here.
第二种   
<body>
  <!--
  As much text as you want
  can go here.
  -->
</body>

d. IE注释

<!--[if IE 8]><html class='ie8'><[endif]-->
<!--[if IE 9]><html class='ie9'><[endif]-->
<!--[if IE ]><html class='ie8'><[endif]-->

5.变量

-var Pug="hello world"
 title #{Pug}

转义

-var htmlData='<strong>sdf</strong>'
p#{htmlData}
p!=htmlData

非转义

-var htmlData='<strong>sdf</strong>'
p !{htmlData}
p=htmlData

编译前的代码

p \#{htmlData}
p \!{htmlData}

没有的变量赋值

p=data;

是空值而不是undefined

6.流程代码

-var array=[1,2,3,4]
-for (var k in imooc)
    p=array[k]
-each k in array
    p:#{k}
-while
-var array=[1,2]
        if array.length>2
            p true
        else
            p false

unless 为false,才执行,用法与if类似

-var array=[1,2]
        unless    !istrue
            p hello

switch的功能

        -var name='java'
        case name
            when 'java': p Hi,java
        case name
            when 'pug': p Hi,pug
        default
            p Hi

7.mixins

1.重复的代码块

mixin sayHi
    p hello everyone
+sayHi

编译后

<p>hello everyone</p>

2.传入参数

mixin pet(name)
  li.pet= name
ul
  +pet('cat')

3.blocks

mixin article(title)
  .article
      h1= title
      if block //是否有包含内容
        block
      else
        p No content provided
+article('Hello world')
+article('Hello world')
  p This is my

编译后:

<!--如果节点里面没有内容,就加上-->
<div class="article">
    <h1>Hello world</h1>
    <p>No content provided</p>
</div>
<div class="article">
    <h1>Hello world</h1>
    <p>This is my</p>
    <p>Amazing article</p>
</div>

4.Attributes

mixin link(href, name)
  //- attributes == {class: "btn"}
  a(class!=attributes.class, href=href)= name

+link('/foo', 'foo')(class="btn")

attributes已经转义,所以应该使用!=避免二次转义
编译后:

<a href="/foo" class="btn">foo</a>

5.不确定参数

mixin list(id, ...items)
  ul(id=id)
    each item in items
      li= item

+list('my-list', 1, 2, 3, 4)

参数中要加入...,编译后:

<ul id="my-list">
  <li>1</li>
  <li>2</li>
  <li>3</li>
  <li>4</li>
</ul>

四.参考资料

  1. jade-lang
  2. Github·Pub
  3. Scott 《带你学习Jade模板引擎》

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