update underscore

This commit is contained in:
numbbbbb
2014-06-10 20:07:44 +08:00
parent 930d81867c
commit 9af353f0fc
41 changed files with 103 additions and 80 deletions

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<div class="book" data-level="3.1" data-basepath=".." data-revision="1402397411238">
<div class="book" data-level="3.1" data-basepath=".." data-revision="1402402017737">
<div class="book-header">
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<div class="page-inner">
<section class="normal" id="section-gitbook_52">
<section class="normal" id="section-gitbook_70">
<h1 id="-">关于语言附注</h1>
<hr>
<p>本书的这一节描述了Swift编程语言的形式语法。这里描述的语法是为了帮助您更详细的了解该语言而不是让您直接实现一个解析器或编译器。</p>
<p>Swift语言相对小点这是由于在Swift代码中几乎无处不在的许多常见的的类型函数以及运算符都由Swift标准库来定义。虽然这些类型函数和运算符不是Swift语言本身的一部分但是它们被广泛用于这本书的讨论和代码范例。</p>
<h1 id="-">如何阅读语法</h1>

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<div class="book" data-level="3.2" data-basepath=".." data-revision="1402397411238">
<div class="book" data-level="3.2" data-basepath=".." data-revision="1402402017737">
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<div class="page-inner">
<section class="normal" id="section-gitbook_58">
<section class="normal" id="section-gitbook_77">
<h1 id="-">语法结构</h1>
<hr>
<p>本页包含内容:</p>
<ul>
<li>空白与注释(<em>Whitespace and Comments</em></li>

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<div class="book" data-level="3.3" data-basepath=".." data-revision="1402397411238">
<div class="book" data-level="3.3" data-basepath=".." data-revision="1402402017737">
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<div class="page-inner">
<section class="normal" id="section-gitbook_53">
<section class="normal" id="section-gitbook_72">
<h1 id="-types-">类型Types</h1>
<hr>

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<div class="book" data-level="3.4" data-basepath=".." data-revision="1402397411238">
<div class="book" data-level="3.4" data-basepath=".." data-revision="1402402017737">
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<div class="page-inner">
<section class="normal" id="section-gitbook_55">
<section class="normal" id="section-gitbook_74">
<h1 id="-expressions-">表达式(Expressions)</h1>
<hr>

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<div class="book" data-level="3.6" data-basepath=".." data-revision="1402397411238">
<div class="book" data-level="3.6" data-basepath=".." data-revision="1402402017737">
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<div class="book" data-level="3.7" data-basepath=".." data-revision="1402397411238">
<div class="book" data-level="3.7" data-basepath=".." data-revision="1402402017737">
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<div class="page-inner">
<section class="normal" id="section-gitbook_51">
<section class="normal" id="section-gitbook_68">
<h1 id="-">特性</h1>
<hr>
<p>特性提供了关于声明和类型的更多信息。在Swift中有两类特性用于修饰声明的以及用于修饰类型的。例如<code>required</code>特性,当应用于一个类的指定或便利初始化器声明时,表明它的每个子类都必须实现那个初始化器。再比如<code>noreturn</code>特性,当应用于函数或方法类型时,表明该函数或方法不会返回到它的调用者。</p>
<p>通过以下方式指定一个特性:符号<code>@</code>后面跟特性名,如果包含参数,则把参数带上:</p>
<pre><code>@attribute name

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<div class="book" data-level="3.8" data-basepath=".." data-revision="1402397411238">
<div class="book" data-level="3.8" data-basepath=".." data-revision="1402402017737">
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<div class="page-inner">
<section class="normal" id="section-gitbook_59">
<section class="normal" id="section-gitbook_79">
<h1 id="-patterns-">模式Patterns</h1>
<hr>
<p>模式pattern代表了单个值或者复合值的结构。例如元组<code>(1, 2)</code>的结构是逗号分隔的,包含两个元素的列表。因为模式代表一种值的结构,而不是特定的某个值,你可以把模式和各种同类型的值匹配起来。比如,<code>(x, y)</code>可以匹配元组<code>(1, 2)</code>,以及任何含两个元素的元组。除了将模式与一个值匹配外,你可以从合成值中提取出部分或全部,然后分别把各个部分和一个常量或变量绑定起来。</p>
<p>在Swift中模式出现在变量和常量的声明在它们的左侧<code>for-in</code>语句和<code>switch</code>语句在他们的case标签中。尽管任何模式都可以出现在<code>switch</code>语句的case标签中但在其他情况下只有通配符模式wildcard pattern标识符模式identifier pattern和包含这两种模式的模式才能出现。</p>
<p>你可以为通配符模式wildcard pattern标识符模式identifier pattern和元组模式tuple pattern指定类型注释用来限制这种模式只匹配某种类型的值。</p>

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<div class="book" data-level="3.9" data-basepath=".." data-revision="1402397411238">
<div class="book" data-level="3.9" data-basepath=".." data-revision="1402402017737">
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<div class="page-inner">
<section class="normal" id="section-gitbook_60">
<section class="normal" id="section-gitbook_81">
<h1 id="-">泛型参数</h1>
<hr>

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<div class="book" data-level="3.10" data-basepath=".." data-revision="1402397411238">
<div class="book" data-level="3.10" data-basepath=".." data-revision="1402402017737">
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<div class="page-inner">
<section class="normal" id="section-gitbook_63">
<section class="normal" id="section-gitbook_86">
<h1 id="-">语法总结</h1>
<hr>
<p>本页包含内容:</p>
<ul>
<li><a href="#label1">语句Statements</a></li>

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<div class="book" data-level="3.5" data-basepath=".." data-revision="1402397411238">
<div class="book" data-level="3.5" data-basepath=".." data-revision="1402402017737">
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<div class="page-inner">
<section class="normal" id="section-gitbook_62">
<section class="normal" id="section-gitbook_83">
<h1 id="-">语句</h1>
<hr>
<p>在 Swift 中有两种类型的语句简单语句和控制流语句。简单语句是最常见的用于构造表达式和声明。控制流语句则用于控制程序执行的流程Swift 中有三种类型的控制流语句:循环语句、分支语句和控制传递语句。</p>
<p>循环语句用于重复执行代码块;分支语句用于执行满足特定条件的代码块;控制传递语句则用于修改代码的执行顺序。在稍后的叙述中,将会详细地介绍每一种类型的控制流语句。</p>
<p>是否将分号(;)添加到语句的结尾处是可选的。但若要在同一行内写多条独立语句,请务必使用分号。</p>

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