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2014-06-09 12:12:20 +08:00
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chapter2/12_Subscripts.html
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<div class="book" data-level="2.12" data-basepath=".." data-revision="1402267410054">
<div class="book" data-level="2.12" data-basepath=".." data-revision="1402287112409">
<div class="book-header">
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<div class="page-inner">
<section class="normal" id="section-gitbook_29">
<section class="normal" id="section-gitbook_61">
<h1 id="-subscripts-">下标 (Subscripts)</h1>
<p>下标可以定义在类(Class)、结构体(structures)和枚举(enumerations)这些目标中，可以认为是访问对象、集合或序列的快捷方式。举例来说，用下标访问一个数组(Array)实例中的元素可以这样写 <code>someArray[index]</code> ，访问字典(Dictionary)实例中的元素可以这样写 <code>someDictionary[key]</code>，而不需要再调用实例的某个方法来获得元素的值。</p>