correct the error translate in enum
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@ -46,7 +46,7 @@
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<div class="book" data-level="2.17" data-basepath=".." data-revision="1402322774243">
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<div class="book" data-level="2.17" data-basepath=".." data-revision="1402323563628">
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<div class="book-header">
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<!-- Actions Left -->
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<a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
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@ -587,7 +587,7 @@
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<div class="page-inner">
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<section class="normal" id="section-gitbook_164">
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<section class="normal" id="section-gitbook_315">
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<h1 id="optional-chaining">Optional Chaining</h1>
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<p>可选链(Optional Chaining)是一种可以请求和调用属性、方法及子脚本的过程,它的自判断性体现于请求或调用的目标当前可能为空(<code>nil</code>)。如果自判断的目标有值,那么调用就会成功;相反,如果选择的目标为空(<code>nil</code>),则这种调用将返回空(<code>nil</code>)。多次请求或调用可以被链接在一起形成一个链,如果任何一个节点为空(<code>nil</code>)将导致整个链失效。</p>
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