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<!doctype html>
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<title>哈希表内建函数 - FreeMarker 手册</title>
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<h1 class="content-header header-section1" id="ref_builtins_hash" itemprop="headline">哈希表内建函数</h1>
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<div class="page-menu-title">Page Contents</div>
<ul><li><a class="page-menu-link" href="#ref_builtin_keys" data-menu-target="ref_builtin_keys">keys</a></li><li><a class="page-menu-link" href="#ref_builtin_values" data-menu-target="ref_builtin_values">values</a></li></ul> </div>
<h2 class="content-header header-section2" id="ref_builtin_keys">keys</h2>
<p>一个包含哈希表中查找到的键的序列。
请注意，并不是所有的哈希表都支持这个
(询问程序员一个指定的哈希表是否允许这么操作)。</p>
<div class="code-wrapper"><pre class="code-block code-template"><#assign h = {"name":"mouse", "price":50}>
<#assign keys = h?keys>
<#list keys as key>${key} = ${h[key]}; </#list></pre></div>
<p>将会输出：</p>
<div class="code-wrapper"><pre class="code-block code-output">name = mouse; price = 50;</pre></div>
<p>因为哈希表通常没有定义子变量的顺序，那么键名称的返回顺序就是任意的。
然而，一些哈希表维持一个有意义的顺序(询问程序员指定的哈希表是否是这样)。
比如，由上述 <code class="inline-code">{<em class="code-color">...</em>}</code>
语法创建的哈希表保存了和你指定子变量相同的顺序。</p>
<h2 class="content-header header-section2" id="ref_builtin_values">values</h2>
<p>一个包含哈希表中子变量的序列。
注意并不是所有的哈希表都支持这个
(询问程序员一个指定的哈希表是否允许这么操作)。</p>
<p>至于返回的值的顺序，和内建函数 <code class="inline-code">keys</code>
的应用是一样的；看看上面的叙述就行了。</p>
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