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<!doctype html>
<html lang="en" class="page-type-section">
<head prefix="og: http://ogp.me/ns#">
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<title>#{...}: 数字插值 - FreeMarker 手册</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1">
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<meta property="og:title" content="#{...}: 数字插值">
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<meta property="og:url" content="http://freemarker.org/docs/ref_depr_numerical_interpolation.html">
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<link rel="icon" href="favicon.png" type="image/png">
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<div class="col-right"><div class="page-content"><div class="page-title"><div class="pagers top"><a class="paging-arrow previous" href="ref_depr_oldsyntax.html"><span>Previous</span></a><a class="paging-arrow next" href="xgui.html"><span>Next</span></a></div><div class="title-wrapper">
<h1 class="content-header header-section1" id="ref_depr_numerical_interpolation" itemprop="headline">#{...}: 数字插值</h1>
</div></div><div class="page-menu">
<div class="page-menu-title">Page Contents</div>
<ul><li><a class="page-menu-link" href="#autoid_130" data-menu-target="autoid_130">概要</a></li><li><a class="page-menu-link" href="#autoid_131" data-menu-target="autoid_131">描述</a></li></ul> </div><p>已经被废弃了：使用 <a href="ref_directive_setting.html#ref.setting.number_format"><code>number_format</code>
设置项</a> 和 <a href="ref_builtins_number.html#ref_builtin_string_for_number">the
<code>string</code> 内建函数</a> 来代替。对于计算机使用
(也就非本地的格式化)的格式化，使用 <a href="ref_builtins_number.html#ref_builtin_c"><code>c</code> 内建函数</a>
(比如 <code class="inline-code"><em class="code-color">number</em>?c</code>)。</p>
<h2 class="content-header header-section2" id="autoid_130">概要</h2>
<pre class="metaTemplate"><code class="inline-code">#{<em class="code-color">expression</em>}</code>
或
<code class="inline-code">#{<em class="code-color">expression</em>; <em class="code-color">format</em>}</code></pre>
<p>这里：</p>
<ul>
<li>
<code class="inline-code"><em class="code-color">expression</em></code>：
可以算作是数字的表达式
</li>
<li>
<code class="inline-code"><em class="code-color">format</em></code>：
可选的格式说明符
</li>
</ul>
<h2 class="content-header header-section2" id="autoid_131">描述</h2>
<p>数字插值被用来输出数值。如果表达式不能算成数字，
那么计算过程就会以抛出错误而终止。</p>
<p>可选的格式说明符指定了使用
<code class="inline-code">m<em class="code-color">min</em>M<em class="code-color">max</em></code>
语法显示的小数位数的最小和最大值。比如，<code class="inline-code">m2M5</code>
表示"最少两位，最多5位小数位"。最小值和最大值说明符部分可以被忽略。
如果仅指定最小值，那么最大值和最小值相等。如果仅指定最大值，那么最小值是0。</p>
<p>输出的小数点字符是国际化的(根据当前本地设置)，这表示它可能不是一个点。</p>
<p>不像 <code class="inline-code">${...}</code>, <code class="inline-code">#{...}</code> 忽略 <a href="ref_directive_setting.html#ref.setting.number_format"><code>number_format</code>
设置项</a>。实际上这是向后兼容的一个怪点，但是当你在如
<code class="inline-code"><a href="quertyDatabase?id=#{id}"></code>
这些情况打印数字时它可能是有用的，这里你肯定不想分组分隔符或像那些幻想的东西。
然而，从 FreeMarker 2.3.3 版本开始，而使用 <a href="ref_builtins_number.html#ref_builtin_c"><code>?c</code> 内建函数</a> 来达到这个目的，
比如 <code class="inline-code"><a href="quertyDatabase?id=${id?c}"></code>。</p>
<p>比如。假设 <code class="inline-code">x</code> 是
<code class="inline-code">2.582</code> 而 <code class="inline-code">y</code> 是
<code class="inline-code">4</code>：</p>
<div class="code-wrapper"><pre class="code-block code-template"> <#-- If the language is US English the output is: -->
#{x} <#-- 2.582 -->
#{y} <#-- 4 -->
#{x; M2} <#-- 2.58 -->
#{y; M2} <#-- 4 -->
#{x; m1} <#-- 2.6 -->
#{y; m1} <#-- 4.0 -->
#{x; m1M2} <#-- 2.58 -->
#{y; m1M2} <#-- 4.0 --></pre></div>
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