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10
docs/javascript/Reference/Global_Objects/Math/trunc.html
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@@ -2,7 +2,7 @@
<div></div>
<p><code><strong>Math.trunc()</strong></code> 方法会将数字的小数部分去掉，只保留整数部分。</p>
<h2 id="Syntax" name="Syntax">语法</h2>
<pre class="syntaxbox">Math.trunc(<em>value</em>)</pre>
<pre><code class="language-javascript">Math.trunc(<em>value</em>)</code></pre>
<h3 id="Parameters" name="Parameters">参数</h3>
<dl>
<dt><code>value</code></dt>
@@ -15,14 +15,14 @@
<p>传入该方法的参数会被隐式转换成数字类型。</p>
<p>因为 <code>trunc()</code> 是 <code>Math</code> 对象的静态方法，你必须用 <code>Math.trunc()</code> 来使用，而不是调用你创建的 <code>Math</code> 对象的一个实例方法（<code>Math</code> 没有构造函数）</p>
<h2 id="Examples" name="Examples">示例</h2>
<pre class="brush:js">Math.trunc(13.37) // 13
<pre><code class="language-js">Math.trunc(13.37) // 13
Math.trunc(42.84) // 42
Math.trunc(0.123) // 0
Math.trunc(-0.123) // -0
Math.trunc("-1.123") // -1
Math.trunc(NaN) // NaN
Math.trunc("foo") // NaN
Math.trunc() // NaN</pre>
Math.trunc() // NaN</code></pre>
<h2 id="Polyfill">Polyfill</h2>
<pre><code>if (!Math.trunc) {
Math.trunc = function(v) {
@@ -44,14 +44,14 @@ Math.trunc() // NaN</pre>
// null -&gt; 0
};
}</code>
</pre>
</code></pre>
<p>或:</p>
<pre><code>if (!Math.trunc) {
Math.trunc = function(v) {
v = +v;
return (v - v % 1) || (!isFinite(v) || v === 0 ? v : v &lt; 0 ? -0 : 0);
};
}</code></pre>
}</code></code></pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>