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docs/javascript/Reference/Global_Objects/Infinity.html
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<h2 id="Syntax" name="Syntax">语法</h2>
<pre class="syntaxbox"><code>Infinity </code></pre>
<pre><code class="language-javascript"><code>Infinity </code></code></pre>
<h2 id="Description" name="Description">描述</h2>
<p><code>Infinity</code> 是全局对象（<em>global object</em>）的一个属性，即它是一个全局变量。</p>
<p><code>Infinity</code> 的初始值是 <a href="Reference/Global_Objects/Number/POSITIVE_INFINITY" title="Number.POSITIVE_INFINITY 属性表示正无穷大。"><code>Number.POSITIVE_INFINITY</code></a>。<code>Infinity</code>（正无穷大）大于任何值。该值和数学意义上的无穷大很像，例如任何正值乘以 <code>Infinity</code> 为 <code>Infinity</code>, 任何数值（除了Infinity 和 -Infinity）除以 <code>Infinity</code> 为 0。</p>
<p>在 ECMAScript 5 的规范中， <code>Infinity</code> 是只读的（实现于 JavaScript 1.8.5 / Firefox 4）。</p>
<h2 id="示例">示例</h2>
<pre class="brush: js line-numbers language-js"><code class="language-js">console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="number token">Infinity</span> <span class="punctuation token">)</span><span class="punctuation token">;</span> <span class="comment token">/* Infinity */</span>
<pre><code class="language-javascript"><code class="language-js">console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="number token">Infinity</span> <span class="punctuation token">)</span><span class="punctuation token">;</span> <span class="comment token">/* Infinity */</span>
console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="number token">Infinity</span> <span class="operator token">+</span> <span class="number token">1</span> <span class="punctuation token">)</span><span class="punctuation token">;</span> <span class="comment token">/* Infinity */</span>
console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span>Math<span class="punctuation token">.</span><span class="function token">pow</span><span class="punctuation token">(</span><span class="number token">10</span><span class="punctuation token">,</span> <span class="number token">1000</span><span class="punctuation token">)</span><span class="punctuation token">)</span><span class="punctuation token">;</span> <span class="comment token">/* Infinity */</span>
console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span>Math<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="number token">0</span><span class="punctuation token">)</span> <span class="punctuation token">)</span><span class="punctuation token">;</span> <span class="comment token">/* -Infinity */</span>
console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="number token">1</span> <span class="operator token">/</span> <span class="number token">Infinity</span> <span class="punctuation token">)</span><span class="punctuation token">;</span> <span class="comment token">/* 0 */</span></code></pre>
console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span><span class="number token">1</span> <span class="operator token">/</span> <span class="number token">Infinity</span> <span class="punctuation token">)</span><span class="punctuation token">;</span> <span class="comment token">/* 0 */</span></code></code></pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>