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diff --git a/files/zh-tw/web/javascript/reference/global_objects/infinity/index.html b/files/zh-tw/web/javascript/reference/global_objects/infinity/index.html new file mode 100644 index 0000000000..147914eea7 --- /dev/null +++ b/files/zh-tw/web/javascript/reference/global_objects/infinity/index.html @@ -0,0 +1,76 @@ +--- +title: Infinity +slug: Web/JavaScript/Reference/Global_Objects/Infinity +translation_of: Web/JavaScript/Reference/Global_Objects/Infinity +--- +<div>{{jsSidebar("Objects")}}</div> + +<p>全域 <code><strong>Infinity</strong></code> 屬性是一個表示無窮大的數值。</p> + +<p>{{js_property_attributes(0,0,0)}}</p> + +<h2 id="語法">語法</h2> + +<pre class="syntaxbox"><code>Infinity </code></pre> + +<h2 id="描述">描述</h2> + +<p><code>Infinity</code> 是全域物件屬性,即它是全域範圍內的變數。</p> + +<p><code>Infinity</code> 的初始值是 {{jsxref("Number.POSITIVE_INFINITY")}} <code>Infinity</code> 值(正無窮大)值大於其他任何數值。該值在數學上表現為無窮大。例如,任何乘以 <code>Infinity</code> 的正整數都是 <code>Infinity</code>,除以 <code>Infinity</code> 的任何數都是 0。</p> + +<p>按照 ECMAScript 5 規範,在 JavaScript 1.8.5 / Firefox 4 實作的 <code>Infinity</code> 乃唯讀屬性。</p> + +<h2 id="範例">範例</h2> + +<pre class="brush: js">console.log(Infinity ); /* Infinity */ +console.log(Infinity + 1 ); /* Infinity */ +console.log(Math.pow(10,1000)); /* Infinity */ +console.log(Math.log(0) ); /* -Infinity */ +console.log(1 / Infinity ); /* 0 */ +</pre> + +<h2 id="規範">規範</h2> + +<table class="standard-table"> + <tbody> + <tr> + <th scope="col">規範</th> + <th scope="col">狀態</th> + <th scope="col">註解</th> + </tr> + <tr> + <td>{{SpecName('ES1')}}</td> + <td>{{Spec2('ES1')}}</td> + <td>初始定義。在 JavaScript 1.3 實作。</td> + </tr> + <tr> + <td>{{SpecName('ES5.1', '#sec-15.1.1.2', 'Infinity')}}</td> + <td>{{Spec2('ES5.1')}}</td> + <td> </td> + </tr> + <tr> + <td>{{SpecName('ES6', '#sec-value-properties-of-the-global-object-infinity', 'Infinity')}}</td> + <td>{{Spec2('ES6')}}</td> + <td> </td> + </tr> + <tr> + <td>{{SpecName('ESDraft', '#sec-value-properties-of-the-global-object-infinity', 'Infinity')}}</td> + <td>{{Spec2('ESDraft')}}</td> + <td> </td> + </tr> + </tbody> +</table> + +<h2 id="瀏覽器相容性">瀏覽器相容性</h2> + +<p>{{Compat("javascript.builtins.Infinity")}}</p> + + +<h2 id="參見">參見</h2> + +<ul> + <li>{{jsxref("Number.NEGATIVE_INFINITY")}}</li> + <li>{{jsxref("Number.POSITIVE_INFINITY")}}</li> + <li>{{jsxref("Number.isFinite")}}</li> +</ul> |
