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authort7yang <t7yang@gmail.com>2022-01-10 08:38:08 +0800
committerIrvin <irvinfly@gmail.com>2022-02-16 02:35:54 +0800
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@@ -37,7 +37,7 @@ translation_of: Web/JavaScript/Reference/Global_Objects/String/fromCharCode
<h3 id="返回补充字符">返回补充字符</h3>
-<p>在 UTF-16 中,绝大部分常用的字符可以用一个 16 位的值表示(即一个代码单元)。然而,有一类字符叫 Base Multilingual Plane (BMP),是所有可寻址的 Unicode 码点的 <sup>1</sup>/<sub>17</sub><sup>th</sup>。剩下的码点,从范围 <code>65536</code> (<code>0x010000</code>) 到 <code>1114111</code> (<code>0x10FFFF</code>) 被称之为补充字符。在 UTF-16 中,补充字符也叫代理(surrogates),用两个 16 位代码单元表示,它是有目的被保留下来的。两个代理(surrogates)形成一个有效组合,也叫代理对,可以用来表示一个补充字符。</p>
+<p>在 UTF-16 中,绝大部分常用的字符可以用一个 16 位的值表示(即一个代码单元)。然而,有一类字符叫 Base Multilingual Plane (BMP),是所有可寻址的 Unicode 码点的 1/17th。剩下的码点,从范围 <code>65536</code> (<code>0x010000</code>) 到 <code>1114111</code> (<code>0x10FFFF</code>) 被称之为补充字符。在 UTF-16 中,补充字符也叫代理(surrogates),用两个 16 位代码单元表示,它是有目的被保留下来的。两个代理(surrogates)形成一个有效组合,也叫代理对,可以用来表示一个补充字符。</p>
<p>因为 <code>fromCharCode()</code> 只作用于 16 位的值 (跟 <code>\u</code> 转义序列一样),为了返回一个补充字符,一个代理对是必须的。例如,<code>String.fromCharCode(0xD83C, 0xDF03)</code> 和 <code>\uD83C\uDF03</code> 返回码点 <code>U+1F303</code> "Night with Stars"。</p>