From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: 'RangeError: argument is not a valid code point'
+slug: Web/JavaScript/Reference/Errors/Not_a_codepoint
+translation_of: Web/JavaScript/Reference/Errors/Not_a_codepoint
+---
+<div>{{jsSidebar("Errors")}}</div>
+
+<h2 id="错误信息">错误信息</h2>
+
+<pre class="syntaxbox">RangeError: {0} is not a valid code point (Firefox)
+RangeError: Invalid code point {0} (Chrome)
+</pre>
+
+<h2 id="错误类型">错误类型</h2>
+
+<p>{{jsxref("RangeError")}}</p>
+
+<h2 id="什么地方出错了？">什么地方出错了？</h2>
+
+<p> {{jsxref("String.fromCodePoint()")}} 这个方法只能接受有效的码位（code point） 。</p>
+
+<p>码位（ <a href="https://en.wikipedia.org/wiki/Code_point">code point</a>）是组成码空间（或代码页）的数值，范围是 0 到 0x10FFFF。</p>
+
+<p> {{jsxref("NaN")}}，负整数（-1），非整数（3.14），或编号大于0x10FFFF (1114111) 的字符，无法使用该方法。</p>
+
+<h2 id="范例">范例</h2>
+
+<h3 id="无效的例子">无效的例子</h3>
+
+<pre class="brush: js example-bad">String.fromCodePoint('_');      // RangeError
+String.fromCodePoint(Infinity); // RangeError
+String.fromCodePoint(-1);       // RangeError
+String.fromCodePoint(3.14);     // RangeError
+String.fromCodePoint(3e-2);     // RangeError
+String.fromCodePoint(NaN);      // RangeError</pre>
+
+<h3 id="有效的例子">有效的例子</h3>
+
+<pre class="brush: js example-good">String.fromCodePoint(42);       // "*"
+String.fromCodePoint(65, 90);   // "AZ"
+String.fromCodePoint(0x404);    // "\u0404"
+String.fromCodePoint(0x2F804);  // "\uD87E\uDC04"
+String.fromCodePoint(194564);   // "\uD87E\uDC04"
+String.fromCodePoint(0x1D306, 0x61, 0x1D307) // "\uD834\uDF06a\uD834\uDF07"
+</pre>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("String.fromCodePoint()")}}</li>
+</ul>
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