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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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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>