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+---
+title: 'RangeError: repeat count must be non-negative'
+slug: Web/JavaScript/Reference/Errors/Negative_repetition_count
+tags:
+  - Errors
+  - JavaScript
+  - RangeError
+  - 错误
+translation_of: Web/JavaScript/Reference/Errors/Negative_repetition_count
+---
+<div>{{jsSidebar("Errors")}}</div>
+
+<h2 id="信息">信息</h2>
+
+<pre class="syntaxbox">RangeError: repeat count must be non-negative (Firefox)
+RangeError: Invalid count value (Chrome)
+</pre>
+
+<h2 id="错误类型">错误类型</h2>
+
+<p>{{jsxref("RangeError")}}</p>
+
+<h2 id="发生了什么">发生了什么?</h2>
+
+<p>代码中使用了 {{jsxref("String.prototype.repeat()")}}方法。<span class="short_text" id="result_box" lang="zh-CN"><span>它有一个计数参数，表示重复该字符串的次数</span></span>。该参数必须在 0 及正 {{jsxref("Infinity")}} 之间，且不能为负数。该值的合法范围可以这样表示： [0, +∞)。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="无效的">无效的</h3>
+
+<pre class="brush: js example-bad">'abc'.repeat(-1); // RangeError </pre>
+
+<h3 id="有效的">有效的</h3>
+
+<pre class="brush: js example-good">'abc'.repeat(0);    // ''
+'abc'.repeat(1);    // 'abc'
+'abc'.repeat(2);    // 'abcabc'
+'abc'.repeat(3.5);  // 'abcabcabc' (count will be converted to integer)
+</pre>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("String.prototype.repeat()")}}</li>
+</ul>