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RangeError: repeat count must be less than infinity

信息

RangeError: repeat count must be less than infinity and not overflow maximum string size (Firefox) RangeError: Invalid count value (Chrome)

本文内容

错误类型

RangeError

发生了什么？

代码中使用了 String.prototype.repeat()方法。它有一个计数参数，表示重复该字符串的次数。该参数必须在 0 及正 Infinity 之间，且不能为负数。该值的合法范围可以这样表示： [0, +∞)。

其结果字符串也不能长于最大字符串，不同 JavaScript 引擎中可能有所不同。在 Firefox (SpiderMonkey) 里最大字符串大小为 2^28 -1 (0xFFFFFFF)。

示例

无效的

js
"abc".repeat(Infinity); // RangeError "a".repeat(2 ** 28); // RangeError

有效的

js
"abc".repeat(0); // '' "abc".repeat(1); // 'abc' "abc".repeat(2); // 'abcabc' "abc".repeat(3.5); // 'abcabcabc' (count will be converted to integer)

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