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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Errors/Negative_repetition_count below:

RangeError: repeat count must be non-negative - JavaScript

RangeError: repeat count must be non-negative (Firefox)
RangeError: Invalid count value (Chrome)

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, +∞)。

"abc".repeat(-1); // RangeError

"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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