https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Number/POSITIVE_INFINITY
Number.POSITIVE_INFINITY - JavaScript | MDN
Number.POSITIVE_INFINITY 静态数据属性表示正无穷大值。
infinity javascript mdnnumber
https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Errors/Resulting_string_too_large
RangeError: repeat count must be less than infinity - JavaScript | MDN
infinity javascript mdnrepeat