把类似这种字符串abcdddddddd,转成这种格式abcdddd-dd-dd。不过看意思感觉是打算格式化日期字符串(如:"20200924"转成"2020-09-24")。如果真是格式化日期字符串,正则应该是:/^(\d{4})(\d{2})(\d{2})$/:// "20200924"转成"2020-09-24" '20200924'.replace(/^(\d{4})(\d{2})(\d{2})$/, '$1-$2-$3')
把类似这种字符串
abcdddddddd
,转成这种格式abcdddd-dd-dd
。不过看意思感觉是打算格式化日期字符串(如:"20200924"转成"2020-09-24")。如果真是格式化日期字符串,正则应该是:
/^(\d{4})(\d{2})(\d{2})$/
: