SOURCE

const days = '2021-10-25'
function ableDay(days) {
    let ableDate = ''
    let sino = ['年','月','日']
    for(let i = 0; i < 3; i++) {
       ableDate += days.split('-')[i]+sino[i]
    }
    return ableDate
}
console.log(ableDay(days))
console.log(days.replace(/-/g, '/'))
 
console 命令行工具 X clear

                    
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console