实现金钱的每三位划分

Posted 2020-12-06 apple78

let arr = ‘1234567890‘
function trans(arr){
    let b=arr.split(‘‘).reverse()
    return b.reduce((pre, cur, idx)=>{
        return ((idx%3)?cur:cur+‘,‘) + pre
    })
}
console.log(trans(arr));// 1,234,567,890