js实现字符串中间替换成特殊字符***

let str = 'https://www.02405.com'
let middle='***'
function filter(str,middle) {
    return str[0]+middle+str[str.length-1]
}
console.log(filter(str,middle));//h***m

let str = 'https://www.02405.com'
let m = '***'
function forMate (str, start = 1, end = 1, middle = '***') { 
   const startStr =  str.slice(0,start)
   const endStr =  str.slice(str.length-end,str.length)
   return startStr + middle + endStr
}
console.log(forMate(str,2,3,m)); //ht***com