//手機號格式校驗
if (/^1[3456789]\d{9}$/.test(phonenum)) { //判斷手機號
console.log(手機號正確);
}
//手機號中間四位用“ **** ”代替
var
tel =
"13122223333"
;
var
reg = /^(\d{3})\d{4}(\d{4})$/;
tel = tel.replace(reg,
"$1****$2"
);
console.log(tel);
//空格分隔手機號碼
let phone = '88888888888'
let res = phone.replace(/^(.{3})(.*)(.{4})$/, '$1 $2 $3')
console.log(res) // 888 8888 8888