javascript 手機號間隔顯示 123 4567 8910

// 手機號分隔顯示
        let tel = this.data.tel_value // 原始手機號

        let len = tel_value.length  // 原始手機號的長度

        let mobile = ''

        for (var i = 0; i < len; i++) {
            if (i == 2 || i == 6) {
                mobile = mobile + tel.charAt(i) + " ";
            }
            else {
                mobile = mobile + tel.charAt(i);
            }
        }

• 正則

  <script>
  var str = '13212345678';
  var newstr = '';
  newstr = str.replace(/\s/g, '').replace(/(^\d{3})(?=\d)/g, "$1 ").replace(/(\d{4})(?=\d)/g, "$1 ");
  console.log(newstr);
  </script>

• 手機號格式校驗

  let reg = /^[1][1,3,4,5,6,7,8,9][0-9]{9}$/ //正則驗證手機號