输入框工具----格式化手机号3-4-4

效果：

代码

getFormatPhone(phone){
  const purePhone = phone.replace(/\D/g, '');
  const { length } = purePhone;
  if (length <= 3) {
    return purePhone;
  } else if (length <= 7) {
    return purePhone.replace(/(\d{3})(\d{0,4})/, '$1 $2');
  } else {
    return purePhone.replace(/(\d{3})(\d{4})/, '$1 $2 ');
  }
},

传给后端时再把空格去掉：

let tell = this.mobile.replaceAll(" ","")