<input tyPE="text" v-model="bankCard" @keyup="bankCardKeyup"> bankCardKeyup (e) {   let self = this   // 如果是删除键，则不加空格，且删去字符串末端空格   if (e.keyCode === 8) {   self.bankCard = self.bankCard.replace(/[/s/n/t]+$/g, "")   return   }   self.bankCard = self.bankCard.replace(/[^0-9|' ']*/g, '')   let value = self.bankCard.replace(/[^0-9]*/g, '')   if (value.length > 4 && value.length <= 8) {   self.bankCard = value.slice(0, 4) + ' ' + value.slice(4, value.length)   }   else if (value.length > 8 && value.length <= 12) {   self.bankCard = value.slice(0, 4) + ' ' + value.slice(4, 8) + ' ' + value.slice(8, value.length)   }   else if (value.length > 12 && value.length <= 16) {   self.bankCard = value.slice(0, 4) + ' ' + value.slice(4, 8) + ' ' + value.slice(8, 12) + ' ' + value.slice(12, value.length)   if (value.length === 16) {    // 调用识别银行卡函数    }   }   else if (value.length > 16) {   self.bankCard = value.slice(0, 4) + ' ' + value.slice(4, 8) + ' ' + value.slice(8, 12)+ ' ' + value.slice(12, 16) + ' ' + value.slice(16, value.length)   if (value.length === 19) {    // 调用识别银行卡函数    }   else if (value.length > 19) {    self.bankCard = value.slice(0, 4) + ' ' + value.slice(4, 8) + ' ' + value.slice(8, 12)+ ' ' + value.slice(12, 16) + ' ' + value.slice(16, 19)   }   }  },

 <input type="text" v-model="bankCard" @keyup="bankCardKeyup"> bankCardKeyup () {  let self = this  self.bankCard = self.bankCard.replace(//s/g,'').replace(/[^/d]/g,'').replace(/(/d{4})(&#63;=/d)/g,'$1 ') }