使用Vue自定义数字键盘组件(体验度极好)

<div class='key-container'>
  <div class='key-title'>请输入金额</div>
  <div class='input-box'>{{ money }}</div>
  <div class='keyboard' @click.stop='_handleKeyPress'>
    <div class='key-row'>
      <div class='key-cell' data-num='7'>7</div>
      <div class='key-cell' data-num='8'>8</div>
      <div class='key-cell' data-num='9'>9</div>
      <div class='key-cell' data-num='D'>C</div>
    </div>
    <div class='key-row'>
      <div class='key-cell' data-num='4'>4</div>
      <div class='key-cell' data-num='5'>5</div>
      <div class='key-cell' data-num='6'>6</div>
      <div class='key-cell' data-num='C'>清空</div>
    </div>
    <div class='key-row'>
      <div class='key-cell' data-num='1'>1</div>
      <div class='key-cell' data-num='2'>2</div>
      <div class='key-cell' data-num='3'>3</div>
      <div class='key-cell' data-num='-1'></div>
    </div>
    <div class='key-row'>
      <div class='key-cell disabled' data-num='-1'></div>
      <div class='key-cell' data-num='.'>.</div>
      <div class='key-cell' data-num='0'>0</div>
      <div class='key-cell' data-num='-1'></div>
    </div>
    <div class='key-confirm' data-num='S'>确认</div>
  </div>
</div>

//处理按键
_handleKeyPress(e) {
 let num = e.target.dataset.num;
 //不同按键处理逻辑
 // -1 代表无效按键，直接返回
 if (num == -1) return false;
 switch (String(num)) {
 //小数点
 case '.':
  this._handleDecimalPoint();
  break;
 //删除键
 case 'D':
  this._handleDeleteKey();
  break;
 //清空键
 case 'C':
  this._handleClearKey();
  break;
 //确认键
 case 'S':
  this._handleConfirmKey();
  break;
 default:
  this._handleNumberKey(num);
  break;
 }
}

//处理小数点函数
 _handleDecimalPoint() {
  //如果包含小数点，直接返回
  if (this.money.indexOf('.') > -1) return false;
  //如果小数点是第一位，补0
  if (!this.money.length)
  this.money = '0.';
  //如果不是，添加一个小数点
  else
  this.money = this.money + '.';
 }

//处理删除键
 _handleDeleteKey() {
  let S = this.money;
  //如果没有输入，直接返回
  if (!S.length) return false;
  //否则删除最后一个
  this.money = S.substring(0, S.length - 1);
 }

//处理清空键
 _handleClearKey() {
  this.money = '';
 }

_handleConfirmKey() {
  let S = this.money;
  //未输入
  if (!S.length){
  alert( '您目前未输入!' )
  return false;
  }
  //将 8. 这种转换成 8.00
  if (S.indexOf('.') > -1 && S.indexOf('.') == (S.length - 1))
  S = Number(S.substring(0, S.length - 1)).toFixed(2);
  //保留两位
  S = Number(S).toFixed(2);
  this.$emit('confirmEvent',S)
 }

//处理数字
 _handleNumberKey(num) {
  let S = this.money;
  //如果有小数点且小数点位数不小于2
  if ( S.indexOf('.') > -1 && S.substring(S.indexOf('.') + 1).length < 2)
  this.money = S + num;
  //没有小数点
  if (!(S.indexOf('.') > -1)) {
  //如果第一位是0，只能输入小数点
  if (num == 0 && S.length == 0)
   this.money = '0.';
  else {
   if (S.length && Number(S.charAt(0)) === 0) return;
   this.money = S + num;
  }
  }
 }

<calculation @confirmEvent="_confirmEvent"></calculation>

_confirmEvent(res){
 console.log(res)
}