JavaScript实现输入框内银行卡号与金额实时格式化

<div class="wrap">
  <input type="text" id="bankCard" placeholder="输入银行卡号">
</div>
 
<div class="wrap">
  <input type="text" id="moneyNum" placeholder="输入金额">
</div>

//卡号每4位一组格式化
    $("#bankCard").on("keyup", formatBC);
 
    function formatBC(e){
 
      $(this).attr("data-oral", $(this).val().replace(/\ +/g,""));
      //$("#bankCard").attr("data-oral")获取未格式化的卡号
 
      var self = $.trim(e.target.value);
      var temp = this.value.replace(/\D/g, '').replace(/(....)(?=.)/g, '$1 ');
      if(self.length > 22){
        this.value = self.substr(0, 22);
        return this.value;
      }
      if(temp != this.value){
        this.value = temp;
      }
    }
 

/*
    * 金额每3位数一组逗号隔开格式化
    * 1.先把非数字的都替换掉
    * 2.由于IE浏览器对于change事件存在兼容问题，改用focus和blur事件代替。
    * */
    $("#moneyNum").on("keyup", formatMN);
 
    $("#moneyNum").on({
      focus: function(){
        $(this).attr("data-fmt",$(this).val()); //将当前值存入自定义属性
      },
      blur: function(){
        var oldVal=$(this).attr("data-fmt"); //获取原值
        var newVal=$(this).val(); //获取当前值
        if (oldVal!=newVal) {
          if(newVal == "" || isNaN(newVal)){
            this.value = "";
            return this.value;
          }
          var s = this.value;
          var temp;
 
          if(/.+(\..*\.|\-).*/.test(s)){
            return;
          }
          s = parseFloat((s + "").replace(/[^\d\.\-]/g, "")).toFixed(2) + "";
          var l = s.split(".")[0].split("").reverse(),
              r = s.split(".")[1];
          t = "";
          for(i = 0; i < l.length; i ++ ) {
            t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length && (l[i+1]!='-')? "," : "");
          }
          temp = t.split("").reverse().join("") + "." + r;
          this.value = temp;
          return this.value;
        }
      }
    });
 
    function formatMN(e){
      this.value = this.value.replace(/[^\d\.\-]/g,"");
      $(this).attr("data-oral", parseFloat(e.target.value.replace(/[^\d\.-]/g, "")));
      //$("#moneyNum").attr("data-oral")获取未格式化的金额
    }

<div class="inputCard-wrap">
  <input type="text" class="inputCard">
  <div class="panelCard"></div>
</div>
 
<style type="text/css">
  .inputCard-wrap{
    position: relative;
  }
  .inputCard-wrap .panelCard{
    display: none;
    position: absolute;
    top:-34px;
    left:0;
    z-index: 100;
    background-color:#fff9da;
    border:1px #ffce6e solid;
    padding:10px;
    height:40px;
    font-size: 1.7em;
    line-height:18px;
    color:#585858;
  }
</style>

/* 银行卡号实时验证放大显示 */
$(".inputCard").keyup(function(e){
  var self = $.trim(e.target.value),
    parent = $(e.target).closest(".inputCard-wrap"),
    panel = $(".panelCard", parent),
    val = self.replace(/\D/g, '');
  if(self.length > 18){
    this.value = self.substr(0, 18);
    return this.value;
  }
  if(val == self){
    panel.show();
    val = self.replace(/(....)(?=.)/g, '$1 ');
    panel.html(val);
  }else{
    panel.hide();
    return self;
  }
});
$(".inputCard").unbind('focusin');
$(".inputCard").bind('focusin',function(e){
  var self = $.trim(e.target.value),
    parent = $(e.target).closest(".inputCard-wrap"),
    panel = $(".panelCard", parent),
    val = self.replace(/(....)(?=.)/g, '$1 ');
  if(val != '') {
    panel.show();
    panel.html(val);
  }
});
$(".inputCard").unbind('focusout');
$(".inputCard").bind('focusout',function(e){
  var parent = $(e.target).closest(".inputCard-wrap"),
    panel = $(".panelCard", parent);
  panel.hide();
});