Preview:
    isNumber(evt) {
      evt = evt ? evt : window.event;
      let charCode = evt.which ? evt.which : evt.keyCode;
      if (
        charCode > 31 &&
        (charCode < 48 || charCode > 57) &&
        charCode !== 46
      ) {
        evt.preventDefault();
      } else {
        return true;
      }
    },
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