// 浮点数精度问题
   //减法 其他方法以此类推

    floatRemove(val, ele) {
      let b = val.toString().split(".")[1];
      let d = ele.toString().split(".")[1];
      let num = 0;
      //以防不是小数报错
      b ? (b = Math.pow(10, b.length)) : (b = 0);
      d ? (d = Math.pow(10, d.length)) : (d = 0);
      b > d ? (num = b) : (num = d);
      if (num == 0) {
        num = 1;
      }
      return (val * num - ele * num) / num;
    },