el-input 控制输入内容只能输金额

<el-input class="input" v-model="params.fillCommission" clearable @input="judgeVal($event)"></el-input>

judgeVal(value) {
      console.log(value,'judgeVal'); 
        let val = (value && value.split("")) || [];
        let sNum = val.toString(); //先转换成字符串类型
        if (sNum.indexOf('.') === 0) {//第一位就是 . 
          sNum = '0' + sNum
        }
        sNum = sNum.replace(/[^\d.]/g,"");  //清除“数字”和“.”以外的字符
        sNum = sNum.replace(/\.{2,}/g,"."); //只保留第一个. 清除多余的
        sNum = sNum.replace(".","$#$").replace(/\./g,"").replace("$#$",".");
        sNum = sNum.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3');//只能输入两个小数
        //以上已经过滤，此处控制的是如果没有小数点，首位不能为类似于 01、02的金额
        if(sNum.indexOf(".")< 0 && sNum !==""){
          sNum = parseFloat(sNum);
        }
        this.params.fillCommission = sNum; 
    }
···