[JavaScript知识库]页面中只能输入金额字

 <van-field
            @input="handle"
            @blur="blurAmounPrice"
            v-model="amounPrice"
            type="number"
            placeholder="请输入收款金额"
          />
          //methods
handle(value) {
      if (value.indexOf(".") >= 0) {
        let index = value.indexOf(".");
        let valueLen = value.length;
        if (value.length >= 2 && valueLen - (index + 1) > 2) {
          this.amounPrice = value.substring(0, index + 1 + 2);
        } else {
        }
      }
      this.blurAmounPrice()
    },
 blurAmounPrice() {
      let amounPrice = this.amounPrice;
      let financeListData = this.financeListData;
      let totalAmount = 0;
      financeListData.forEach((v) => {
        if (v.checked) {
          totalAmount = floatAdd(v.receivablesAmount, totalAmount);
        }
      });

      if (amounPrice) {
        if (Number(totalAmount) <= Number(amounPrice)) {
          this.amounPrice = totalAmount;
        }
      }
    },




 balancePrice() {
      let totalPrice = this.totalPrice.replace(/\,/g, "");
      totalPrice = Number(totalPrice);
      let amounPrice = this.amounPrice ? this.amounPrice + "" : "0";
      if (amounPrice.indexOf(".") == 0) {
        amounPrice = 0 + amounPrice;
        this.amounPrice = amounPrice;
      }
      this.amounPrice = `${this.amounPrice}`.replace(/-/g, "");
      amounPrice = Number(amounPrice);
      let balance = floatSub(totalPrice, amounPrice);
      balance = numberFormat(balance, "2", ".", ",", "round");
      return balance;
    },