input 验证金额 保留两位小数

html

<view class="rig">
							<input placeholder="请输入单价" type="digit" v-model="info.unitPriceStr"
								@input="numberFixedDigit" placeholder-class="plaClass" maxlength="6" />
						</view>

js

//单价金额的限制
			numberFixedDigit(e) { // 固定两位小数
				let sNum = e.target.value.toString(); //先转换成字符串类
				if (sNum.indexOf('.') == 0) { //第一位就是 .
					console.log('first str is .')
					sNum = '0' + sNum
				}
				sNum = sNum.replace(/[^\d.]/g, "");
				sNum = sNum.replace(/\.{2,}/g, ".");
				sNum = sNum.replace(".", "$#$").replace(/\./g, "").replace("$#$", ".");
				sNum = sNum.replace(/^(\-)*(\d+)\.(\d\d).*$/, '$1$2.$3');
				if (sNum.indexOf(".") < 0 && sNum != "") {
					sNum = parseFloat(sNum);
				}
				console.log('输入的值1', sNum)
				this.$nextTick(() => {
					this.info.unitPriceStr = sNum
				})

				console.log('单价 this.info.unitPriceStr', this.info.unitPriceStr)
			},