uniapp 正则限制小数点后只能两位

<input v-model="money" type="digit" @input="checkNum" placeholder="0" />

checkNum(e) {
    e.detail.value = e.target.value.match(/^\d*(\.?\d{0,2})/g)[0];
    this.$nextTick(function() {
	try {
	    this.money = Number(e.detail.value);
	} catch (e) {
	    uni.showToast({
		title: '金额输入不正确！',
		icon: 'none'
	    });
	  }
    });
},