此处input的type为digit

<input v-model="amount" type="digit" placeholder="请填写金额" @input="checkAmount"/>

data() {
	return {
		amount:""
	}
}

methods: {
	// 小数点后2位
	checkAmount(e){
		e = (e.match(/^\d*(\.?\d{0,2})/g)[0]) || null
		this.$nextTick(() => {
			this.amount = e
		})
	},
}