vue输入框只允许输入规定类型的格式，其他字符不允许输入

<template>
	<div>
		<input @input="formatValue(value)" v-model="value">
	</div>
</template>

<script>
	export default = {
		data(){
			return {
				value: ""
			}
		},
		methods：{
			// 只允许输入数字
			formatValue(val){
				val = this.value.replace(/[^\d]/g, "");
                this.value = val;
			},
			// 只允许输入金额类型，并且是两位小数
			formatValue(val){
				val = val.replace(/(^\s*)|(\s*$)/g, "");
                if (!val) return this.value = "";
                val = val.replace(/[^\d.]/g, "");
                val = val.replace(/^\./g, "");
                val = val
                    .replace(".", "$#$")
                    .replace(/\./g, "")
                    .replace("$#$", ".");
                val = val.replace(/^(\-)*(\d+)\.(\d\d).*$/, "$1$2.$3");
                this.value = val;
			},
		}
	}
</script>