HTML:

<div v-for="(item, index) in list" :key="index">

   <input v-model="item.enable_amount" type="number" @input=" numberFixedDigit($event, item, 'enable_amount')"/>

</div>

data:

list: [         { enable_amount: null},         { enable_amount: null},      ],

js:

   numberFixedDigit(e, obj, name) {             e.target.value = e.target.value.match(/^\d*(\.?\d{0,2})/g)[0] || "";             this.$nextTick(() => {                 obj[name] = Number(e.target.value) || null;             });         },