ant-design-vue/components/input-number/demo/digit.md

#### 小数 和原生的数字输入框一样，value 的精度由 step 的小数位数决定。 #### Decimals A numeric-only input box whose values can be increased or decreased using a decimal step. The number of decimals (also known as precision) is determined by the step prop.

<template>
  <a-input-number :min="0" :max="10" :step="0.1" @change="onChange" />
</template>
<script>
  export default {
    methods: {
      onChange(value) {
        console.log('changed', value);
      },
    },
  }
</script>