ant-design-vue/components/input/demo/autosize-textarea.md

#### 适应文本高度的文本域 `autosize` 属性适用于 `textarea` 节点，并且只有高度会自动变化。另外 `autosize` 可以设定为一个对象，指定最小行数和最大行数。 #### Autosizing the height to fit the content `autosize` prop for a `textarea` type of `Input` makes the height to automatically adjust based on the content. An options object can be provided to `autosize` to specify the minimum and maximum number of lines the textarea will automatically adjust.

<template>
  <div>
    <a-textarea placeholder="Autosize height based on content lines" autosize />
    <div style="margin: 24px 0" />
    <a-textarea placeholder="Autosize height with minimum and maximum number of lines" :autosize="{ minRows: 2, maxRows: 6 }" />
  </div>
</template>