vue中input框怎么做校验 怎么让他只能输入文字并且对输入的文字做判断 还有对输入的字符串长度做判断
```javascript
<el-table-column
prop="entrustedAmount"
label="金额"
align="center"
>
<template slot-scope="scope">
<input
placeholder="请输入"
type="number"
v-model="scope.row.entrustedAmount"
/>
</template>
</el-table-column>