### 基本用法

大部分属性与原生`<input>`控件一致。

``` html
<u-input maxlength="12" placeholder="请输入" autofocus></u-input>
```

### 加密

将`type`属性设置为`password`用于加密显示。

``` html
<u-input type="password" password maxlength="12" placeholder="请输入密码"></u-input>
```

### 双向绑定

使用`v-model`或`:value.sync`进行双向绑定。

提示：如果需要绑定的值自动转换为 number 类型，可以使用`number`修饰符。

``` vue
<template>
<u-linear-layout>
    <u-input v-model="value" maxlength="12" placeholder="请输入端口号"></u-input>
    <u-input :value.sync="value" maxlength="12" placeholder="请输入端口号"></u-input>
    <u-input v-model.number="numberValue" maxlength="12" placeholder="请输入端口号"></u-input>
</u-linear-layout>
</template>

<script>
export default {
    data() {
        return {
            value: '3306',
            numberValue: 3306,
        };
    },
};
</script>
```

### 只读和禁用

``` html
<u-linear-layout>
    <u-input value="只读" readonly></u-input>
    <u-input value="禁用" disabled></u-input>
</u-linear-layout>
```

### 可清空

开启`clearable`属性，在输入框有内容时会显示清空按钮。

``` html
<u-input value="可清空" clearable></u-input>
```

### 展示方式

默认为行内展示，可以将`display`设置为块级展示。

``` html
<u-linear-layout direction="vertical" gap="small">
    <u-input maxlength="12" placeholder="行内展示（默认）"></u-input> 与文字对齐
    <u-input display="block" maxlength="12" placeholder="块级展示"></u-input>
</u-linear-layout>
```

### 自定义样式

``` vue
<template>
<u-linear-layout>
    <u-input :class="$style.custom" maxlength="12" placeholder="class"></u-input>
    <u-input style="background: #f7f8fc; width: 200px;" maxlength="12" placeholder="style"></u-input>
</u-linear-layout>
</template>

<style module>
.custom {
    background: #f7f8fc;
    width: 60px;
}
</style>
```

### 自动扩展大小

``` vue
<template>
<u-linear-layout>
    <u-input v-model="value" auto-size="horizontal"></u-input>
</u-linear-layout>
</template>

<script>
export default {
    data() {
        return {
            value: 'abc',
        };
    },
};
</script>

<style module>
.custom {
    background: #f7f8fc;
    width: 60px;
}
</style>
```

### @deprecated 搜索图标

```html
<u-linear-layout>
    <u-input search="left" clearable size="normal medium" placeholder="1~12位小写字母" autofocus></u-input>
    <u-input search="right" clearable size="normal medium" placeholder="1~12位小写字母" autofocus></u-input>
</u-linear-layout>
```

### 和倒计时一起使用

``` vue
<template>
<u-form ref="form1">
    <!-- 这里之前用中文输入法会导致无法输入，已修复 -->
    <u-form-item label="中文名" name="username" rules="required">
        <u-input v-model="username"></u-input>
    </u-form-item>
    <u-form-item label="倒计时">
        {{ countdown }} 秒后重新获取
    </u-form-item>
</u-form>
</template>

<script>
export default {
    data() {
        return {
            username: '',
            countdown: 600
        };
    },
    mounted() {
        setInterval(() => {
            if (this.countdown === 0) {
                this.countdown = 600;
                return;
            }
            this.countdown--;
        }, 1000);
    },
};
</script>
```

### 键盘事件

``` vue
<template>
    <u-input v-model="value" @keydown="handleKeydown" @keyup="handleKeyup"></u-input>
</template>
<script>
export default {
    data() {
        return {
            value: '',
        };
    },
    methods: {
        handleKeydown(e, sender) {
            console.log('keydown', e, sender);
        },
        handleKeyup(e, sender) {
            console.log('keyup', e, sender);
        },
    },
};
</script>
```