原生子窗体subNVues 使用input组件为什么不显示？

<template>  
    <view class="container">  
        <text class="titleView">项目： {{ projectName }}</text>  
        <view class="formItem">  
            <text class="title">姓名：</text>  
            <input class=" content" type="text" placeholder="请输入您的姓名" value="customerName" />  
        </view>  
        <view class="formItem">  
            <text class="title">电话：</text>  
            <input class=" content" type="number" placeholder="请输入电话" value="customerPhone" />  
        </view>  
        <view class="formItem">  
            <text class="title">日期：</text>  
            <picker mode="date" :value="visitTime" @change="bindDateChange" :start="toDay">  
                <text class="content">{{visitTime }}</text>  
            </picker>  
        </view>  
        <view class="formItem">  
            <text class="title">备注：</text>  
            <input class="content" type="text" placeholder="请输入备注" value="remark" />  
        </view>  
        <button class="btn" @click="submit" :class="loginMobile ? 'btn-active' : ''" :disabled="!loginMobile">提交</button>  
    </view>  
</template>  

<script>  
    export default {  
        data() {  
            return {  
                projectName:'盛唐城',  
                customerName:'',  
                customerPhone:'',  
                visitTime:'',  
                remark:'',  
                loginMobile:true  
            }  
        },  
        methods: {  

        }  
    }  
</script>  

<style>  
.container{  
    background-color: #ffffff;  
    border-radius: 10upx;  
    padding: 30upx;  
}  
.titleView{  
    color: #000000;  
    text-align: center;  
    font-size: 14px;  
    font-weight: bold;  
}  
.formItem {  
    padding: 1upx 30upx;  
    align-items: center;  
    flex-direction: row;  
    justify-content: space-between;  
    height: 98upx;  
    border-bottom-color: #eeeeee;  
    border-bottom-width: 1upx;  
    border-bottom-style: solid;  
}  

.title {  
    color: #666666;  
    text-align: center;  
    padding-right: 30upx;  
    font-size: 15px;  
    font-weight: normal;  
    height: 30upx;  
    line-height: 30upx;  
}  
.content{  
    color: #666666;  
    text-align: center;  
    font-size: 15px;  
    font-weight: normal;  
    height: 30upx;  
    line-height: 30upx;  
}  

.btn{  
    margin-top: 40upx;  
}  

.btn-active {  
    color: #ffffff;  
    background-color:  #f43f3b;  
}  
.btn-hover {  
    background-color:  #ffc0cb;  
}  

</style>

原生子窗体subNVues 使用input组件为什么不显示？显示结果如下：