小程序的input在失去焦点时，字体和手机字体不一致

你好，贴一下你的代码，看一下你是咋用的

<view class="flex align-center padding-tb-lg solid-bottom">  
            <view class="flex-sub">  
                <text>昵称</text>  
            </view>  
            <view class="margin-right-xs text-right">  
                <input @blur="nicknameChange" :value="user.nickname?user.nickname:''" class="text-grey text-df" placeholder-class="text-grey text-df" placeholder="取一个好听的名字吧"/>  
            </view>  
            <view>  
                <text class="cuIcon-right text-grey"></text>  
            </view>  
        </view>  
        <view class="flex align-center padding-tb-lg solid-bottom">  
            <view class="flex-sub">  
                <text>性别</text>  
            </view>  
            <view class="margin-right-xs text-right">  
                <picker @change="genderChange" :range="genderOptions" range-key="label">  
                    <text class="text-grey text-df">{{genderName}}</text>  
                </picker>  
            </view>  
            <view>  
                <text class="cuIcon-right text-grey"></text>  
            </view>  
        </view>