按钮怎么判断安卓和iOS

按钮怎么判断安卓和iOS？怎么判断通过Apple登录在iOS的时候显示，安卓手机不显示按钮？


<view id="logo2">
        <view class="inner">
            <view>
                <button class="wx-button" @tap="addCode"><image class="wx-img" src="https://socialize.oss-cn-shenzhen.aliyuncs.com/img/tab/CYDuploading/weixinICON.png"></image>微信一键登录</button>
            </view>
            <view>
                <button class="login-button" @click="login()">登录</button>
            </view>
            <view>0
                <button class="apple-button"><image class="apple-img" src="https://socialize.oss-cn-shenzhen.aliyuncs.com/img/tab/CYDuploading/pinguoICON.png"></image>通过Apple登录</button> 
            </view>
            <view>
                <button class="apple-button" @click="touristLogin()">游客登录</button> 
            </view>
        </view>
    </view>

wx.getSystemInfoSync()方法
参考 https://www.kesion.com/miniprogramdev/51890.html