wx/pages/index/index.wxml

<!--index.wxml-->
<!-- 登录页 -->
<view>
 <view class="v1" wx:if="{{flag}}">
 <view class="v2">
 <!-- <image class="img1" src=""></image> -->
 <input type="text" placeholder="请输入用户名/手机"/>
 <input type="password" placeholder="请输入密码"/>
 <view class="v3">
 <text>注册</text>
 <text class="text2">找回密码</text>
 </view>
 <button class="button">登录</button>
 <button class="button" bindtap="toggleLogin">二维码登录</button>
 </view>
 </view>
 <view class="v4" wx:else>
  <!-- <image class="qr" src="{{qrCode}}"></image> -->
 <button class="button" bindtap="toggleLogin">账号密码登录</button>
 </view>
</view>