修复ios登录自动填充验证码多遍问题

src/pages/login.vue

@@ -30,7 +30,7 @@
       </view>
 
       <view id="login-input" v-if="switchText == '账号密码登录'">
-        <u-input v-model="verify" prefixIcon="email" placeholder="请输入验证码">
+        <u-input v-model="verify" prefixIcon="email" placeholder="请输入验证码" :maxlength="6">
           <template #suffix>
             <u-button @click="getVerifyCode">{{ !codeTime ? "获取验证码" : codeTime + "s" }}</u-button>
           </template>