一、展示效果：
IOS手机：
autocomplete="one-time-code"
<van-field :class="$style.code" v-model="verifyCode" type="text" name="验证码" pattern="\d{4}" maxlength=4 placeholder="验证码" autocomplete="one-time-code" :rules="[{required: true, message: '请填写验证码'}]" />
Android手机：
Verify phone numbers on the web with the WebOTP API
autocomplete相关内容：
<input id="new-password-text-field" type="password" autocomplete="new-password"/> <input id="user-text-field" type="email" autocomplete="username"/> <input id="password-text-field" type="password" autocomplete="current-password"/> <input id="single-factor-code-text-field" autocomplete="one-time-code"/>
参考链接：
