<div class="mui-input-row mui-search mui-input-speech search"> <input type="search" class="enter_search" placeholder="请输入序列号" id="serial_number"> <button class="icon_btn" id="scan_code_button"></button> </div>
<style> .mui-search .mui-placeholder { pointer-events: none; } </style>
原文：https://www.cnblogs.com/HiDeveloper/p/9044724.html