W3School TIY Editor
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<!DOCTYPE html> <html> <body> <input type="search" id="mySearch" placeholder="请输入要搜索的关键字..."> <p>单击下面的按钮可赋予焦点和/或从搜索字段中删除焦点。</p> <button type="button" onclick="getFocus()">获得焦点</button> <button type="button" onclick="loseFocus()">失去焦点</button> <script> function getFocus() { document.getElementById("mySearch").focus(); } function loseFocus() { document.getElementById("mySearch").blur(); } </script> </body> </html>