W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
运行代码
<html> <head> <script type="text/javascript"> function setFocus() { document.getElementById('text1').focus() } function loseFocus() { document.getElementById('text1').blur() } </script> </head> <body> <form> <input type="text" id="text1" /> <br /> <input type="button" onclick="setFocus()" value="设置焦点" /> <input type="button" onclick="loseFocus()" value="失去焦点" /> </form> </body> </html>