用户手动调节输入框样式：
<!DOCTYPE html> <html> <head> <style> div { border: 2px solid; padding: 20px; width: 300px; resize: vertical; overflow: auto; } </style> </head> <body> <h1>The resize Property</h1> <div> <p>Let the user resize only the height of this div element.</p> <p>To resize: Click and drag the bottom right corner of this div element.</p> </div> <p><b>Note:</b> Internet Explorer does not support the resize property.</p> </body> </html>