BootWiki教程网
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>BootWiki 教程网</title> <script> function displayResult(){ document.getElementById("mySelect").multiple=true; } </script> </head> <body> <form> <select id="mySelect" size="4"> <option>Apple</option> <option>Pear</option> <option>Banana</option> <option>Orange</option> </select> </form> <button onclick="displayResult()" type="button">允许多个选择</button> <p>按下Ctrl键来选择多个选项</p> </body> </html>
运行结果