摘要:
<body> <select id=s1 multiple="multiple" size="7"> <option>123</option> <option>234</option> <option>456</option> <option>678</option> <option>890</op 阅读全文
摘要:
点击事件: <body> <input type="button" id="btn1"/> <input type="button" value="按 钮" onclick="btn_click()" /> </body> <script> var btn1=document.getElementB 阅读全文