<style> select{ width: 100px; } </style> </head> <body> <form action="" class="form"> <select name="" id="s1" size="10"> <option value="苹果">苹果</option> <option value="香蕉">香蕉</option> <option value="金桔">金桔</option> <option value="西瓜">西瓜</option> <option value="菠萝">菠萝</option> <option value="柿子">柿子</option> <option value=“哈密瓜">哈密瓜</option> <option value="葡萄">葡萄</option> </select> <button id="bid">»</button> <select name="" id="s2" size="10"> </select> </form> <script> var bid=document.getElementById("bid"); bid.onclick=function () { var s1=document.getElementById("s1"); var s2=document.getElementById("s2"); var index=s1.selectedIndex; if(index >= 0){ s2.add(s1.options[index]); } } </script>
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