利用下拉框的方法实现两个txt列表内内容的左右切换
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<select id="left" size="10" multiple="multiple" style="width: 150px;">
<option >123</option>
<option >234</option>
<option >345</option>
<option >456</option>
<option >567</option>
</select>
<input type="button" id="btn1" value="向右" />
<input type="button" id="btn2" value="向左" />
<select id="right" size="10" multiple="multiple" style="width: 150px;">
<option >789</option>
<option >890</option>
<option >901</option>
<option >902</option>
<option >903</option>
</select>
</body>
</html>
<script>
var left = document.getElementById('left');
var right = document.getElementById('right');
document.getElementById('btn1').onclick = function(){
for(var i =0;i<left.selectedOptions.length;){
right.appendChild(left.selectedOptions[i]);
}
}
document.getElementById('btn2').onclick = function(){
for(var i =0;i<right.selectedOptions.length;){
left.appendChild(right.selectedOptions[i]);
}
}
</script>
