先来看看options集合的这几个方法:
options.add(option)方法向集合里添加一项option对象;
options.remove(index)方法移除options集合中的指定项;
options(index)或options.item(index)可以通过索引获取options集合的指定项;
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注意到上面创建option项时,使用了Option()构造函数,这个构造函数有两个版本的重载。
1、var option = new Option(text,value); //这里要大写Option()
2、var option = new Option();
option.text = text;
option.value=value;
我个人比较喜欢第一种方法来创建option对象。
另外,select标记还有一个比较有用的属性就是selectedIndex,通过它可能获取当前选择的option索引,或通过索引设置指定options集合中哪一项被选择。
select.selctedIndex = select.options.length-1; //将options集合中最后一项选中
var selectedItem = select.options(select.selectedIndex);//获取当前选中项
selectedItem.text; //选中项的文本
selectedItem.value; //选中项的值
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代码下载