<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<!--<input type="button" id = 'seleteSpecific' value='delete'/>-->
<select><option>smoke bomb</option></select>
</body>
<script type="text/javascript">
//select 元素中的options有自己涂有的方法和属性
//1 新建一个select
var sel = document.createElement('select');
sel.id='testSelect';
document.body.appendChild(sel);
//2 添加option
var newOption = document.createElement('option');
newOption.value = 1;
//newOption.appendChild(document.createTextNode('text'));
newOption.innerHTML = 'zzz';
/*if(newOption.innerText){
alert('NOT FF');
}else if(newOption.textContent){
alert('FF');
}*/
sel.appendChild(newOption);
//sel.options.add(new Option('text','1'));
//3 删除所有选项
// alert('delete');
sel.options.length = 0;
//4 删除指定option，先创建几个
sel.options.add(new Option('text1','1'));
var selectedOption = new Option('text2','2');//创建一个被选中的选项
//selectedOption.setAttribute('selected','selected');//IE FF 兼容,FF支持new
Option('text2','2','selected') 或者 new
Option('text2','2',{'selected'：'selected'})
sel.options.add(selectedOption);
sel.options.add(new Option('text3','3'));
var anotherSelectedOption = new Option('text4','4');
anotherSelectedOption.setAttribute('selected','selected');
sel.options.add(anotherSelectedOption);
//var deletButton = document.getElementById('seleteSpecific');
var index = sel.selectedIndex;
alert(index);
//sel.options.remove(index);//options 有自己的remove方法，而一般的DOM只有removeChild方法
//sel.options[index] = null;
//5 获取选中项的text.option[index]有text属性
with(sel){//尝试使用with
//console.log(options);
alert(options[index].text);
}
//6 替换选中option
sel.options[index] = new Option('text5','5');
//删除select,通用其他DOM
sel.parentNode.removeChild(sel);
</script>
</html>