javaWeb中Option和select对象用法

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<script type="text/javascript">
var cities=[['选择城市'],['盐城','苏州'],['闵行','浦东']];
function selectcities(){
var faNode=document.getElementById("fa");
var subNode=document.getElementById("sub");
subNode.length=0;
var index=faNode.selectedIndex;
var arrcities=cities[index];
for(var i=0;i<arrcities.length;i++){
var option=document.createElement("option");
option.text=arrcities[i]; 
subNode.add(option,null); 
/* option.innerHTML=arrcities[i];
subNode.appendChild(option); */
}
}
</script>
</head>
<body>
<select id="fa" onChange="selectcities()">
<option>选择省份</option>
<option>江苏</option>
<option>上海</option>
</select>
<select id="sub">
<option>选择城市</option>
</select>
</body>
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