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標籤：方法 深圳 資料 ima img 聯動 lang country .text
try 可以設定提醒，用catch來捕獲傳回值
②省市聯動
迴圈填充的時候要先清空之前的，
代碼如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script type="text/javascript">
var arr = ["中國","美國","日本"];
arr["中國"] = ["北京","上海","廣州","深圳"];
arr["美國"] = ["紐約","華盛頓","洛杉磯","芝加哥"];
arr["日本"] = ["東京","大阪","北海道"];
arr["北京"] = ["北京1","北京2","北京3","北京4"];
arr["上海"] = ["上海1","上海2","上海3","上海4"];
arr["廣州"] = ["廣州1","廣州2","廣州3","廣州4"];
arr["深圳"] = ["深圳1","深圳2","深圳3","深圳4"];
arr["紐約"] = ["紐約1","紐約2","紐約3","紐約4"];
arr["華盛頓"] = ["華盛頓1","華盛頓2","華盛頓3","華盛頓4"];
arr["洛杉磯"] = ["洛杉磯1","洛杉磯2","洛杉磯3","洛杉磯4"];
arr["芝加哥"] = ["芝加哥1","芝加哥2","芝加哥3","芝加哥4"];
arr["東京"] = ["東京1","東京2","東京3","東京4"];
arr["大阪"] = ["大阪1","大阪2","大阪3","大阪4"];
arr["北海道"] = ["北海道1","北海道2","北海道3","北海道4"];
function addData(arrData,itemID){
document.getElementById(itemID).length = 0;//先清空傳過來id的所有內容，再添加
for(var i = 0; i<arrData.length; i++){
var option = new Option();//O大寫，
option.text = arrData[i];//返回前台介面值
option.value = arrData[i];//返回資料庫值
document.getElementById(itemID).options.add(option);//options固定賦值方法
}
}
function fun(){
addData(arr,"country");
addData(arr[arr[0]],"province");
addData(arr[arr[arr[0]][0]],"area");
}
function changePro(country){
addData(arr[country],"province");
addData(arr[arr[country][0]],"area");//觸發地區，也顯示城市對應的地區
}
function changeArea(province){
addData(arr[province],"area");
}
</script>
</head>
<body onload="fun()">
國家：<select id="country" onchange="changePro(this.value)"></select>
城市：<select id="province" onchange="changeArea(this.value)" ></select>
地區：<select id="area"></select>
</body>
</html>
JavaScript學習第二堂課--①輸入判斷②省市聯動
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