框中無內容，代碼如下：<!DOCTYPE html><html><head>? <meta charset="UTF-8">? <title>省市聯動</title></head><script type="text/javascript">? var arr = ["中國","美國","日本"] ;? ? ? arr["中國"] = ["北京","上海","釣魚島"] ; //不能再加var，否則不是二維數組了? ? ? arr["美國"] = ["紐約","華盛頓","舊金山"] ;? ? ? arr["日本"] = ["東京","大阪","神戶"] ;? ??? ? ? arr["北京"] = ["海淀","朝陽","昌平","豐臺"] ;? ? ? arr["上海"] = ["浦東","金山","崇明","浦西"] ;? ? ? arr["釣魚島"] = ["釣魚島東","釣魚島南","釣魚島西","釣魚島北"] ;? ? ? 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["舊金山"] = ["舊金山1","舊金山2","舊金山3","舊金山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["神戶"] = ["神戶1","神戶2","神戶3","神戶4"] ;? ? ? function init(){? ? ? ? //填充國家? ? ? ? fillData(arr,"country");? ? ? ? ??? ? ? ? ? //添加省市? ? ? ? ? fillData(arr[arr[0]],"province");? ? ? ? ??? ? ? ? ? //添加地區? ? ? ? ? fillData(arr[arr[0][0]],"country");? ? ? ? }? ? ? ? function fillData(arr,id)? ? ? ? ? //清空select選項? ? ? ? ? document.getElementById(id).options.length=0;? ? ? ? ? //添加選項? ? ? ? ? for(var i=0;i<arr.length;i++){? ? ? ? ? ? //創建option對象? ? ? ? ? ? var option=new option();? ? ? ? ? ? option.text=arr[i];? ? ? ? ? ? option.value=arr[i];? ? ? ? ? ? document.getElementById("id").options.add(option);?? ? ? ? ? }? ? ? ? function changepro(coun){? ? ? ? ? //清空省市選項? ? ? ? ? document.getElementById("province").options.length=0;? ? ? ? ? //添加省市? ? ? ? ? fillData(arr[coun],"province");? ? ? ? ? //添加地區? ? ? ? ? fillData(arr[arr[coun][0]],"area");? ? ? ? }? ? ? ? function changearea(pro){? ? ? ? ? fillData(arr[pro],"area");? ? ? ? }?? ? ? } ?</script>?<body onload="init()">? 國家:<select ?id="country" onchange="changepro(this.value)"></select>? 省市：<select ?id="province" onchange="changearea(this.value)"></select>? 地區：<select ?id="area"></select></body></html>
省市聯動，為什么都顯示不出來？
qq_淺秋_04051456
2016-11-30 23:00:59