tryjsref_select_options 在线代码实例

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>  
<script>
var carsAndModels={};
carsAndModels[\'VO\']=[\'V70\',\'XC60\',\'XC90\'];
carsAndModels[\'VW\']=[\'Golf\',\'Polo\',\'Scirocco\',\'Touareg\'];
carsAndModels[\'BMW\']=[\'M6\',\'X5\',\'Z3\'];
function ChangeCarList(){
    var carList=document.getElementById("car");
    var modelList=document.getElementById("carmodel");
    var selCar=carList.options[carList.selectedIndex].value;
    while (modelList.options.length){
        modelList.remove(0);
    }
    var cars=carsAndModels[selCar];
    if (cars){
        for (var i=0;i<cars.length;i++){
            var car=new Option(cars[i],i);
            modelList.options.add(car);
        }
    }
} 
</script>
</head>
<body onload="ChangeCarList();">   
<select id="car" onchange="ChangeCarList();"> 
    <option value="">-- Car --</option> 
    <option value="VO">Volvo</option> 
    <option value="VW">Volkswagen</option> 
    <option value="BMW">BMW</option> 
</select> 
<select id="carmodel"></select> 
 
 
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运行结果
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