javascript面試題
1：select選擇改變時，顯示改變的內容
<html>
<head>
<script>
function sel(obj){
alert(obj.options[obj.selectedIndex].text);
alert(obj.options[obj.selectedIndex].value);
}
</script>
</head>
<body>
<form>
<select size="1" οnchange="sel(this)">
<option value="a">1</option>
<option value="b">2</option>
<option value="c">3</option>
</select>
</form>
</body>
</html>
var a = 10; var b = 20; var c = 10; alert(a = b)//20; alert(a == b)//false; alert(a == c)//true;結果是？