<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>范例 5-4</title>
</head>
<body>
<script language="javascript">
var who = "Bob"; // 当前来人是Bob
switch( who ) // 使用开头语句，控制对每个人的问候，以致于不问错对象
{
case "Bob":
alert( "Hello," + who );
break;
case "Jim":
alert( "Hello," + who );
break;
case "Tom":
alert( "Hello," + who );
break;
default:
alert( "Nobody~!");
}
</script>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>范例 5-5</title>
</head>
<body id="PageBody" style="background:red"><!--设定body节点的ID，以便在JavaScript代码中操作-->
<script language="javascript">
function ChangeBgColor( colorIndex )
{
var dombody = document.getElementById( "PageBody" ); // 获取body节点
if( dombody == null ) // 如果没有body节点将直接返回
{
return;
}
else // body节点成功获取
{
switch( colorIndex ) // 使用多路开关语句根据菜单传入的值更改网页背景
{
case 1:
dombody.style.background = "#666666"; // 通过设定style元素的background属性以改变背景
break;
case 2:
dombody.style.background = "#003333";
break;
case 3:
dombody.style.background = "#ccccff";
break;
case 4:
dombody.style.background = "#6699cc";
break;
default:
dombody.style.background = "white"; //
break;
}
}
}
</script>
<!--各颜色菜单，用户点击菜单时，背景颜色将变为与菜单相同的颜色-->
<div style="width: 100px; height: 20px; text-align:center; background-color: #666666;" onclick="return ChangeBgColor( 1 )">
</div>
<div style="width: 100px; height: 20px; text-align:center; background-color: #003333;" onclick="return ChangeBgColor( 2 )">
</div>
<div style="width: 100px; height: 20px; text-align:center; background-color: #ccccff;" onclick="return ChangeBgColor( 3 )">
</div>
<div style="width: 100px; height: 20px; text-align:center; background-color: #6699cc;" onclick="return ChangeBgColor( 4 )">
</div>
</body>
</html>
