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                # 網頁背景換膚 ~~~ <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>范例 5-5</title> <script language="javascript"> function ChangeBgColor( colorIndex ) { var dombody = document.getElementById( "PageBody" ); // 獲取body節點 if( dombody == null ) // 如果沒有body節點將直接返回 { return; } else // body節點成功獲取 { switch( colorIndex ) // 使用多路開關語句根據菜單傳入的值更改網頁背景 { case 1: dombody.style.background = "#666666"; // 通過設定style元素的background屬性以改變背景 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> </head> <body id="PageBody" style="background:red"><!--設定body節點的ID,以便在JavaScript代碼中操作--> <!--各顏色菜單,用戶點擊菜單時,背景顏色將變為與菜單相同的顏色--> <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> ~~~
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