<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>【javascript每日一練】- 根據選項設置背景顏色</title>
<script type="text/javascript">
function setProperty()
{
var content = document.getElementById("content");
var sel = document.getElementById("selectColor");
var propertyValue = sel.options[sel.selectedIndex].value;
content.style["background"] = propertyValue;
}
</script>
</head>
<body>
<div id="content">
<p>選擇顏色後點擊按鈕"設置背景顏色"。</p>
<select id="selectColor" >
<option value="aqua">aqua</option>
<option value="black">black</option>
<option value="blue">blue</option>
<option value="fuchsia">fuchsia</option>
<option value="gray">gray</option>
<option value="green">green</option>
<option value="lime">lime</option>
<option value="maroon">maroon</option>
<option value="navy">navy</option>
<option value="olive">olive</option>
<option value="purple">purple</option>
<option value="red">red</option>
<option value="silver">silver</option>
<option value="teal">teal</option>
<option value="white">white</option>
<option value="yellow">yellow</option>
</select>
<button onclick="setProperty(); return false;">設置背景顏色</button>
<br />
<br />
</div>
</body>
</html>
今天寫這個浪費了我很多時間，本來是很簡單的一個小代碼可我就是寫不出效果來了。最後在百般無奈下我尋求sunylost大神的幫助，一語中的。
奉上之前錯誤代碼，望各位避免。
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>【javascript每日一練】- 根據選項設置背景顏色</title>
<script type="text/javascript">
var content = document.getElementById("content");
function setProperty()
{
var sel = document.getElementById("selectColor");
var propertyValue = sel.options[sel.selectedIndex].value;
content.style["background"] = propertyValue;
}
</script>
</head>
<body>
<div id="content">
<p>選擇顏色後點擊按鈕"設置背景顏色"。</p>
<select id="selectColor" >
<option value="aqua">aqua</option>
<option value="black">black</option>
<option value="blue">blue</option>
<option value="fuchsia">fuchsia</option>
<option value="gray">gray</option>
<option value="green">green</option>
<option value="lime">lime</option>
<option value="maroon">maroon</option>
<option value="navy">navy</option>
<option value="olive">olive</option>
<option value="purple">purple</option>
<option value="red">red</option>
<option value="silver">silver</option>
<option value="teal">teal</option>
<option value="white">white</option>
<option value="yellow">yellow</option>
</select>
<button onclick="setProperty(); return false;">設置背景顏色</button>
<br />
<br />
</div>
</body>
</html>