需求：點選button取得input框中選取的內容，讓選取的內容變紅，
實作：程式碼如下
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>Test</title>
<style type="text/css">
div{
display: none;
}
</style>
</head>
<body>
<input type="text" id="txt" value="" />
<input type="button" value="获取文本框内的值" id="btn" onclick="getText();"/>
<div id="showText">
</div>
<script type="text/javascript">
function getText () {
var showText = document.getElementById("showText");
showText.style.display = "block";
showText.style.color = "red";
showText.innerHTML=document.getElementById("txt").value;
}
</script>
</body>
</html>效果：
