<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>讓HTML文本框textarea里的換行等格式用js保留下來</title>
</head>
<body>
<form id="form1" name="form1" method="post" action="">
<textarea name="textContent" cols="100" rows="15" id="textContent"></textarea> <br />
<input type="button" name="Submit" value="轉換輸出" onclick="outHTML()" />
<input name="checkbox" type="checkbox" id="checkbox" value="checkbox" checked="checked" />
<label for="checkbox" style="color:#F00">啟用轉換輸出</label>
</form>
<div id="out" style="border:1px solid #F90; padding:10px; background:#FFF8DC; margin-top:10px">請在上面文本框錄入帶HTML標記的文本測試！</div>
<script type="text/javascript">
function outHTML() {
var getValue=document.getElementById("textContent").value;
var endValue=((getValue.replace(/<(.+?)>/gi,"<$1>")).replace(//gi," ")).replace(/\n/gi,"|");
/* (1)轉義“<”、“>” (2)改半角空格為 (3)保留換行 */
if (document.getElementById("checkbox").checked==true) {
document.getElementById("out").innerHTML=endValue;
}else{
document.getElementById("out").innerHTML=getValue;
}
}
</script>
</body>
</html>