JavaScript 实现 HTML 标签过滤功能示例

<!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>无标题文档</title>
<script>
window.onload=function()
{
  var oTxt1=document.getElementById('txt1');
  var oTxt2=document.getElementById('txt2');
  var oBtn=document.getElementById('btn');
  oBtn.onclick=function()
  {
    var reg=/<[^<>]+>/g;
    oTxt2.value=oTxt1.value.replace(reg,'');
  };
};
</script>
</head>
<body>
<textarea id="txt1" cols="40" rows="10"></textarea><br />
<input type="button" value="过滤" id="btn" /><br />
<textarea id="txt2" cols="40" rows="10"></textarea>
</body>
</html>