escape any html tap. 转义部分tap

excape.js

$('textarea')
  .val()
  .replace(/<([/^<>]*?((script)|(style)|(link)|(img)|(object)|(embed)|(textarea)|(input))[^<>]*?)>/g,"&lt;$1&gt;")
  .replace(/\n/g,"<br>");

textarea.html

<textarea name="" id="" cols="30" rows="10">
  <script>alert('测试');</script>
  <img src="http://www.baidu.com/img/bd_logo.png" alt="">
  <p>这是P标签</p>
  <div>这是div标签</div>
  <style>/*这个是style*/</style>
  <link rel="stylesheet" href="http://www.baidu.com">
</textarea>