求教两种文字编码的转换解决思路

求教两种文字编码的转换
如何把这段编码：

<table width="100">
  <tr>
  <td>我爱你</td>
  </tr>
</table>


转化成为：
&lt;table width=&quot;100&quot;&gt;\n &lt;tr&gt;\n &lt;td&gt;我爱你&lt;/td&gt;\n &lt;/tr&gt;\n&lt;/table&gt;

这两个编码应该如何转换，最好能给我个 javascript

[解决办法]

JScript code

<script>    var code = '<table width="100"><tr><td>我爱你</td></tr></table>'.replace(/(\<)/g, " &lt; ");    code = code.replace(/(\>)/g, "&gt; ");    code = code.replace(/(\")/g, "&quot; ");    alert(code);</script>
[解决办法]
JScript code
function ToHtmlEnCode(str)  {var s = "";if (str.length == 0) return "";s = str.replace(/&/g, "&amp;");s = s.replace(/</g, "&lt;");s = s.replace(/>/g, "&gt;");s = s.replace(/ /g, "&nbsp;");s = s.replace(/\'/g, "'");s = s.replace(/\"/g, "&quot;");s = s.replace(/\n/g, "<br>");return s;} function ToHTMLDeCode(str)  {var s = "";if (str.length == 0) return "";s = str.replace(/&amp;/g, "&");s = s.replace(/&lt;/g, "<");s = s.replace(/&gt;/g, ">");s = s.replace(/&nbsp;/g, " ");s = s.replace(/'/g, "\'");s = s.replace(/&quot;/g, "\"");s = s.replace(/<br>/g, "\n");return s;}var html = '<table width="100">&<tr><td>我爱你</td></tr></table>'html = ToHtmlEnCode(html)alert(html)html = ToHTMLDeCode(html)alert(html)