Unicode码转换工具

<textarea  rows="20" id="code" style="WIDTH: 70%"></textarea>
<p>
<input type="button" onclick="encode(code,this)" value="转化" />
<script>
var mode="zhuan";
function encode(obj,btn){
	if(mode=="zhuan"){
		obj.value=obj.value.replace(/[^\u0000-\u00FF]/g,function($0){return escape($0).replace(/(%u)(\w{4})/gi,"\\u$2")});
		btn.value="还原";
		mode="huan";
	}else{
		obj.value=unescape(obj.value.replace(/\\u/g,'%u').replace(/;/g,''));
		btn.value="转化";
		mode="zhuan";
	}
}
</script>