html_encode and html_decode

code

        /**
	* 将含有html等特殊字符转义
	* 使用实例：$.html_encode("<p>li</p>")
	*/
	(function($){
		$.extend({"html_encode":function(str) {
			var s = "";
			if (str==null || typeof(str)=='undefined' || 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;
		},"html_decode":function(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;
		}});
	})(jQuery);