<script>

var HtmlUtil = {

        /*1.用浏览器内部转换器实现html转码*/

        htmlEncode:function (html){

            //1.首先动态创建一个容器标签元素，如DIV

            var temp = document.createElement ("div");

            //2.然后将要转换的字符串设置为这个元素的innerText(ie支持)或者textContent(火狐，google支持)

            (temp.textContent != undefined ) ? (temp.textContent = html) : (temp.innerText = html);

            //3.最后返回这个元素的innerHTML，即得到经过HTML编码转换的字符串了

            var output = temp.innerHTML;

            temp = null;

            return output;

        },

        /*2.用浏览器内部转换器实现html解码*/

        htmlDecode:function (text){

            //1.首先动态创建一个容器标签元素，如DIV

            var temp = document.createElement("div");

            //2.然后将要转换的字符串设置为这个元素的innerHTML(ie，火狐，google都支持)

            temp.innerHTML = text;

            //3.最后返回这个元素的innerText(ie支持)或者textContent(火狐，google支持)，即得到经过HTML解码的字符串了。

            var output = temp.innerText || temp.textContent;

            temp = null;

            return output;

        },

        /*3.用正则表达式实现html转码*/

        htmlEncodeByRegExp:function (str){

             var s = "";

             if(str.length == 0) return "";

             s = str.replace(/&/g,"&");

             s = s.replace(/</g,"<");

             s = s.replace(/>/g,">");

             s = s.replace(/ /g," ");

             s = s.replace(/\'/g,"'");

             s = s.replace(/\"/g,""");

             return s;

       },

       /*4.用正则表达式实现html解码*/

       htmlDecodeByRegExp:function (str){

             var s = "";

             if(str.length == 0) return "";

             s = str.replace(/&/g,"&");

             s = s.replace(/</g,"<");

             s = s.replace(/>/g,">");

             s = s.replace(/ /g," ");

             s = s.replace(/'/g,"\'");

             s = s.replace(/"/g,"\"");

             return s;

       }

    };

</script>