JS escaping and unescaping HTML characters

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,"&lt;");
             s = s.replace(/>/g,"&gt;");
             s = s.replace(/ /g,"&nbsp;");
             s = s.replace(/\'/g,"&#39;");
             s = s.replace(/\"/g,"&quot;");
             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(/&amp;/g,"&");
             s = s.replace(/&lt;/g,"<");
             s = s.replace(/&gt;/g,">");
             s = s.replace(/&nbsp;/g," ");
             s = s.replace(/&#39;/g,"\'");
             s = s.replace(/&quot;/g,"\"");
             return s;  
       }
    };

Use similar  HtmlUtil.htmlDecode("—"), end.