兩種思路，一種是列出需要用到的轉義項，通過正則來轉化；另一種通過轉化為html語言，通過瀏覽器幫助我們翻譯，然后獲取innerText

var HtmlUtil = {/*1.用瀏覽器內部轉換器實現html編碼（轉義）*/htmlEncode:function (html){//1.首先動態創建一個容器標簽元素，如DIVvar temp = document.createElement ("div");//2.然后將要轉換的字符串設置為這個元素的innerText或者textContent(temp.textContent != undefined ) ? (temp.textContent = html) : (temp.innerText = html);//3.最后返回這個元素的innerHTML，即得到經過HTML編碼轉換的字符串了var output = temp.innerHTML;temp = null;return output;},/*2.用瀏覽器內部轉換器實現html解碼（反轉義）*/htmlDecode:function (text){//1.首先動態創建一個容器標簽元素，如DIVvar temp = document.createElement("div");//2.然后將要轉換的字符串設置為這個元素的innerHTML(ie，火狐，google都支持)temp.innerHTML = text;//3.最后返回這個元素的innerText或者textContent，即得到經過HTML解碼的字符串了。var output = temp.innerText || temp.textContent;temp = null;return output;},/*3.用正則表達式實現html編碼（轉義）*/htmlEncodeByRegExp:function (str){var temp = "";if(str.length == 0) return "";temp = str.replace(/&/g,"&");temp = temp.replace(/</g,"<");temp = temp.replace(/>/g,">");temp = temp.replace(/\s/g," ");temp = temp.replace(/\'/g,"'");temp = temp.replace(/\"/g,""");return temp;},/*4.用正則表達式實現html解碼（反轉義）*/htmlDecodeByRegExp:function (str){var temp = "";if(str.length == 0) return "";temp = str.replace(/&/g,"&");temp = temp.replace(/</g,"<");temp = temp.replace(/>/g,">");temp = temp.replace(/ /g," ");temp = temp.replace(/'/g,"\'");temp = temp.replace(/"/g,"\"");return temp;},/*5.用正則表達式實現html編碼（轉義）（另一種寫法）*/html2Escape:function(sHtml) {return sHtml.replace(/[<>&"]/g,function(c){return {'<':'<','>':'>','&':'&','"':'"'}[c];});},/*6.用正則表達式實現html解碼（反轉義）（另一種寫法）*/escape2Html:function (str) {var arrEntities={'lt':'<','gt':'>','nbsp':' ','amp':'&','quot':'"'};return str.replace(/&(lt|gt|nbsp|amp|quot);/ig,function(all,t){return arrEntities[t];});}};