text-html 转译

    var HtmlUtil = {
 2         /*1.用浏览器内部转换器实现html编码（转义）*/
 3         htmlEncode:function (html){
 4             //1.首先动态创建一个容器标签元素，如DIV
 5             var temp = document.createElement ("div");
 6             //2.然后将要转换的字符串设置为这个元素的innerText或者textContent
 7             (temp.textContent != undefined ) ? (temp.textContent = html) : (temp.innerText = html);
 8             //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
 9             var output = temp.innerHTML;
10             temp = null;
11             return output;
12         },
13         /*2.用浏览器内部转换器实现html解码（反转义）*/
14         htmlDecode:function (text){
15             //1.首先动态创建一个容器标签元素，如DIV
16             var temp = document.createElement("div");
17             //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)
18             temp.innerHTML = text;
19             //3.最后返回这个元素的innerText或者textContent，即得到经过HTML解码的字符串了。
20             var output = temp.innerText || temp.textContent;
21             temp = null;
22             return output;
23         },
24         /*3.用正则表达式实现html编码（转义）*/
25         htmlEncodeByRegExp:function (str){  
26              var temp = "";
27              if(str.length == 0) return "";
28              temp = str.replace(/&/g,"&");
29              temp = temp.replace(/</g,"&lt;");
30              temp = temp.replace(/>/g,"&gt;");
31              temp = temp.replace(/\s/g,"&nbsp;");
32              temp = temp.replace(/\'/g,"&#39;");
33              temp = temp.replace(/\"/g,"&quot;");
34              return temp;
35         },
36         /*4.用正则表达式实现html解码（反转义）*/
37         htmlDecodeByRegExp:function (str){  
38              var temp = "";
39              if(str.length == 0) return "";
40              temp = str.replace(/&amp;/g,"&");
41              temp = temp.replace(/&lt;/g,"<");
42              temp = temp.replace(/&gt;/g,">");
43              temp = temp.replace(/&nbsp;/g," ");
44              temp = temp.replace(/&#39;/g,"\'");
45              temp = temp.replace(/&quot;/g,"\"");
46              return temp;  
47         },
48         /*5.用正则表达式实现html编码（转义）（另一种写法）*/
49         html2Escape:function(sHtml) {
50              return sHtml.replace(/[<>&"]/g,function(c){return {'<':'&lt;','>':'&gt;','&':'&amp;','"':'&quot;'}[c];});
51         },
52         /*6.用正则表达式实现html解码（反转义）（另一种写法）*/
53         escape2Html:function (str) {
54              var arrEntities={'lt':'<','gt':'>','nbsp':' ','amp':'&','quot':'"'};
55              return str.replace(/&(lt|gt|nbsp|amp|quot);/ig,function(all,t){return arrEntities[t];});
56         }
57     };