方法一: 
 代码如下:
function gb2utf8(data){ 
 var glbEncode = []; 
 gb2utf8_data = data; 
 execScript("gb2utf8_data = MidB(gb2utf8_data, 1)", "VBScript"); 
 var t=escape(gb2utf8_data).replace(/%u/g,"").replace(/(.{2})(.{2})/g,"%$2%$1").replace(/%([A-Z].)%(.{2})/g,"@$1$2"); 
 t=t.split("@"); 
 var i=0,j=t.length,k; 
 while(++i
 k=t[i].substring(0,4); 
 if(!glbEncode[k]) 
 { 
 gb2utf8_char = eval("0x"+k); 
 execScript("gb2utf8_char = Chr(gb2utf8_char)", "VBScript"); 
 glbEncode[k]=escape(gb2utf8_char).substring(1,6); 
 } 
 t[i]=glbEncode[k]+t[i].substring(4); 
 } 
 gb2utf8_data = gb2utf8_char = null; 
 return unescape(t.join("%")); 
 } 
 
 使用时:xxx.innerHTML=gb2utf8(req.responseBody); 
方法二: 
 代码如下: