bug原因是奇妙的utf两字节标识符.解决办法如下
var oStream = new ActiveXObject("adodb" + ".stream");
oStream.Open();
oStream.LoadFromFile(map_path);
oStream.Charset = "utf-8";
oStream.Position = 0;
var inputdata = "";
var size=parseInt(oStream.Size);
try {
inputdata = oStream.ReadText();
} catch (error) {
alert("now running on debug mode,backup to avoid unknown result");
for(var offset=0;offset<10;offset++){
try {
oStream.Position = offset;
inputdata = oStream.ReadText(size-offset);
break;
} catch (error) {
}
}
}
oStream.Close();