jscript读写二进制文件的方法

var bin = new Array(256);for(var i=0;i<256;i++){  bin[i]=String.fromCharCode(i);}function TestWrite(){  var Stream = new ActiveXObject("ADODB.Stream");  var adTypeBinary=1,adTypeText=2;  Stream.Type = adTypeText;  Stream.CharSet = "iso-8859-1";  Stream.Open();  //Stream.WriteText("/x00/x01/x02/xff/xff");  for(var i=0;i<256;i++){    Stream.WriteText(String.fromCharCode(i));    //Stream.WriteText(bin[i]);  }  Stream.SaveToFile("c://windows//temp//test.bin", 2);  Stream.Close();  Stream = null;}function BinaryFile(filepath){  var adTypeBinary=1,adTypeText=2;  var adSaveCreateNotExist=1,adSaveCreateOverWrite=2;  var adReadAll=-1,adReadLine=-2;  this.path=filepath;  this.WriteAll = function(content){    var Stream = new ActiveXObject("ADODB.Stream");    Stream.Type = adTypeText;    Stream.CharSet = "iso-8859-1";    Stream.Open();    Stream.WriteText(content);    Stream.SaveToFile(this.path, adSaveCreateOverWrite);    Stream.Close();    Stream = null;  }  this.ReadAll = function(){    var Stream = new ActiveXObject("ADODB.Stream");    Stream.Type = adTypeText;    Stream.CharSet = "iso-8859-1";    Stream.Open();    Stream.LoadFromFile(this.path);    var content = Stream.ReadText(adReadAll);    Stream.Close();    Stream = null;    return content;  }}

var crFolder = 'C:/Temp/cr'var bf1=new BinaryFile(crFolder+"/PCDV0026.JPG");var bf2=new BinaryFile(crFolder+"/PCDV0026_.JPG");bf2.WriteAll(bf1.ReadAll());