How to read and write binary files using jscript _ javascript skills

This article mainly introduces how jscript reads and writes binary files. It involves the use of ActiveXObject objects in javascript and has some reference value, for more information about how to read and write binary files using jscript, see the following example. Share it with you for your reference. The specific implementation method is as follows:

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;  }}

Example:

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

I hope this article will help you design javascript programs.