js 写文件流 方法

function writeFile(filecontent){ filecontent = new Date()+">>>"+filecontent;   var fso = new ActiveXObject("Scripting.FileSystemObject");     try{            file = fso.GetFile("D:\\logs\\test.txt");        }catch(e){            file = null;        }        if(!file){            //如果没有,创建文件            try{                  fso.CreateTextFile("D:\\logs\\test.txt",true);                file = fso.GetFile("D:\\logs\\test.txt");            }catch(Ee){                file = null;            }        }    if(file == null){            alert('创建本地文件失败,file==null');            return;        }    ts = file.OpenAsTextStream(8,true);        ts.WriteLine(filecontent);        ts.Close();}