then.js is cool

来源：互联网发布：大街网知乎编辑：程序博客网时间：2024/05/16 10:42
 var CON_SERVER_ADDRESS = "";//服务器地址//声明nodejs功能对象var path = require('path');var http = require('http');var fs = require('fs');var exec = require('child_process').execFile;//var then = require('/thenjs/thenjs.js');//初始化当前exe运行的路径，后面很多地方要用var execPath = path.dirname(process.execPath);//读取本地配置文件，查看是否设置了服务器地址function ReadServerAddress_Async(next){    appconfig.read("_CON_SERVER_ADDRESS", function (addr)    {        //console.info(addr);        if (addr == "")        {            window.location.replace("choose-server.html");        }        else        {            CON_SERVER_ADDRESS = addr; //赋值            console.info("$$ 读取服务器地址：", addr);            next(null, CON_SERVER_ADDRESS);        }    });}//读取本地的最大版本文件，不含路径，应该返回 sonicc-9.05.zipfunction GetClientMaxAppName_Async(next){    fs.readdir(execPath + "\\app", function (err, files)    {        try        {            var clientVersion = 0;            var maxVersionFileName = "";            for (var i = 0; i < files.length; i++)            {                var ffn = path.basename(files[i], ".zip");                var tVersion = parseFloat(ffn.split('-')[1]);                //console.info("tVersion = " + tVersion);                if (tVersion > clientVersion)                    maxVersionFileName = ffn;            }            console.info("$$ 读取客户机最大版本：", maxVersionFileName);            next(null, maxVersionFileName);        }        catch (ex)        {            _WriteError(ex);            //出错后不回调是对的，因为退出按钮已经显示        }    });}//启动本地最新程序function RunMaxVersionClientFileName(){    var then = require('./node_modules/thenjs');    then(function (next)    {        GetClientMaxAppName_Async(next);          //读取客户端最大版本的文件    })    .then(function (next, res)    {        console.info("$$ 准备启动读取读取最大版本文件", res);        var nwjsPath = execPath + "\\nw.exe ";        var maxVerFl = execPath + "\\app\\" + res + ".zip ";        const spawn = require('child_process').spawn;        const child = spawn(nwjsPath, [maxVerFl], {            detached: true, //表示启动的进程是独立的        });    })}//检查服务器版本，是不是需要下载function CheckServerFile_Async(ClientMaxFileName, next){    $.GetOnlyAsync(CON_SERVER_ADDRESS + "/w8/home/CheckNeedUpdateClient?clientFileName=" + ClientMaxFileName, true,        function (res)        {            if (res.xException != null && res.xException != '')            {                _WriteError("连接服务器成功，但服务器内部异常:", ex);            }            else            {                next(null, res);            }        },        function (res)        {            _WriteError("连接服务器异常:", ex);        });}//下载最新文件function DownloadFileFromServer (url, dest, next){    var file = fs.createWriteStream(dest);    var request = http.get(url, function (res)    {        var fsize = res.headers['content-length'];        res.on('data', function (data)        {            file.write(data);            var progressCounter = Math.round(100 - (((fsize - file.bytesWritten) / fsize) * 100), 2);            $("#xProgressInfo").html(progressCounter + "%");        });        res.on('end', function ()        {            file.end();            next(null, null);        });    }).on('error', function (err)    {        fs.unlink(dest);        next(null, err.message);    });};$(document).ready(function (){    var then = require('./node_modules/thenjs');    then(function (next)    {        ReadServerAddress_Async(next);          //读取服务器地址，如果没有则转向    })    .then(function (next, res)    {        GetClientMaxAppName_Async(next);        //读取客户端最大版本的文件    })    .then(function (next, res)    {        console.info("$$ 客户机最大版本号", res);        CheckServerFile_Async(res, next)    })    .then(function (next, res)    {        console.info("$$ 看看是否需要下载 = " , res);        if (res.xNeed)        {            _WriteMsg("下载文件：" + res.xFileName);            DownloadFileFromServer(CON_SERVER_ADDRESS + "/w8/zo-content/client-down-package/" + res.xFileName,execPath + "\\app\\" + res.xFileName,next);        }        else        {            _WriteMsg("无需更新，准备启动...");            next(null, null);        }    })    .then(function (next, res)    {        console.info("$$ 准备启动");        RunMaxVersionClientFileName();    })});//辅助性函数//////////////////////////////////////////////////////////////////////////////////function _WriteMsg(msg){    $("#xsubMsg").html(msg);}function _WriteError(msg, ex){    $("#xsubMsg").html(msg + "<br>" + ex);    $("#btnQuitAndClear,#btnQuit").show();}//////////////////////////////////////////////////////////////////////////////////////////////
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