尝试过各种办法，百度都翻了好几篇了。，还是没解决 代码如下。

filePath = "D:/web/4.jpg"; function readFile(filePath,response) { filePath = path.join(filePath);

var ContentType;
if(filePath.lastIndexOf(".") == -1)
    throw new Error("Directory is not support download!");
var fileType = filePath.substring(filePath.lastIndexOf(".")+1);//文件类型
ContentType = config.MIME_TYPES[fileType]||"application/octet-stream";
fs.exists(filePath,function(exists){
    if (exists) {
        var rOption = {
            flags : 'r',
            encoding : null,
            fd: null,
            mode : 0666,
            autoClose: true
        }
        if(config.DEBUG)
            console.log("["+core.time()+"] GET files:"+filePath);
        var ReadStream = fs.createReadStream(filePath,rOption);
        ReadStream.on('data',function(data){
            response.write(data);
        });
  //ReadStream.on("data",function(data)
  //{
    //response.write(data);
  //});
        ReadStream.on("error", function() {
            if(config.DEBUG)
                console.log("["+core.time()+"] read files:"+filePath+" has an error!");
            response.writeHead(404,{"Content-Type": "text/plain"}); 
            response.end();
        });
        response.writeHead(200, {"Content-Type": ContentType});
        ReadStream.pipe(response);
        //response.write(filePath);
        ReadStream.on("end", function() {
            //数据发送完毕
            if(config.DEBUG)
                console.log("["+core.time()+"] read files:"+filePath+" success!");
            response.end();
        });
    }else{
        if(config.DEBUG)
            console.log("["+core.time()+"] files:"+filePath+" not exist!");
        response.writeHead(404,{"Content-Type": "text/plain"});
        response.end();
    }
});

}

假如按上面那种方式，浏览器一片空白。没有任何图片下载或显示 假如将ReadStream.pipe(response);注释掉 将//ReadStream.on("data",function(data) //{ //response.write(data); //}); 解除注释，可以触发end方法。 我确定文件存在的。 因为console.log("[“+core.time()+”] GET files:"+filePath);这句可以在cmd中显示出来 response.write(data);始终返回的null 是不是这个版本的api有问题阿。为什么一直都不行呢？还是说有其他的问题？