惊呆了，原来可读流和可写流如此简单！

var fs = require("fs");

//创建可读流
var readStream = fs.createReadStream("./capture-1.avi");

//创建可写流
var writeStream = fs.createWriteStream("./04.avi");

//监听数据读取事件
readStream.on("data",function(chunk){
    console.log(chunk);
    //将数据写入文件中
    writeStream.write(chunk);
})

//监听读取完毕
readStream.on("end",function(){
    //写入操作结束
    writeStream.end();
})