diff --git "a/\351\231\210\351\222\212\351\224\213/03.02/demo.js" "b/\351\231\210\351\222\212\351\224\213/03.02/demo.js"
new file mode 100644
index 0000000000000000000000000000000000000000..341d050af1b6c6b83d7ee67019dbcf7b44a06a8a
--- /dev/null
+++ "b/\351\231\210\351\222\212\351\224\213/03.02/demo.js"
@@ -0,0 +1,30 @@
+// 创建个大文件，分别用传统方式于流方式，再计算下内存的消耗
+let startAt = Date.now();
+for (let i = 0; i < 50000; i++) {
+   let fd = fs.writeFileSync('demo01.txt','嘿嘿嘿\n',{flag:'a'});
+ 
+}
+let endAt = Date.now();
+console.log('简单文件时间消耗为：'+(endAt-startAt));
+let os = require("os");
+let startMes = os.freemem();
+let fd = fs.openSync("demo01.txt",'r');
+let bf1 = Buffer.alloc(3.28 * 1024 * 1024);
+fs.readSync(fd, bf1, 0, 3.28 * 1024 * 1024);
+let endMes = os.freemem();
+// console.log(startMes);
+// console.log(endMes);
+console.log("简单文件内存消耗为："+(startMes - endMes) / 1024 / 1024);
+//于流方式内存消耗计算
+let startMes1 = os.freemem();
+let readStream = fs.createReadStream('demo02.txt','utf-8');
+let startOn = Date.now();
+let writeStream = fs.createWriteStream('./demo02.txt',{flags:'a',autoClose:true});
+for(let i=0;i<20000;i++){
+    writeStream.write('你好啊\n');
+}
+let endOn = Date.now();
+let endMes1 = os.freemem();
+writeStream.close();
+console.log('流方式时间消耗为：'+(endOn-startOn));
+console.log("流文件内存消耗为："+(startMes1 - endMes1) / 1024 / 1024);