diff --git "a/\345\274\240\346\200\235\345\251\267/3.js" "b/\345\274\240\346\200\235\345\251\267/3.js"
new file mode 100644
index 0000000000000000000000000000000000000000..0099a4ed25487de849a79cd44a57728f33c06590
--- /dev/null
+++ "b/\345\274\240\346\200\235\345\251\267/3.js"
@@ -0,0 +1,31 @@
+//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 fs = require("fs");
+let os = require("os");
+//传统方式
+let startTime = Date.now();
+let start = os.freemem();
+let fd = fs.openSync("bigFile.txt", 'a');
+for (let i = 0; i < 20000; i++) {
+    fs.writeSync(fd, "真的会蒜Q\n");
+}
+let end = os.freemem();
+let diff = ((start - end) / 1024 / 1024);
+let endTime = Date.now();
+let diffTime = ((endTime-startTime)/1000);
+console.log("传统方式的空闲内存量：" + diff);
+console.log("传统方式的时间消耗：" + diffTime);
+fs.closeSync(fd);
+//流方式
+let startTime2 = Date.now();
+let start2 = os.freemem();
+let stream = fs.createWriteStream("bigFile2.txt", "utf-8", { flag: "a" });
+for (let j = 0; j < 20000; j++) {
+    stream.write("蒜Q\n");
+}
+let end2 = os.freemem();
+let endTime2 = Date.now();
+let diffTime2 = ((endTime2-startTime2)/1000);
+let diff2 = ((start2 - end2) / 1024 / 1024);
+console.log("流方式的空闲内存量：" + diff2);
+console.log("传统方式的时间消耗：" + diffTime2);
+stream.close();
\ No newline at end of file