diff --git a/test1/fs/createWriteStream.js b/test1/fs/createWriteStream.js
new file mode 100644
index 0000000..49023e3
--- /dev/null
+++ b/test1/fs/createWriteStream.js
@@ -0,0 +1,18 @@
+const fs = require('fs')
+const writeStream = fs.createWriteStream('./output.txt')
+writeStream.write('hello world!')
+writeStream.write('hello world!\n')
+writeStream.write('hello world!\n')
+writeStream.write('hello world!\n')
+writeStream.write('hello world!\n')
+writeStream.write('hello world!\n')
+writeStream.write('hello world!\n')
+writeStream.write('hello world!\n')
+writeStream.write('hello world!\n')
+writeStream.write('hello world!\n')
+writeStream.write('hello world!\n')
+writeStream.write('hello world!\n')
+// end(): 等待缓冲区数据全部写完后再关闭流，触发 finish 事件，再触发 close 事件
+writeStream.end()
+// close(): 直接关闭流并释放资源，不会等待缓冲区数据写完，可能丢失未写入的数据
+writeStream.close()
diff --git a/test1/fs.js b/test1/fs/fs.js
similarity index 100%
rename from test1/fs.js
rename to test1/fs/fs.js
diff --git a/test1/fs/output.txt b/test1/fs/output.txt
new file mode 100644
index 0000000..0f9d399
--- /dev/null
+++ b/test1/fs/output.txt
@@ -0,0 +1,11 @@
+hello world!hello world!
+hello world!
+hello world!
+hello world!
+hello world!
+hello world!
+hello world!
+hello world!
+hello world!
+hello world!
+hello world!