diff --git "a/\351\251\254\351\235\222\351\235\222/2.22\344\275\234\344\270\232/index.js" "b/\351\251\254\351\235\222\351\235\222/2.22\344\275\234\344\270\232/index.js"
new file mode 100644
index 0000000000000000000000000000000000000000..fca410ac0333a9e9497be184c6d3e25ee25f9342
--- /dev/null
+++ "b/\351\251\254\351\235\222\351\235\222/2.22\344\275\234\344\270\232/index.js"
@@ -0,0 +1,24 @@
+//加
+function add(num1,num2){
+    num3 = num1+num2;
+    return num3;
+}
+//减
+function minus(num1,num2){
+    num4 = num1-num2;
+    return num4;
+}
+//乘
+function ride(num1,num2){
+    num5 =num1*num2;
+    return num5;
+}
+//除
+function divide(num1,num2){
+    num6 =num1/num2;
+    return num6;
+}
+console.log(add(5,2));
+console.log(minus(8,5));
+console.log(ride(3,4));
+console.log(divide(8,4));
\ No newline at end of file
diff --git "a/\351\251\254\351\235\222\351\235\222/2.22\344\275\234\344\270\232/package.json" "b/\351\251\254\351\235\222\351\235\222/2.22\344\275\234\344\270\232/package.json"
new file mode 100644
index 0000000000000000000000000000000000000000..ed8b3064d4f91e47985f9ac5757a5ed30f06574c
--- /dev/null
+++ "b/\351\251\254\351\235\222\351\235\222/2.22\344\275\234\344\270\232/package.json"
@@ -0,0 +1,11 @@
+{
+  "name": "1",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC"
+}
diff --git "a/\351\251\254\351\235\222\351\235\222/2.24 \344\275\234\344\270\232/fileplay.js" "b/\351\251\254\351\235\222\351\235\222/2.24 \344\275\234\344\270\232/fileplay.js"
new file mode 100644
index 0000000000000000000000000000000000000000..3b71dca7a437b5a002f5a74f6137c3abbde9bd96
--- /dev/null
+++ "b/\351\251\254\351\235\222\351\235\222/2.24 \344\275\234\344\270\232/fileplay.js"	
@@ -0,0 +1,17 @@
+let fs = require('fs');
+let str = 'Hello world';
+let filename = 'index.txt';
+
+fs.open(filename,'a',(err,fd)=>{
+    if(err){
+        console.log(err.message);
+    }else{
+        fs.write(fd,str,(err,bytes)=>{
+            if(err){
+                console.log(err.message);
+            }else{
+                console.log(bytes +'bytes written');
+            }
+        })
+    }
+})
\ No newline at end of file
diff --git "a/\351\251\254\351\235\222\351\235\222/2.24 \344\275\234\344\270\232/index.txt" "b/\351\251\254\351\235\222\351\235\222/2.24 \344\275\234\344\270\232/index.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..70c379b63ffa0795fdbfbc128e5a2818397b7ef8
--- /dev/null
+++ "b/\351\251\254\351\235\222\351\235\222/2.24 \344\275\234\344\270\232/index.txt"	
@@ -0,0 +1 @@
+Hello world
\ No newline at end of file