diff --git "a/\344\275\234\344\270\232\346\217\220\344\272\244/20220221zuoye/demo1.js" "b/\344\275\234\344\270\232\346\217\220\344\272\244/20220221zuoye/demo1.js"
new file mode 100644
index 0000000000000000000000000000000000000000..c2995b73ba67d91ff4cfa1f2f3262ac774a4fc0b
--- /dev/null
+++ "b/\344\275\234\344\270\232\346\217\220\344\272\244/20220221zuoye/demo1.js"
@@ -0,0 +1,27 @@
+console.log("hello world");
+//jia
+let add=function(arg1,arg2){
+    console.log(arg1+arg2)
+}
+
+//jian
+let sub=function(arg1,arg2){
+    console.log(arg1-arg2)
+}
+
+//chen
+let mul=function(arg1,arg2){
+    console.log(arg1*arg2)
+}
+
+//chu
+let div=function(arg1,arg2){
+    console.log(arg1/arg2)
+}
+
+module.exports={
+    add:add,
+    sub:sub,
+    mul:mul,
+    div:div
+}
\ No newline at end of file
diff --git "a/\344\275\234\344\270\232\346\217\220\344\272\244/20220221zuoye/demo2.js" "b/\344\275\234\344\270\232\346\217\220\344\272\244/20220221zuoye/demo2.js"
new file mode 100644
index 0000000000000000000000000000000000000000..015e27bfb21d612d6442750a8b68587425f42a41
--- /dev/null
+++ "b/\344\275\234\344\270\232\346\217\220\344\272\244/20220221zuoye/demo2.js"
@@ -0,0 +1,6 @@
+let jisuan=require("./demo1")
+
+jisuan.add(1,2)
+jisuan.sub(10,8)
+jisuan.mul(1,3)
+jisuan.div(8,2)
\ No newline at end of file