diff --git "a/why/\346\250\241\345\235\227\344\275\234\344\270\232/demo1.js" "b/why/\346\250\241\345\235\227\344\275\234\344\270\232/demo1.js"
new file mode 100644
index 0000000000000000000000000000000000000000..a9d2dd4a5bd1250d7a876636878d12a7c9cd9bb7
--- /dev/null
+++ "b/why/\346\250\241\345\235\227\344\275\234\344\270\232/demo1.js"
@@ -0,0 +1,15 @@
+let obj ={
+    'jia':function(){
+        return("a+b");
+    },
+    'jian':function(){
+        return('a-b');
+    },
+    'cheng':function(){
+        return('a*b');
+    },
+    'chu':function(){
+        return('a/b');
+    }
+}
+module.exports= obj;
\ No newline at end of file
diff --git "a/why/\346\250\241\345\235\227\344\275\234\344\270\232/demo2.js" "b/why/\346\250\241\345\235\227\344\275\234\344\270\232/demo2.js"
new file mode 100644
index 0000000000000000000000000000000000000000..520e0c9665cb5e6c54bbdab9fb381a12745ba188
--- /dev/null
+++ "b/why/\346\250\241\345\235\227\344\275\234\344\270\232/demo2.js"
@@ -0,0 +1,7 @@
+let obj=require("./demo1.js");
+var a=1
+var b=2
+console.log(obj.jia(a,b));
+console.log(obj.jian(a,b));
+console.log(obj.cheng(a,b));
+console.log(obj.chu(a,b));