diff --git "a/\346\235\216\346\254\247\351\233\257/2.21-node\344\273\213\347\273\215\344\270\216\346\250\241\345\235\227/moduleA.js" "b/\346\235\216\346\254\247\351\233\257/2.21-node\344\273\213\347\273\215\344\270\216\346\250\241\345\235\227/moduleA.js"
new file mode 100644
index 0000000000000000000000000000000000000000..8cd47ebf26de75c39d934855c6ddb505e9782c34
--- /dev/null
+++ "b/\346\235\216\346\254\247\351\233\257/2.21-node\344\273\213\347\273\215\344\270\216\346\250\241\345\235\227/moduleA.js"
@@ -0,0 +1,19 @@
+function add(a,b){
+    return a + b;
+}
+function reduce(a,b){
+    return a - b;
+}
+function multiple(a,b){
+    return a * b;
+}
+function divide(a,b){
+    return a / b;
+}
+//暴露
+module.exports = {
+    add:add,
+    reduce:reduce,
+    multiple:multiple,
+    divide:divide
+}
\ No newline at end of file
diff --git "a/\346\235\216\346\254\247\351\233\257/2.21-node\344\273\213\347\273\215\344\270\216\346\250\241\345\235\227/moduleB.js" "b/\346\235\216\346\254\247\351\233\257/2.21-node\344\273\213\347\273\215\344\270\216\346\250\241\345\235\227/moduleB.js"
new file mode 100644
index 0000000000000000000000000000000000000000..d12805bc576cbfbc19842f169f5359492a57176d
--- /dev/null
+++ "b/\346\235\216\346\254\247\351\233\257/2.21-node\344\273\213\347\273\215\344\270\216\346\250\241\345\235\227/moduleB.js"
@@ -0,0 +1,6 @@
+//引入moduleA模块
+let moduleA = require("./moduleA");
+console.log(moduleA.add(1.3,2));
+console.log(moduleA.reduce(1,2));
+console.log(moduleA.multiple(3,2));
+console.log(moduleA.divide(5,2));
\ No newline at end of file