diff --git a/0218.js b/0218.js
new file mode 100644
index 0000000000000000000000000000000000000000..50b6a1afa60dca59a2e09edddc5acb2d914388e7
--- /dev/null
+++ b/0218.js
@@ -0,0 +1,17 @@
+var fs=require('fs');
+
+var time1=new Date().getTime();
+for (let i=1;i<=1000;i++){
+    fs.writeFileSync("./file/"+i+".txt","keke")
+}
+var time2=new Date().getTime();
+console.log("同步"+(time2-time1)+"ms")
+
+var time3=new Date().getTime();
+for (let i=1;i<=1000;i++){
+    fs.writeFile("./file/"+i+".txt","k",function(err){
+
+    });
+}
+var time4=new Date().getTime();
+console.log("异步"+(time4-time3)+"ms")
\ No newline at end of file
diff --git "a/2023-2-15-\346\250\241\345\235\227.md" "b/2023-2-15-\346\250\241\345\235\227.md"
new file mode 100644
index 0000000000000000000000000000000000000000..1f1bd0ca5a2703c80334201e59c17038fb33c186
--- /dev/null
+++ "b/2023-2-15-\346\250\241\345\235\227.md"
@@ -0,0 +1,30 @@
+ function add(a,b){
+    return a+b;
+}
+module.exports.add= add;
+
+function jian(a,b){
+    return a-b;
+}
+module.exports.jian= jian;
+ function cheng(a,b){
+    return a*b;
+}
+module.exports.cheng= cheng;
+function chu(a,b){
+    return a/b;
+}
+module.exports.chu= chu;
+
+
+
+const result = require("./jj.js");
+
+
+ 
+console.log(result);
+
+console.log(result.add(10,20));
+console.log(result.jian(10,20));
+console.log(result.cheng(10,20));
+console.log(result.chu(10,20));
diff --git a/cha.js b/cha.js
new file mode 100644
index 0000000000000000000000000000000000000000..89e3992ebbfceb34290a8b13d97f735cfde6117e
--- /dev/null
+++ b/cha.js
@@ -0,0 +1,14 @@
+let fs = require('fs');
+for(let i=0;i<=100;i++){
+fs.writeFileSync("./"+i+".txt",String(Math.floor(Math.random()*1001)))
+}
+let max=0;
+for(let i=1;i<=100;i++){
+let data=fs.readFileSync("./"+i+".txt");
+
+console.log(Number(data.toString()))
+if(Number(data.toString()>=max)){
+   max =Number(data.toString());
+}
+
+} console.log(max)
\ No newline at end of file