diff --git "a/\346\210\264\344\275\263\350\276\211/20230218-\345\274\202\345\220\214\346\255\245\346\226\207\344\273\266\345\206\231\345\205\245/file.js" "b/\346\210\264\344\275\263\350\276\211/20230218-\345\274\202\345\220\214\346\255\245\346\226\207\344\273\266\345\206\231\345\205\245/file.js"
index cd2536e5f4d4430ac0f42a20574f5ecd1938caa8..6d1ee595693c9c6c676261fc53e35fba07ebca3d 100644
--- "a/\346\210\264\344\275\263\350\276\211/20230218-\345\274\202\345\220\214\346\255\245\346\226\207\344\273\266\345\206\231\345\205\245/file.js"
+++ "b/\346\210\264\344\275\263\350\276\211/20230218-\345\274\202\345\220\214\346\255\245\346\226\207\344\273\266\345\206\231\345\205\245/file.js"
@@ -35,12 +35,15 @@ setTimeout(() => {
 // 异步写入
 setTimeout(() => {
     var t1=new Date().getTime();
+    var num =0;
     for(let j=0;j<1000;j++){
         var nowDate = new Date();
         var fileName = "./files/D"+j;
         fs.writeFile(fileName,"写入文件的时间戳为:"+nowDate.getTime()+"ms,写入文件的时间为:"+nowDate.toLocaleString(),(error,data)=>{});
+        num++;
+        if(num ==1000){
+            var t2=new Date().getTime();
+            console.log("异步创建1000个文件消耗的时间为："+(t2-t1)+"ms");
+        }
     }
-    var t2=new Date().getTime();
-    console.log("异步创建1000个文件消耗的时间为："+(t2-t1)+"ms");
-}, 2500);
-
+}, 2500);
\ No newline at end of file
diff --git "a/\346\210\264\344\275\263\350\276\211/20230220-\346\226\207\344\273\266\346\265\201/file.js" "b/\346\210\264\344\275\263\350\276\211/20230220-\345\206\231\345\205\245\346\226\207\344\273\266\346\265\201/file.js"
similarity index 100%
rename from "\346\210\264\344\275\263\350\276\211/20230220-\346\226\207\344\273\266\346\265\201/file.js"
rename to "\346\210\264\344\275\263\350\276\211/20230220-\345\206\231\345\205\245\346\226\207\344\273\266\346\265\201/file.js"
diff --git "a/\346\210\264\344\275\263\350\276\211/20230222-\346\225\260\346\215\256\345\272\223\346\250\241\345\235\227\345\242\236\345\210\240\346\224\271\346\237\245/db.js" "b/\346\210\264\344\275\263\350\276\211/20230222-\346\225\260\346\215\256\345\272\223\346\250\241\345\235\227\345\242\236\345\210\240\346\224\271\346\237\245/db.js"
new file mode 100644
index 0000000000000000000000000000000000000000..7f40c9568a615f64caa8b07e6651348546b0912d
--- /dev/null
+++ "b/\346\210\264\344\275\263\350\276\211/20230222-\346\225\260\346\215\256\345\272\223\346\250\241\345\235\227\345\242\236\345\210\240\346\224\271\346\237\245/db.js"
@@ -0,0 +1,48 @@
+//作业：建一个用户表（有姓名,年龄,性别,创建时间,修改时间）,使用模块加mysql模块,实现对数据的增删改查
+//npm init  初始化模块
+//npm install mysql 安装sql模块
+
+let mysql = require("mysql");
+
+let connection = mysql.createConnection({host:"localhost",user:"root",password:"root",port:"3306",database:"d"});
+connection.connect();
+//创建数据库代码
+// create table user (
+// 	user_id int primary key auto_increment,
+// 	user_name varchar (255),
+// 	user_year int ,
+// 	user_sex varchar(50),
+// 	user_createTime datetime,
+// 	user_updateTime	datetime default null
+// );
+
+// 查询数据库所有数据
+let sql = "select * from user ";
+connection.query(sql,(err,data)=>{
+    console.log(data);
+    // connection.end();
+})
+
+//新增数据
+let insertsql = "insert into user(`user_id`,`user_name`,`user_year`,`user_sex`,`user_createTime`) values(null,'张三','18','女',now());";
+connection.query(insertsql,(err,data)=>{
+    console.log(data);
+})
+
+//修改数据
+let updatesql = "update user set `user_name`='小明',`user_updateTime`=now() where user_id=1;";
+connection.query(updatesql,(err,data)=>{
+    console.log(data);
+})
+
+//删除数据
+let deletesql = "delete from user where `user_id`=3;";
+connection.query(deletesql,(err,data)=>{
+    console.log(data);
+    
+})
+connection.query(sql,(err,data)=>{
+    console.log(data);
+})
+connection.end();
+
diff --git "a/\346\210\264\344\275\263\350\276\211/20230223-node\346\225\260\346\215\256\345\272\223/db.js" "b/\346\210\264\344\275\263\350\276\211/20230223-node\346\225\260\346\215\256\345\272\223/db.js"
new file mode 100644
index 0000000000000000000000000000000000000000..3d8eaf3f287b692082f4872b59b56a267913f40d
--- /dev/null
+++ "b/\346\210\264\344\275\263\350\276\211/20230223-node\346\225\260\346\215\256\345\272\223/db.js"
@@ -0,0 +1,45 @@
+//实现分页,能实现男女个数和总数的统计,能统计出（小于18） 和 18-45 和 45岁以上的人数（可以的话一条sql,分组,如果不能行就写多个sql统计）
+
+let mysql = require("mysql");
+let connection = mysql.createConnection({host:'localhost',user:'root',password:'root',port:'3306',database:'class7'});
+connection.connect();
+
+let name = "小明";
+let sex = "男";
+let year = "17";
+
+let name1 = "张三";
+let sex1 = "男";
+let year1 = "18";
+
+
+let name2 = "李四";
+let sex2 = "男";
+let year2 = "19";
+
+let name3 = "王五";
+let sex3 = "女";
+let year3 = "20";
+
+let name4 = "老六";
+let sex4 = "男";
+let year4 = "45";
+
+let name5 = "小七";
+let sex5 = "女";
+let year5 = "48";
+
+let insertsql = "insert into user(`user_name`,`user_sex`,`user_year`) values(?,?,?)";
+// connection.query(insertsql,[name,sex,year],()=>{})
+// connection.query(insertsql,[name1,sex1,year1],()=>{})
+// connection.query(insertsql,[name2,sex2,year2],()=>{})
+// connection.query(insertsql,[name3,sex3,year3],()=>{})
+// connection.query(insertsql,[name4,sex4,year4],()=>{})
+// connection.query(insertsql,[name5,sex5,year5],()=>{})
+
+//实现分页,能实现男女个数和总数的统计,能统计出（小于18） 和 18-45 和 45岁以上的人数（可以的话一条sql,分组,如果不能行就写多个sql统计）
+let selectsql = "select `user_sex` as `性别`,count(*) as `个数` from user group by user_sex;"
+connection.query(selectsql,(err,data)=>{
+    console.log(data);
+});
+connection.end();
\ No newline at end of file
diff --git "a/\346\210\264\344\275\263\350\276\211/20230223-node\346\225\260\346\215\256\345\272\223/package-lock.json" "b/\346\210\264\344\275\263\350\276\211/20230223-node\346\225\260\346\215\256\345\272\223/package-lock.json"
new file mode 100644
index 0000000000000000000000000000000000000000..4df7708343b6058cac76b7b465d95e60930ff9cc
--- /dev/null
+++ "b/\346\210\264\344\275\263\350\276\211/20230223-node\346\225\260\346\215\256\345\272\223/package-lock.json"
@@ -0,0 +1,98 @@
+{
+  "name": "a",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "a",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "mysql": "^2.18.1"
+      }
+    },
+    "node_modules/bignumber.js": {
+      "version": "9.0.0",
+      "resolved": "https://registry.npmmirror.com/bignumber.js/-/bignumber.js-9.0.0.tgz",
+      "integrity": "sha512-t/OYhhJ2SD+YGBQcjY8GzzDHEk9f3nerxjtfa6tlMXfe7frs/WozhvCNoGvpM0P3bNf3Gq5ZRMlGr5f3r4/N8A==",
+      "engines": {
+        "node": "*"
+      }
+    },
+    "node_modules/core-util-is": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmmirror.com/core-util-is/-/core-util-is-1.0.3.tgz",
+      "integrity": "sha512-ZQBvi1DcpJ4GDqanjucZ2Hj3wEO5pZDS89BWbkcrvdxksJorwUDDZamX9ldFkp9aw2lmBDLgkObEA4DWNJ9FYQ=="
+    },
+    "node_modules/inherits": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmmirror.com/inherits/-/inherits-2.0.4.tgz",
+      "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ=="
+    },
+    "node_modules/isarray": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmmirror.com/isarray/-/isarray-1.0.0.tgz",
+      "integrity": "sha512-VLghIWNM6ELQzo7zwmcg0NmTVyWKYjvIeM83yjp0wRDTmUnrM678fQbcKBo6n2CJEF0szoG//ytg+TKla89ALQ=="
+    },
+    "node_modules/mysql": {
+      "version": "2.18.1",
+      "resolved": "https://registry.npmmirror.com/mysql/-/mysql-2.18.1.tgz",
+      "integrity": "sha512-Bca+gk2YWmqp2Uf6k5NFEurwY/0td0cpebAucFpY/3jhrwrVGuxU2uQFCHjU19SJfje0yQvi+rVWdq78hR5lig==",
+      "dependencies": {
+        "bignumber.js": "9.0.0",
+        "readable-stream": "2.3.7",
+        "safe-buffer": "5.1.2",
+        "sqlstring": "2.3.1"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/process-nextick-args": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmmirror.com/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+      "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag=="
+    },
+    "node_modules/readable-stream": {
+      "version": "2.3.7",
+      "resolved": "https://registry.npmmirror.com/readable-stream/-/readable-stream-2.3.7.tgz",
+      "integrity": "sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==",
+      "dependencies": {
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~2.0.0",
+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.1.1",
+        "util-deprecate": "~1.0.1"
+      }
+    },
+    "node_modules/safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmmirror.com/safe-buffer/-/safe-buffer-5.1.2.tgz",
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+    },
+    "node_modules/sqlstring": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmmirror.com/sqlstring/-/sqlstring-2.3.1.tgz",
+      "integrity": "sha512-ooAzh/7dxIG5+uDik1z/Rd1vli0+38izZhGzSa34FwR7IbelPWCCKSNIl8jlL/F7ERvy8CB2jNeM1E9i9mXMAQ==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmmirror.com/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "dependencies": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmmirror.com/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw=="
+    }
+  }
+}
diff --git "a/\346\210\264\344\275\263\350\276\211/20230223-node\346\225\260\346\215\256\345\272\223/package.json" "b/\346\210\264\344\275\263\350\276\211/20230223-node\346\225\260\346\215\256\345\272\223/package.json"
new file mode 100644
index 0000000000000000000000000000000000000000..0c1dcdfc6d4927402fea09af9ade7fe6171f483c
--- /dev/null
+++ "b/\346\210\264\344\275\263\350\276\211/20230223-node\346\225\260\346\215\256\345\272\223/package.json"
@@ -0,0 +1,14 @@
+{
+  "name": "a",
+  "version": "1.0.0",
+  "description": "",
+  "main": "db.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "mysql": "^2.18.1"
+  }
+}