diff --git "a/\346\236\227\346\242\205\346\240\252/2.15\344\275\234\344\270\232\346\250\241\345\235\227/out.js" "b/\346\236\227\346\242\205\346\240\252/2.15\344\275\234\344\270\232\346\250\241\345\235\227/out.js"
new file mode 100644
index 0000000000000000000000000000000000000000..0705df794c354970270d9232d907ebadf8767114
--- /dev/null
+++ "b/\346\236\227\346\242\205\346\240\252/2.15\344\275\234\344\270\232\346\250\241\345\235\227/out.js"
@@ -0,0 +1,7 @@
+let count=require("./suanfa");
+
+console.log(count.count(1,2,"add"));
+console.log(count.count(1,2,"sub"));
+console.log(count.count(1,2,"mul"));
+console.log(count.count(1,2,"div"));
+
diff --git "a/\346\236\227\346\242\205\346\240\252/2.15\344\275\234\344\270\232\346\250\241\345\235\227/suanfa.js" "b/\346\236\227\346\242\205\346\240\252/2.15\344\275\234\344\270\232\346\250\241\345\235\227/suanfa.js"
new file mode 100644
index 0000000000000000000000000000000000000000..8cee4b00a4a1749581c19f1b3090501c116ef62c
--- /dev/null
+++ "b/\346\236\227\346\242\205\346\240\252/2.15\344\275\234\344\270\232\346\250\241\345\235\227/suanfa.js"
@@ -0,0 +1,27 @@
+let count={
+    add:function(n1,n2){
+        return n1+n2;
+    },
+    sub:function(n1,n2){
+        return n1-n2;
+    },
+    mul:function(n1,n2){
+        return n1*n2;
+    },
+    div:function(n1,n2){
+        return n1/n2;
+    },
+
+    count:function(n1,n2,symbal){
+        if(!Number(n1)){
+            console.log("n1必须为数字");
+            return false;
+        }
+        if(!Number(n2)){
+            console.log("n2必须为数字");
+            return false;
+        }
+        return this[symbal](n1,n2);
+    }
+}
+module.exports = count;
\ No newline at end of file
diff --git "a/\346\236\227\346\242\205\346\240\252/2.16\344\275\234\344\270\232\346\226\207\344\273\266\350\257\273\345\217\226\344\270\212/number.js" "b/\346\236\227\346\242\205\346\240\252/2.16\344\275\234\344\270\232\346\226\207\344\273\266\350\257\273\345\217\226\344\270\212/number.js"
new file mode 100644
index 0000000000000000000000000000000000000000..ebce4566904d029c65a136c89412177c0d69fce0
--- /dev/null
+++ "b/\346\236\227\346\242\205\346\240\252/2.16\344\275\234\344\270\232\346\226\207\344\273\266\350\257\273\345\217\226\344\270\212/number.js"
@@ -0,0 +1,38 @@
+let fs = require("fs");
+//定义
+let sz=[];
+let max=0;
+let maxname=0;
+let min=1001;
+let minname=0;
+
+for(let i=1;i<101;i++){
+    //生成随机数
+    let shu=Math.ceil(Math.random()*1000);
+    //console.log('准备写入数据');
+
+    fs.writeFileSync("./"+i+".txt",""+ shu +"");
+   // console.log('写入成功');
+
+    //console.log('准备读取数据');
+    let read=fs.readFileSync("./"+i+".txt").toString();
+    //console.log("读取成功" +read);
+
+    sz[i]=read;
+
+    //max=sz.reduce((a,b)=>Math.max(a,b));
+    if(Number(sz[i])>max){
+        max=Number(sz[i]);
+        maxname=i;
+    }
+    if(Number(sz[i])<min){
+        min=Number(sz[i]);
+        minname=i;
+    }
+    
+
+}
+console.log("最大文件名"+maxname+".txt,最大值为"+max);
+console.log("最小文件名"+minname+".txt,最小值为"+min);
+
+
diff --git "a/\346\236\227\346\242\205\346\240\252/2.18\344\275\234\344\270\232\350\256\241\347\256\227\346\227\266\351\227\264/time.js" "b/\346\236\227\346\242\205\346\240\252/2.18\344\275\234\344\270\232\350\256\241\347\256\227\346\227\266\351\227\264/time.js"
new file mode 100644
index 0000000000000000000000000000000000000000..4e9c43949ececa70e80748eb4b027eeaeb41e6bd
--- /dev/null
+++ "b/\346\236\227\346\242\205\346\240\252/2.18\344\275\234\344\270\232\350\256\241\347\256\227\346\227\266\351\227\264/time.js"
@@ -0,0 +1,27 @@
+
+//作业2:生成1000个文件，用同步异步分别计算生成文件的时间.
+let fs = require("fs");
+var t1=new Date().getTime();
+
+for(let i=1;i<=1000;i++){
+
+    fs.writeFileSync("./a1/"+i+".txt","aa")
+
+}
+
+var t2=new Date().getTime();
+
+console.log("异步共花费"+(t2-t1)+"毫秒");
+
+var t3=new Date().getTime();
+
+for(let i=1;i<=1000;i++){
+
+    fs.writeFile("./a2/"+i+".txt","aa",function(err){})
+
+
+}
+
+var t4=new Date().getTime();
+
+console.log("异步共花费"+(t4-t3)+"毫秒");
diff --git "a/\346\236\227\346\242\205\346\240\252/zhuzhu.txt" "b/\346\236\227\346\242\205\346\240\252/zhuzhu.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..5e57dd8cef2b403146946f5b507a69fa7668cce4
--- /dev/null
+++ "b/\346\236\227\346\242\205\346\240\252/zhuzhu.txt"
@@ -0,0 +1 @@
+坨学，里在干绳么