diff --git "a/\351\273\204\351\235\231/0220 \346\226\207\344\273\266\346\265\201/homework3.js" "b/\351\273\204\351\235\231/0220 \346\226\207\344\273\266\346\265\201/homework3.js"
new file mode 100644
index 0000000000000000000000000000000000000000..ee0cf8a2ed8a0ee5267248e9eeed7ddb6b5220b7
--- /dev/null
+++ "b/\351\273\204\351\235\231/0220 \346\226\207\344\273\266\346\265\201/homework3.js"	
@@ -0,0 +1,46 @@
+//
+let fs = require("fs");
+function big() {
+    let str = "asdfghjklqwr";
+    let fd = fs.openSync("./txet.txt", "w");//创建一个文本
+    for (let i = 0; i < 1000; i++) {
+        let starat = Math.floor(Math.random() * (str.length));//截取的第一个下标数字
+        let end = Math.floor(Math.random() * (str.length));//截取的最后一个下标数字
+        if (starat > end) {
+            //排序 从小到大 例如7 5
+            let tem = starat;
+            starat = end;
+            end = tem;
+        };
+        if (starat == end) continue;
+        //用temer 等于 把str的字符串分割 开头数字到结尾数字
+        let temer = str.slice(starat, end);
+        //再fd文本里填写内容
+        fs.writeSync(fd, temer);
+    }
+    //关闭文本
+    fs.closeSync(fd);
+}
+big();
+
+// 用read接收 创建读取文本
+let read = fs.createReadStream("./txet.txt");
+let array = [];
+//on 后面的date代表读取数据 text自己设置代表文本
+read.on("data", (text) => {
+    // 把文本转为字符串
+    let str = text.toString();
+    for (let i = 0; i < str.length; i++) {
+        //如果截取到的内容没出现过就存起来 出现过就再加一次
+        if(array[str[i]]==undefined){
+            array[str[i]]=1;
+        }else{
+            array[str[i]]+=1;
+        }
+        
+    }
+});
+
+read.on("end",()=>{
+    console.log(array);
+})
diff --git "a/\351\273\204\351\235\231/\346\250\241\345\235\227/.keep" "b/\351\273\204\351\235\231/\346\250\241\345\235\227/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\351\273\204\351\235\231/\346\250\241\345\235\227/moban.js" "b/\351\273\204\351\235\231/\346\250\241\345\235\227/moban.js"
new file mode 100644
index 0000000000000000000000000000000000000000..1c4cf0e3f93faa5c385d0a0fd7965b9f1a61ab17
--- /dev/null
+++ "b/\351\273\204\351\235\231/\346\250\241\345\235\227/moban.js"
@@ -0,0 +1,31 @@
+let obj={
+    add:function(num1,num2){
+        return num1+num2;
+    },
+    sub:function(num1,num2){
+        return num1-num2;
+    },
+    mul:function(num1,num2){
+        return num1*num2;
+    },
+    div:function(num1,num2){
+        return num1/num2;
+    },
+    suan:function(num1,num2,symbal){
+        if(!Number(num1)){
+            console.log("num1必须要为数字");
+            return false;
+        }
+        if(!Number(num2)&&(num2)!=0){
+            console.log("num2必须要为数字");
+            return false;
+        }
+        if(symbal=="div"){
+            if(!Number(num2)==0){
+                console.log("被除数不能为零")
+            }
+        }
+        return this [symbal] (num1,num2);
+    }
+};
+module.exports=obj;
\ No newline at end of file
diff --git "a/\351\273\204\351\235\231/\346\250\241\345\235\227/text.js" "b/\351\273\204\351\235\231/\346\250\241\345\235\227/text.js"
new file mode 100644
index 0000000000000000000000000000000000000000..21c638cfae71cf0ea49c859d17671c2cc68a637f
--- /dev/null
+++ "b/\351\273\204\351\235\231/\346\250\241\345\235\227/text.js"
@@ -0,0 +1,2 @@
+let sul=require("./moban.js");
+console.log(sul.suan(2,3,"add"));
\ No newline at end of file
diff --git "a/\351\273\204\351\235\231/\351\273\204\351\235\231.txt" "b/\351\273\204\351\235\231/\351\273\204\351\235\231.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391