diff --git a/zye.js b/zye.js
new file mode 100644
index 0000000000000000000000000000000000000000..65188e27ab164def8ed3a4eb5efb8b4a5849aed6
--- /dev/null
+++ b/zye.js
@@ -0,0 +1,21 @@
+let fs = require("fs");
+
+for(let i=0;i<1000;i++){
+    let kais =Date.now();
+    let fileName ="./ "+ i+".txt"
+    fs.writeFileSync(fileName,kais+"");
+    
+};
+
+let kais =parseFloat(fs.readFileSync("./ 0.txt").toString());
+
+console.log(kais);
+
+let jies =fs.readFileSync("./ 999.txt").toString();
+console.log(jies);
+console.log(jies-kais);
+
+
+
+
+//异步
\ No newline at end of file
diff --git "a/\350\256\241\347\256\227\345\231\250/gongneng.js" "b/\350\256\241\347\256\227\345\231\250/gongneng.js"
new file mode 100644
index 0000000000000000000000000000000000000000..5468b6efd296429b5524f7926030c01e26c7306b
--- /dev/null
+++ "b/\350\256\241\347\256\227\345\231\250/gongneng.js"
@@ -0,0 +1,60 @@
+//parseFloat 将字符串转译为数字
+let obj = {
+    fuhao: function (a, fu, b) {
+        a = parseFloat(a);
+        b = parseFloat(b);
+        let pan = true;
+        
+        if (!/^[0-9]*$/.test(a) || !/^[0-9]*$/.test(b)) {
+            console.log("请不要输入除数字以外的任何字符串");
+            pan = false;
+        }
+        if (a == NaN || b == NaN) {
+            console.log("请不要为空");
+            pan = false;
+        }
+        if (pan) {
+            switch (fu) {
+                case "+":
+                    return a + b;
+                    break;
+
+
+
+                case "-":
+                    return a - b;
+                    break;
+
+
+
+
+                case "*":
+                    return a * b;
+                    break;
+
+
+
+
+
+                case "/":
+                    if (b == 0) {
+                        return console.log("除数不能为0");
+                        break;
+                    } else {
+                        return a / b;
+                    }
+
+
+
+
+                case "%":
+                    return a % b;
+                    break;
+            }
+        }
+
+    }
+
+}
+
+module.exports = obj;
\ No newline at end of file
diff --git "a/\350\256\241\347\256\227\345\231\250/use.js" "b/\350\256\241\347\256\227\345\231\250/use.js"
new file mode 100644
index 0000000000000000000000000000000000000000..58dd492139b13df90c1b0b9ecf02645f4a2c81af
--- /dev/null
+++ "b/\350\256\241\347\256\227\345\231\250/use.js"
@@ -0,0 +1,3 @@
+let jisuan = require('./gongneng.js');
+
+console.log(jisuan.fuhao(2,"/",0));