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@@ -0,0 +1,81 @@
+笔记
+
+  let 名 = 值  定义变量
+
+  const 名 = 值  定义变量
+
+   number 数字类型
+
+   NaN 表示不是数字类型
+
+   String 字符串 
+
+   infinity 无穷
+
+   boolean 布尔值
+
+   undefined 未定义
+
+   null 空
+
+```js
+<script>
+        let name,age,sex;
+        name = '留太僵';
+        age = 188;
+        sex = '女';
+        console.log(name,age,sex);
+
+        let name1 = 'coderwhy';
+        let admin;
+        admin = name1;
+        console.log(admin);
+
+        let num,num1,num2;
+        num = 1;
+        num1 = 2;
+         console.log(num,num1);
+        // num2 = num;
+        // num = num1;
+        // num1 = num2;
+        // console.log(num,num1);
+        num = num+num1;
+        num1 = num-num1;
+        num = num-num1
+        console.log(num,num1);
+    </script>
+
+    <!DOCTYPE html>
+    <html lang="en">
+    <head>
+        <meta charset="UTF-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
+        <title>Document</title>
+    </head>
+    <body>
+        <table border="1" cellspacing="0" align="center" width="50%"><caption><h1>十月生活费</h1></caption>
+            <tr>
+                <th>银行卡余额</th>           
+                <th>水费</th>
+                <th>电费</th>
+                <th>网费</th>
+                <th>余额</th>
+            </tr>
+            <script>
+                let money = prompt("请输入您的余额")
+                let shuifei = prompt("请输入水费")
+                let dianfei = prompt("请输入电费")
+                let wangfei = prompt("请输入网费")
+                let yue = money-shuifei-dianfei-wangfei
+            </script>
+            <tr align="center">
+              <td><script>document.write(money)</script></td>
+              <td><script>document.write(shuifei)</script></td>
+              <td><script>document.write(dianfei)</script></td>
+              <td><script>document.write(wangfei)</script></td>
+              <td><script>document.write(yue)</script></td>
+            </tr>
+        </table>
+    </body>
+    </html>
+```
