diff --git a/Introduction/img/hello.jpg b/Introduction/img/hello.jpg
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diff --git a/Introduction/img/images.png b/Introduction/img/images.png
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diff --git "a/Introduction/\345\200\213\344\272\272\344\273\213\347\264\271.html" "b/Introduction/\345\200\213\344\272\272\344\273\213\347\264\271.html"
deleted file mode 100644
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--- "a/Introduction/\345\200\213\344\272\272\344\273\213\347\264\271.html"
+++ /dev/null
@@ -1,31 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<style type="text/css">
-	a{
-		display: inline-block;
-		padding: 0px 5px;
-	}
-</style>
-	<title>個人介紹</title>
-</head>
-<body>
-<h1 style="color:cyan">HI!Welcom to my web</h1>
-<p style="color:red">個人介紹</p>
- <a href="file:///C:/Users/user/Documents/GitHub/HTML/Introduction/%E9%A6%96%E9%A0%81.html">首頁</a> 
- <a href="file:///C:/Users/user/Documents/GitHub/HTML/Introduction/%E5%80%8B%E4%BA%BA%E4%BB%8B%E7%B4%B9.html">個人介紹</a>
- <a href="file:///C:/Users/user/Documents/GitHub/HTML/Introduction/%E5%88%A5%E4%BA%BA%E5%B0%8D%E6%88%91%E8%AA%AA%E7%9A%84%E8%A9%B1.html">別人對我說的話</a>
-
- <br>
- <p style="color:orange">中文名字:侯尊堯</p>
- <br>
- <p style="color:orange">英文名字:Arnold</p>
- <br>
- <p style="color:orange">班級:四資管二</p>
- <br>
- <p style="color:orange">興趣:健身</p>
- <br>
-
-<h2 style="background-color:blue;color:white">呦齁齁齁齁</h2>
-</body>
-</html>
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diff --git "a/Introduction/\345\210\245\344\272\272\345\260\215\346\210\221\350\252\252\347\232\204\350\251\261.html" "b/Introduction/\345\210\245\344\272\272\345\260\215\346\210\221\350\252\252\347\232\204\350\251\261.html"
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--- "a/Introduction/\345\210\245\344\272\272\345\260\215\346\210\221\350\252\252\347\232\204\350\251\261.html"
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<style type="text/css">
-	a{
-		display: inline-block;
-		padding: 0px 5px;
-	}
-</style>
-	<title>別人對我說的話</title>
-</head>
-<body>
-<h1 style="color:cyan">HI!Welcom to my web</h1>
-<p style="color:red">別人對我說的話</p>
- <a href="file:///C:/Users/user/Documents/GitHub/HTML/Introduction/%E9%A6%96%E9%A0%81.html">首頁</a> 
- <a href="file:///C:/Users/user/Documents/GitHub/HTML/Introduction/%E5%80%8B%E4%BA%BA%E4%BB%8B%E7%B4%B9.html">個人介紹</a>
- <a href="file:///C:/Users/user/Documents/GitHub/HTML/Introduction/%E5%88%A5%E4%BA%BA%E5%B0%8D%E6%88%91%E8%AA%AA%E7%9A%84%E8%A9%B1.html">別人對我說的話</a>
- <br>
- <img src="C:\Users\user\Documents\GitHub\HTML\Introduction\img\images.png" alt="謝謝指教" style="width:200px;height:200px;">
- <br>
- <h2 style="background-color:blue;color:white">呦齁齁齁齁</h2>
-</body>
-</html>
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diff --git "a/Introduction/\351\246\226\351\240\201.html" "b/Introduction/\351\246\226\351\240\201.html"
deleted file mode 100644
index c5392a0..0000000
--- "a/Introduction/\351\246\226\351\240\201.html"
+++ /dev/null
@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<style type="text/css">
-	a{
-		display: inline-block;
-		padding: 0px 5px;
-	}
-</style>
-	<title>首頁</title>
-</head>
-<body>
-
-<h1 style="color:cyan">HI!Welcom to my web</h1>
-<p style="color:red">這是首頁</p>
- <a href="file:///C:/Users/user/Documents/GitHub/HTML/Introduction/%E9%A6%96%E9%A0%81.html">首頁</a> 
- <a href="file:///C:/Users/user/Documents/GitHub/HTML/Introduction/%E5%80%8B%E4%BA%BA%E4%BB%8B%E7%B4%B9.html">個人介紹</a>
- <a href="file:///C:/Users/user/Documents/GitHub/HTML/Introduction/%E5%88%A5%E4%BA%BA%E5%B0%8D%E6%88%91%E8%AA%AA%E7%9A%84%E8%A9%B1.html">別人對我說的話</a>
- <br>
-
- <img src="C:\Users\user\Documents\GitHub\HTML\Introduction\img\hello.jpg" alt="hello" style="width:200px;height:200px;">
- <br>
-<h2 style="background-color:blue;color:white">呦齁齁齁齁</h2>
-</body>
-</html>
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diff --git a/calculator.html b/calculator.html
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index 0000000..b6daa46
--- /dev/null
+++ b/calculator.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html>
+<head>
+	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+	<title>簡易計算機</title>
+</head>
+<body>
+	<h1>簡易計算機</h1>
+
+	<p>這個計算機可以計算加減乘除並印出結果</p>
+
+	
+	num1:<br>
+	<input type="number" id="num1">
+	<br>
+	operators(+.-.*./):<br>
+	<input type="text" id="operators">
+	<br>
+	num2:<br>
+	<input type="number" id="num2">
+	<br><br>
+	<input type="button" onclick="myFunction()" value="result">
+	<br><br>
+	
+
+
+	<p id="result"></p>
+
+	<script>
+	function myFunction() {
+    	var a,b,c
+    	a= document.getElementById("num1").value*1;
+    	b= document.getElementById("num2").value*1;
+    	c= document.getElementById("operators").value;
+    	
+    	if(c=='+'){
+    		document.getElementById("result").innerHTML = a+b;
+    	}
+    	if(c=='-'){
+    		document.getElementById("result").innerHTML = a-b;
+    	}
+    	if(c=='*'){
+    		document.getElementById("result").innerHTML = a*b;
+    	}
+    	if(c=='/'){
+    		document.getElementById("result").innerHTML = a/b;
+    	}
+    }
+
+    function clears() {
+    	document.getElementById("result").innerHTML='';
+    }
+    
+    </script>
+
+    <output id="result"></output>
+
+    <input type="button" onclick="clears()" value="clear">
+ 
+</body>
+</html>
\ No newline at end of file
diff --git a/grade determination.html b/grade determination.html
new file mode 100644
index 0000000..1fa0c79
--- /dev/null
+++ b/grade determination.html	
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+	<title>成績判斷</title>
+</head>
+<body>
+	<h1>輸入成績判斷及格與否</h1>
+
+	請輸入成績:<br>
+	<input type="number" id="grade">
+	<br><br>
+	<input type="button" onclick="deter()" id="deter" value="determine">
+	<br><br>
+
+	<script>
+		function deter(){
+			var a
+			a=document.getElementById("grade").value;
+
+			if(a>=60){
+				document.getElementById("result").innerHTML="及格"
+			}else{
+				document.getElementById("result").innerHTML="不及格";
+			}
+		}
+	</script>
+
+	<output id="result" ></output>
+
+
+</body>
+</html>
\ No newline at end of file
