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fengchuanyu 20 horas atrás
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3 arquivos alterados com 101 adições e 0 exclusões
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  1. 38 0
      3_JavaScript/练习题17_斐波那契数列.html
  2. 27 0
      3_JavaScript/练习题18_pi的近似值.html
  3. 36 0
      3_JavaScript/练习题19_获胜率.html

+ 38 - 0
3_JavaScript/练习题17_斐波那契数列.html
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+<!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>
 
+    <script>
 
+        // 非递归实现斐波那契数列
 
+        // 1 1 2 3 5 8...
 
+        // function Fibonacci(n) {
 
+        //     if(n<3){
 
+        //         return 1;
 
+        //     }else{
 
+        //         var arr = [1,1];
 
+        //         for(var i=0;i<n;i++){
 
+        //             arr[i+2] = arr[i]+arr[i+1];
 
+        //         }
 
+        //         return arr[n-1];
 
+        //     }
 
+        // }
 
+        // console.log(Fibonacci(6));
 
+
 
+        // 递归实现斐波那契数列
 
+        // function Fibonacci(n) {
 
+        //     if(n<3){
 
+        //         return 1;
 
+        //     }else{
 
+        //         return Fibonacci(n-1)+Fibonacci(n-2);
 
+        //     }
 
+        // }
 
+
 
+        // console.log(Fibonacci(5));
 
+
 
+    </script>
 
+</body>
 
+</html>

+ 27 - 0
3_JavaScript/练习题18_pi的近似值.html
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@@ -0,0 +1,27 @@
 
+<!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>
 
+    <script>
 
+        // 计算pi的近似值
 
+        function Pi(n){
 
+            var sum = 0;
 
+            // Math.pow(-1,n-1)*(1/(2*n-1))
 
+            for(var i=1;i<=n;i++){
 
+                sum += Math.pow(-1,i-1)*(1/(2*i-1));
 
+            }
 
+            return sum*4;
 
+        }
 
+        console.log(Pi(100));
 
+        console.log(Pi(500));
 
+        console.log(Pi(1000));
 
+        console.log(Pi(10000));
 
+
 
+
 
+    </script>
 
+</body>
 
+</html>

+ 36 - 0
3_JavaScript/练习题19_获胜率.html
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+<!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>
 
+    <script>
 
+        // 计算获胜率
 
+        function WinRate(n){
 
+            // 生成1-9之间的随机数
 
+           var num1 = Math.floor(Math.random()*9)+1;
 
+           var num2 = Math.floor(Math.random()*9)+1;
 
+           var num3 = Math.floor(Math.random()*9)+1;
 
+           console.log(num1,num2,num3);
 
+           if(num1 == 8 || num2 == 8 || num3 == 8) {
 
+             return true;
 
+           }else{
 
+             return false;
 
+           }
 
+        }
 
+        
+        var winCount = 0;
 
+        var playCount = 10;
 
+        for(var i = 0;i<playCount;i++){
 
+            // 每次游戏都调用WinRate函数
 
+            if(WinRate()){
 
+                winCount++;
 
+            }
 
+        }
 
+        console.log((winCount/playCount)*100 + "%");
 
+
 
+    </script>
 
+</body>
 
+</html>