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fengchuanyu 1 week ago
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476cb64edd
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cfc25dbdb3
4 changed files with 110 additions and 0 deletions
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  1. 44 0
      3_JavaScript/22_数组循环.html
  2. 19 0
      3_JavaScript/练习21_开根号、开平方、自然对数.html
  3. 15 0
      3_JavaScript/练习22_0-100随机数字.html
  4. 32 0
      3_JavaScript/练习23_获取当前时间.html

+ 44 - 0
3_JavaScript/22_数组循环.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>
 
+        var arr = [1,2,3,4,5,6,7,8,9]
 
+
 
+        // forEach 是数组下的循环(遍历)方法
 
+        // 参数部分为函数。函数内部两个参数 第一个参数数组遍历过程中的值 第二个每个值的索引（选填项）
 
+        // arr.forEach(function(item,index){
 
+        //     console.log(item,index)
 
+        // })
 
+
 
+        // var arr2 = ["a","b",1,2,3];
 
+        // 数组过滤 filter
 
+        // filter 每次遍历的过程中如果遇到rentu 的值为 true 会把当前遍历的值返回
 
+        // var arr3 = arr2.filter(function(item,index){
 
+        //     // console.log(item,index);
 
+        //     if(item>=0 && item<=9){
 
+        //         return true;
 
+        //     }else{
 
+        //         return false;
 
+        //     }
 
+        // })
 
+
 
+        //  var arr3 = arr2.filter(function(item,index){
 
+        //    return (item>=0 && item<=9);
 
+        // })
 
+        // console.log(arr3)
 
+
 
+        var arr4 = [1,2,3,4,5,6,7,8,9];
 
+        // map通过指定函数处理数组的每个元素，并返回处理后的数组。
 
+        // return 什么值那么数组中就是什么
 
+        var arr5 = arr4.map(function(item,index){
 
+            return item * 10;
 
+        })
 
+        console.log(arr5);
 
+    </script>
 
+</body>
 
+</html>

+ 19 - 0
3_JavaScript/练习21_开根号、开平方、自然对数.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>
 
+        var num = 25;
 
+        console.log(Math.pow(num,2));
 
+        console.log(Math.sqrt(num));
 
+        console.log(Math.log(num));
 
+        
+        
+
 
+    </script>
 
+</body>
 
+</html>

+ 15 - 0
3_JavaScript/练习22_0-100随机数字.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>
 
+        var num = Math.random();
 
+        num *= 101;
 
+        console.log(Math.floor(num));
 
+    </script>
 
+</body>
 
+</html>

+ 32 - 0
3_JavaScript/练习23_获取当前时间.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>
 
+        var now = new Date();
 
+        // 获取年份
 
+        var year = now.getFullYear();
 
+        // 获取月
 
+        var month = now.getMonth() + 1;
 
+        // 获取日期
 
+        var date = now.getDate();
 
+        // 获取小时
 
+        var hour = now.getHours();
 
+        // 获取分钟
 
+        var minute = now.getMinutes();
 
+        // 获取秒
 
+        var seconds = now.getSeconds();
 
+        //获取星期
 
+        var week = now.getDay();
 
+        week = week == 0?"日":week;
 
+
 
+        var str = year+"年"+month+"月"+date+"日"+hour+"点"+minute+"分"+seconds+"秒（星期"+week+"），欢迎您的到访！";
 
+        document.write(str);
 
+
 
+    </script>
 
+</body>
 
+</html>