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fengchuanyu 15 horas atrás
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4 arquivos alterados com 87 adições e 0 exclusões
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  1. 22 0
      3_JavaScript/26_判断是否为数字.html
  2. 33 0
      3_JavaScript/练习22_获取当前时间.html
  3. 17 0
      3_JavaScript/练习题20_内置Math方法.html
  4. 15 0
      3_JavaScript/练习题21_0-100的随机数字.html

+ 22 - 0
3_JavaScript/26_判断是否为数字.html
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@@ -0,0 +1,22 @@
 
+<!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>
 
+        // 判断是否为数字
 
+        var str = "a" * 1
 
+        console.log(str);
 
+        console.log(isNaN(str));
 
+
 
+        // 判断是否为数字
 
+        var str = "3"
 
+        if(str >= "0" && str <= "9"){
 
+            console.log("是数字");
 
+        }
 
+    </script>
 
+</body>
 
+</html>

+ 33 - 0
3_JavaScript/练习22_获取当前时间.html
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@@ -0,0 +1,33 @@
 
+<!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>
 
+        // 获取当前时间
 
+        var date = new Date();
 
+        // 年
 
+        var year = date.getFullYear();
 
+        // 月
 
+        var month = date.getMonth()+1;
 
+        // 日
 
+        var day = date.getDate();
 
+
 
+        // 小时
 
+        var hour = date.getHours();
 
+        // 分钟
 
+        var minute = date.getMinutes();
 
+        // 秒
 
+        var second = date.getSeconds();
 
+
 
+        // 获取星期
 
+        var week = date.getDay() == 0 ? "日" :date.getDay() ;
 
+
 
+        console.log(year+"年"+month+"月"+day+"日"+hour+"时"+minute+"分"+second+"秒"+"星期："+week);
 
+
 
+    </script>
 
+</body>
 
+</html>

+ 17 - 0
3_JavaScript/练习题20_内置Math方法.html
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@@ -0,0 +1,17 @@
 
+<!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 = prompt("请输入一个数字");
 
+        num *= 1;
 
+        console.log("当前数字的平方为"+Math.pow(num,2));
 
+        console.log("当前数字的平方根为"+Math.sqrt(num));
 
+        console.log("当前数字的自然对数为"+Math.log(num));
 
+    </script>
 
+</body>
 
+</html>

+ 15 - 0
3_JavaScript/练习题21_0-100的随机数字.html
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@@ -0,0 +1,15 @@
 
+<!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>
 
+        // 生成0-100的随机数字
 
+        var num = Math.floor(Math.random()*101);
 
+        console.log(num);
 
+    </script>
 
+</body>
 
+</html>