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fengchuanyu 12 hours ago
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efee59e8c4
2 changed files with 83 additions and 0 deletions
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  1. 43 0
      3_JavaScript/练习题3_判断年龄.html
  2. 40 0
      3_JavaScript/练习题4_星期.html

+ 43 - 0
3_JavaScript/练习题3_判断年龄.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 age = prompt("请输入年龄");
 
+        // age = age*1;
 
+        // age *= 1;
 
+        age = parseInt(age);
 
+
 
+        if(age < 14){
 
+            console.log("儿童")
 
+            // 逻辑表达式多个条件不能一起写，如果想要表示多个条件 用 && ||符号进行连接
 
+        }else if(14<= age && age <24){
 
+        // }else if(age<24){
 
+            console.log("青少年");
 
+        }else if(24< age && age <40){
 
+            console.log("青年");
 
+        }else if(40<= age && age <60){
 
+            console.log("中年");
 
+        }else if(age>=60){
 
+            console.log("老年");
 
+        }else{
 
+            console.log("输入错误");
 
+        }
 
+
 
+
 
+        // 当比较运算符左右两侧都是字符串时， 按位比较（比较的是字符串的ASCII码值）
 
+        // if("12">"2"){
 
+        // 字符时按照排列数学比较
 
+        if("abc">"a"){
 
+            console.log("正确");
 
+        }else{
 
+            console.log("错误")
 
+        }
 
+
 
+    </script>
 
+</body>
 
+</html>

+ 40 - 0
3_JavaScript/练习题4_星期.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 week = prompt("请输入0-6的数字");
 
+        week = week * 1;
 
+        switch(week){
 
+            case 0:
 
+                console.log("星期日");
 
+                break;
 
+            case 1:
 
+                console.log("星期一");
 
+                break;
 
+            case 2:
 
+                console.log("星期二");
 
+                break;
 
+            case 3:
 
+                console.log("星期三");
 
+                break;
 
+            case 4:
 
+                console.log("星期四");
 
+                break;
 
+            case 5:
 
+                console.log("星期五");
 
+                break;
 
+            case 6:
 
+                console.log("星期六");
 
+                break;
 
+            default:
 
+                console.log("输入错误");
 
+                break;
 
+        }
 
+    </script>
 
+</body>
 
+</html>