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fix:day8

e 1 ano atrás
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adfa8b0574
commit
55b6e76b6b
4 arquivos alterados com 162 adições e 0 exclusões
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  1. 74 0
      day8/html/10.条件语句.html
  2. 46 0
      day8/html/11.小例子.html
  3. 25 0
      day8/html/12.小例子.html
  4. 17 0
      day8/html/9.语句.html

+ 74 - 0
day8/html/10.条件语句.html
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@@ -0,0 +1,74 @@
 
+<!DOCTYPE html>
 
+<html lang="en">
 
+<head>
 
+    <meta charset="UTF-8">
 
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
+    <title>条件语句</title>
 
+</head>
 
+<body>
 
+    <!-- 
+        1.if条件语句
 
+        if 搭配 else使用
 
+        if(执行的表达式) {
 
+           满足该条件时 执行的语句
 
+        } else if（执行的表达式）{
 
+           满足该条件时 执行的语句
 
+        } else {
 
+            不满足条件时 执行的语句
 
+        }
 
+        2.switch(条件语句){
 
+            case 值：
 
+                表达式；
 
+                break;
 
+            case 值：
 
+                表达式；
 
+                break;
 
+                ....
 
+            default:
 
+                默认表达式；
 
+                break；(跳出该循环)
 
+        }
 
+     -->
 
+    <script>
 
+        // 条件语句：去执行表达式的判断，判断是否执行语句还是跳过该语句
 
+        var a = 'hahaha';
 
+        if(a > 18) {
 
+            console.log("年纪大于18岁")
 
+        } else if(a == 18) {
 
+            console.log("年级等于18岁")
 
+        } else if(a < 18){
 
+            console.log("年级小于18岁")
 
+        } else {
 
+            console.log("输入非数字")
 
+        }
 
+
 
+        var b = 3;
 
+        if ( b < 5 ) {
 
+            console.log("b<5")
 
+        };
 
+
 
+
 
+        var c = 67;
 
+        switch(c){
 
+            case 45:
 
+            case 60:
 
+            case 65:
 
+            case 61:
 
+            case 62:
 
+            case 63:
 
+            case 64:
 
+            case 66:
 
+            case 67:
 
+                console.log("c存在");
 
+                break;
 
+            default:
 
+                console.log("其他值");
 
+                break;
 
+        }
 
+
 
+
 
+
 
+
 
+    </script>
 
+</body>
 
+</html>

+ 46 - 0
day8/html/11.小例子.html
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@@ -0,0 +1,46 @@
 
+<!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>
 
+        // alert("内容")//警告框
 
+        // prompt("请输入")//提示框
 
+        // confirm("好的") //确认框
 
+        // window.prompt("请输入年级",18)
 
+        // prompt（"提示信息"，默认输入框中的值）
 
+        var month = prompt("请输入月份");
 
+        var a = 3; //number
 
+        var b = '3'; //string
 
+        console.log(month,'mouth')
 
+        console.log(a,'a')
 
+        console.log(b,'b')
 
+        switch(month) {
 
+            case "1":
 
+            case "3":
 
+            case "5":
 
+            case "7":
 
+            case "8":
 
+            case "10":
 
+            case "12":
 
+                alert("当前是31天");
 
+                break;
 
+            case "4":
 
+            case "6":
 
+            case "9":
 
+            case "11":
 
+                alert("当前是30天");
 
+                break;
 
+            case "2":
 
+                alert("当前是2月");
 
+                break;
 
+            default:
 
+                alert("输入内容不是数字");
 
+                break;  
+        }
 
+    </script>
 
+</body>
 
+</html>

+ 25 - 0
day8/html/12.小例子.html
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@@ -0,0 +1,25 @@
 
+<!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 year = prompt("请输入年份");
 
+       console.log(year)
 
+
 
+     // 除以4 为0 
+     // 除以100  余数！=0
 
+     
+    if(year % 4 == 0 && year % 100 != 0) {
 
+        alert("当前为闰年");
 
+    } else {
 
+        alert("当前为平年");
 
+    }
 
+
 
+
 
+    </script>
 
+</body>
 
+</html>

+ 17 - 0
day8/html/9.语句.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>
 
+    <!-- 语句：由表达式和运算符组成 -->
 
+    <script>
 
+    //    null []array {}object
 
+    {
 
+        // 代码块
 
+    }
 
+    </script>
 
+</body>
 
+</html>