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1

zsydgithub 2 years ago
parent
d2c4079a44
commit
0bdabaf319
3 changed files with 74 additions and 1 deletions
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  1. 15 1
      4_js/1.html
  2. 1 0
      4_js/1.js
  3. 58 0
      4_js/2_变量.html

+ 15 - 1
4_js/1.html
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@@ -1,12 +1,26 @@
 
 <!DOCTYPE html>
 
 <!DOCTYPE html>
 
 <html lang="en">
 
 <html lang="en">
 
+
 
 <head>
 
 <head>
 
   <meta charset="UTF-8">
 
   <meta charset="UTF-8">
 
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
 
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
   <title>Document</title>
 
   <title>Document</title>
 
 </head>
 
 </head>
 
+
 
 <body>
 
 <body>
 
-  
+  <div id="123">
 
+    123
 
+  </div>
 
+  <script>
 
+    // var div1 = document.getElementById('123')
 
+    // div1.onclick = function (){
 
+    //   console.log(123)
 
+    // }
 
+    // window.prompt('请输入年龄',18)
 
+    // document.write('<h2>hello  javascript</h2>')
 
+  </script>
 
+  <!-- <script src="1.js"></script> -->
 
 </body>
 
 </body>
 
+
 
 </html>
 
 </html>

+ 1 - 0
4_js/1.js
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@@ -0,0 +1 @@
 
+alert('我是js文件')

+ 58 - 0
4_js/2_变量.html
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@@ -0,0 +1,58 @@
 
+<!DOCTYPE html>
 
+<html lang="en">
 
+<head>
 
+  <meta charset="UTF-8">
 
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
 
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
+  <title>Document</title>
 
+</head>
 
+<body>
 
+  <script>
 
+    //在JavaScript中使用关键字var声明一个变量
 
+    
+
 
+    /* 
+    变量必须以字母开头
 
+    变量可以包含字母、数字、下划线_或者美元符号$
 
+    变量也能以 $ 和 _ 符号开头（不过我们不推荐这么做）
 
+    变量名称对大小写敏感（y 和 Y 是不同的变量）
 
+    变量名称不能为关键词
 
+    */
 
+
 
+    //创建
 
+    var a;
 
+    //赋值
 
+    a = 1;
 
+    console.log(a)
 
+    document.write(a)
 
+
 
+    var b = 123; //number
 
+    var B = 111;
 
+    console.log(b)
 
+    console.log(B)
 
+
 
+    var c = '我是小明。。。///！@#￥%%' //string
 
+    console.log(c)
 
+    var d = false;//boolean   只有两个值   true   false
 
+    console.log(d)
 
+
 
+    var D; //undefined
 
+    console.log(D)
 
+
 
+    // 基本数据类型  number  string  boolean  undefined
 
+    var a ='小明';
 
+    var b;
 
+    var c = 'hahahaha';
 
+    console.log(a,b,c) 
+
 
+
 
+    var f = '123'
 
+    console.log(f)
 
+    f = true
 
+    console.log(f)
 
+    f = 123
 
+    console.log(f)
 
+
 
+  </script>
 
+</body>
 
+</html>