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## javascript 实现
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## javascript 实现
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![image-20201216143448329](/home/xbx/.config/Typora/typora-user-images/image-20201216143448329.png)
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![image-20201216143448329](1.javascript简介.assets/image-20201216143448329.png)
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- ecmascript
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- ecmascript
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- dom
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- dom
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### 关键字
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### 关键字
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![image-20201216153227720](/home/xbx/.config/Typora/typora-user-images/image-20201216153227720.png)
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### 保留字
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### 保留字
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![image-20201216153248328](/home/xbx/.config/Typora/typora-user-images/image-20201216153248328.png)
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# javascript简介
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## javascript 实现
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- ecmascript
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- dom
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- bom
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### ECMA
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- 语法
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- 类型
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- 语句
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- 关键字
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- 保留字
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- 操作符
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- 对象
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ECMA版本
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### DOM 文档对象模型
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是js操作html元素的接口
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- DOM 视图
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- DOM 事件
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- DOM 样式
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- DOM 遍历和范围
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### BOM 浏览器对象模型
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`针对于每个浏览器的实现`
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# 变量
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> javascript的变量是不区分类型的
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## 创建变量
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`var 变量名;`
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`var 变量名 = 变量值;`
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没有值的时候 是创建一个变量 但它的值是`undefined` 这也是默认变量的值 所有没有赋值的变量都是`undefined`
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赋值了之后就变成你赋值之后的值;
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> 实际演示 并且介绍console.log()
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## 变量类型
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