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## ECMAScript
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### 基本语法
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##### 语句：
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`var num = 1;`
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##### 引入文件：
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1. 直接写
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2. 引入本地文件
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3. 引入网络来源
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##### 数据类型
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1. 数值
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2. 字符串
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3. 布尔
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4. null
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5. 对象
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6. undefined
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特别的 对象：
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```javascript
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var user{
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age: 18,
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name: 'sss',
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}
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```
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##### 运算符
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###### typeof
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`console.log(typeof age);`
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###### 三元/目运算符
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`num % 2 === 0 ? console.log("偶数") : console.log("奇数");`
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### 字符串
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#### json
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对象转为字符串
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JSON.stringify(obj)
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## BOM
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浏览器对象模型
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## DOM
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文档对象模型
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将html中所有元素都封装成一个对象，采用面向对象的方式，来对HTML进行操作
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## 事件监听
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