javascript——基础预热与语法

刺骨的言语ヽ痛彻心扉 2021-07-25 23:29 361阅读 0赞

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QQ 1285575001  
Wechat M010527  
技术交流 QQ群599020441  
纪年科技aming

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### 基础知识 ###

html css 布局 + js 互动 三剑客  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 1]  
功能 性能 语言解释形式

sun 网景 公司

SE java 应用  
ME 嵌入式  
EE B/S

applet 响应程序 同 js  
需要虚拟机 解析 applet（微软 矛盾）

OA办公系统 （网管运营）

js弱类型 基于对象  
java强类型 面向对象  
php 解释型 -->服务器端 php应用程序 —apache 模块  
先下载 浏览器解析 脚本 无生命周期

js语言 原生  
Dom + Bom ----> jquery

浏览器种类 兼容性

js运行  
输入输出  
html -->内联 外联 嵌入式 输入式 css -->js  
如何使用js

变量  
数据类型  
运算符 表达式  
流程控制  
函数  
对象（封装 继承 多态）  
内置js对象 时间 数学 字符串 数组对象 （pdo mysql ）  
数组

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### js 如何运行 ###

html 嵌入程序 js JScript（同一标准） VBScript applet

### 页面适用js 及输出 ###

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*  默认 js脚本  
    ![在这里插入图片描述][20200116222802709.png]![在这里插入图片描述][20200116222939618.png]
 *  访问机制 出错 停止运行
 *  web服务器访问 ≠ 直接打开浏览器解析访问  
    ![在这里插入图片描述][20200116223730220.png]  
    ![在这里插入图片描述][20200116223735116.png]![在这里插入图片描述][20200116223840769.png]
 *  错误调试  
    注释调试法  
    输出调试法

弹出 输出  
![在这里插入图片描述][20200116225916427.png]  
![在这里插入图片描述][20200116225930451.png]

*  可多个 什么类型都可以  
    ![在这里插入图片描述][20200116230215994.png]  
    ![在这里插入图片描述][20200116230503171.png]
 *  字符串
 *  文档里任何地方都可以 （不在嵌套里）  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 3]
 *  从上到下 关联 （与php一样）（不要重名）  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 4]  
    js 提取（规范好看）

php可以在html嵌套结构中写

![在这里插入图片描述][20200116232501594.png]

*  js 不可以  
    ![在这里插入图片描述][20200116232420645.png]  
    ![在这里插入图片描述][20200116232530130.png]
 *  可读性 调用  
    ![在这里插入图片描述][20200116232636115.png]
 *  运行时机 不同  
    ![在这里插入图片描述][20200116232723397.png]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 5]![在这里插入图片描述][20200116232746842.png]  
    ![在这里插入图片描述][20200116232836834.png]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 6]
 *  html标签 添加事件  
    ![在这里插入图片描述][2020011623313321.png]
    
     *  公用代码  
        独立js文件  
        ![在这里插入图片描述][20200116233755836.png]  
        ![在这里插入图片描述][20200116233904437.png]
 *  多个文件 关系：关联
 *  ck编辑器
 *  开源插件  
    js引入
 *  关联 重复

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![在这里插入图片描述][20200202193530419.png]![在这里插入图片描述][20200202193549879.png]![在这里插入图片描述][2020020220592525.png]![在这里插入图片描述][20200202210917278.png]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 9]![在这里插入图片描述][20200202211012295.png]![在这里插入图片描述][20200202211800533.png]![在这里插入图片描述][20200202211815451.png]![在这里插入图片描述][20200202212242118.png]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 10]

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![在这里插入图片描述][20200202215504356.png]  
![在这里插入图片描述][2020020222063124.png]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 13]

*  css js 功能 有重叠地方 注意搭配 代码优化 简洁  
    ![在这里插入图片描述][20200202221044711.png]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 14]![在这里插入图片描述][20200202221142863.png]![在这里插入图片描述][20200202221150905.png]![在这里插入图片描述][20200202221549306.png]

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![在这里插入图片描述][20200203071943854.png]

*  可以优化 匿名函数  
    ![在这里插入图片描述][20200203072121287.png]  
    ![在这里插入图片描述][20200203072323290.png]
 *  从头读到尾 所以用onload 加载完 脚本

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 15]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 16]![在这里插入图片描述][20200203073501308.png]![在这里插入图片描述][20200203073222244.png]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 17]  
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*  顺序执行 规则  
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    ![在这里插入图片描述][20200203114624887.png]  
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    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 25]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 26]![在这里插入图片描述][20200203115518106.png]  
    ![在这里插入图片描述][20200203115732893.png]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 27]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 28]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 29]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjA4MDAw_size_16_color_FFFFFF_t_70 30]

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