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‎SUMMARY.md

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22

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* [封面](README.md)
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* [前言](index.md)
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* [01-JavaScrpit-基础知识](01/README.md)
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* [变量声明](01/bian-liang-sheng-ming.md)
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* [变量类型和计算](01/bian-liang-lei-xing-he-ji-suan.md)
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* [作用域](01/zuo-yong-yu.md)
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* [基本数据类型](01/shu-ju-lei-xing/README.md)
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* [Undefined](01/shu-ju-lei-xing/undefined.md)
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* [Null](01/shu-ju-lei-xing/null.md)
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* [Boolean](01/shu-ju-lei-xing/boolean.md)
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* [Number](01/shu-ju-lei-xing/number.md)
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* [String](01/shu-ju-lei-xing/string.md)
15-
* [Symbol](01/shu-ju-lei-xing/symbol.md)
16-
* [类型转换](01/lei-xing-zhuan-huan.md)
17-
* [02-JavaScrpit-引用类型](02/README.md)
18-
* [Object类型](02/objectlei-xing.md)
19-
* [Array类型](02/arraylei-xing/README.md)
20-
* [检测数组](02/arraylei-xing/jian-ce-shu-zu.md)
21-
* [转换方法](02/arraylei-xing/zhuan-huan-fang-fa.md)
22-
* [栈方法](02/arraylei-xing/zhan-fang-fa.md)
23-
* [队列方法](02/arraylei-xing/dui-lie-fang-fa.md)
24-
* [重排序方法](02/arraylei-xing/zhong-pai-xu-fang-fa.md)
25-
* [操作方法](02/arraylei-xing/cao-zuo-fang-fa.md)
26-
* [位置方法](02/arraylei-xing/wei-zhi-fang-fa.md)
27-
* [迭代方法](02/arraylei-xing/die-dai-fang-fa.md)
28-
* [归并方法](02/arraylei-xing/gui-bing-fang-fa.md)
29-
* [Date类型](02/datelei-xing.md)
30-
* [RexExp类型](02/rexexplei-xing.md)
31-
* [Function类型](02/functionlei-xing.md)
32-
* [Set类型\(ES6\)](02/setlei-578b28-es6.md)
33-
* [Map类型\(ES6\)](02/maplei-578b28-es6.md)
34-
* [03-JavaScrpit-面向对象程序设计](03/README.md)
35-
* [构造函数](03/gou-zao-han-shu.md)
36-
* [原型链](03/yuan-xing-lian.md)
37-
* [继承](03/ji-cheng.md)
38-
* [New](03/new.md)
39-
* [Object.create](03/object.create.md)
40-
* [04-JavaScrpit-函数表达式与函数式编程](04/README.md)
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* [递归](04/di-gui.md)
42-
* [闭包](04/bi-bao.md)
43-
* [this](04/this.md)
44-
* [箭头函数](04/jian-tou-han-shu.md)
45-
* [高阶函数](04/gao-jie-han-shu.md)
46-
* [由函数构建函数](04/you-han-shu-gou-jian-han-shu.md)
47-
* [纯度、不变性和更改政策](04/chun-du-3001-bu-bian-xing-he-geng-gai-zheng-ce.md)
48-
* [基于流的编程](04/ji-yu-liu-de-bian-cheng.md)
49-
* [无类编程](04/wu-lei-bian-cheng.md)
50-
* [函数基本应用](04/han-shu-ji-ben-ying-yong.md)
51-
* [05-JavaScrpit-BOM](05/README.md)
52-
* [window对象](05/windowdui-xiang.md)
53-
* [location对象](05/locationdui-xiang.md)
54-
* [navigator对象](05/navigatordui-xiang.md)
55-
* [screen对象](05/screendui-xiang.md)
56-
* [history对象](05/historydui-xiang.md)
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* [06-JavaScript-DOM](06/README.md)
58-
* [DOM节点操作](06/domjie-dian-cao-zuo.md)
59-
* [DOM结构操作](06/domjie-gou-cao-zuo.md)
60-
* [07-JavaScrpit-事件](07/README.md)
61-
* [事件流](07/shi-jian-liu.md)
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* [事件注册与触发](07/shi-jian-zhu-ce-yu-hong-fa.md)
63-
* [事件对象](07/shi-jian-dui-xiang.md)
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* [事件分类](07/shi-jian-fen-lei.md)
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* [08-JavaScrpit-算法应用](08/README.md)
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* [基本排序算法](08/ji-ben-pai-xu-suan-fa/README.md)
67-
* [冒泡排序](08/ji-ben-pai-xu-suan-fa/mao-pao-pai-xu.md)
68-
* [选择排序](08/ji-ben-pai-xu-suan-fa/xuan-ze-pai-xu.md)
69-
* [插入排序](08/ji-ben-pai-xu-suan-fa/cha-ru-pai-xu.md)
70-
* [希尔排序](08/ji-ben-pai-xu-suan-fa/xi-er-pai-xu.md)
71-
* [归并排序](08/ji-ben-pai-xu-suan-fa/gui-bing-pai-xu.md)
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* [快速排序](08/ji-ben-pai-xu-suan-fa/kuai-su-pai-xu.md)
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* [09-JavaScrpit-异步](09/README.md)
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* [Ajax](09/ajax.md)
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* [Promise](09/promise.md)
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* [10-JavaScrpit-跨域](10/README.md)
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* [跨域](10/kua-yu.md)
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* [跨域方法](10/kua-yu-fang-fa/README.md)
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* [Hash](10/kua-yu-fang-fa/hash.md)
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* [JSONP](10/kua-yu-fang-fa/jsonp.md)
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* [CORS](10/kua-yu-fang-fa/cors.md)
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* [XDomainRequest](10/kua-yu-fang-fa/xdomainrequest.md)
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* [11-JavaScrpit-模块化](11/README.md)
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* [AMD](11/amd.md)
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* [CommonJS](11/cmd.md)
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* [ES6模块化](11/es6mo-kuai-hua.md)
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* [12-JavaScrpit-Web安全🔐](12/README.md)
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* [XSS](12/xss.md)
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* [CSRF](12/csrf.md)
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* [13-JavaScrpit-应用](13/README.md)
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* [Socket.io库](13/socketio.md)
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* [async+await异步调用](13/async+awaityi-bu-diao-yong.md)
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* [axios](13/axios.md)
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* [14-JavaScript-设计模式](14.md)
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* [15-JavaScript-正则表达式](15.md)
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* [16-JavaScript-性能优化](16.md)
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* [17-JavaScript-错误监控](17.md)
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* [18-JavaScript-语法规则](18/README.md)
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* [ESlint](18/eslint.md)
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* [19-JavaScript-工具](19-javascriptgong-ju/README.md)
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* [时间操作](19-javascriptgong-ju/shi-jian-cao-zuo.md)
5+
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## 基础知识
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* [JavaScrpit-基础知识](ji-chu-zhi-shi/01/README.md)
9+
* [变量声明](ji-chu-zhi-shi/01/bian-liang-sheng-ming.md)
10+
* [变量类型和计算](ji-chu-zhi-shi/01/bian-liang-lei-xing-he-ji-suan.md)
11+
* [作用域](ji-chu-zhi-shi/01/zuo-yong-yu.md)
12+
* [基本数据类型](ji-chu-zhi-shi/01/shu-ju-lei-xing/README.md)
13+
* [Undefined](ji-chu-zhi-shi/01/shu-ju-lei-xing/undefined.md)
14+
* [Null](ji-chu-zhi-shi/01/shu-ju-lei-xing/null.md)
15+
* [Boolean](ji-chu-zhi-shi/01/shu-ju-lei-xing/boolean.md)
16+
* [Number](ji-chu-zhi-shi/01/shu-ju-lei-xing/number.md)
17+
* [String](ji-chu-zhi-shi/01/shu-ju-lei-xing/string.md)
18+
* [Symbol](ji-chu-zhi-shi/01/shu-ju-lei-xing/symbol.md)
19+
* [类型转换](ji-chu-zhi-shi/01/lei-xing-zhuan-huan.md)
20+
* [JavaScrpit-引用类型](ji-chu-zhi-shi/02/README.md)
21+
* [Object类型](ji-chu-zhi-shi/02/objectlei-xing.md)
22+
* [Array类型](ji-chu-zhi-shi/02/arraylei-xing/README.md)
23+
* [检测数组](ji-chu-zhi-shi/02/arraylei-xing/jian-ce-shu-zu.md)
24+
* [转换方法](ji-chu-zhi-shi/02/arraylei-xing/zhuan-huan-fang-fa.md)
25+
* [栈方法](ji-chu-zhi-shi/02/arraylei-xing/zhan-fang-fa.md)
26+
* [队列方法](ji-chu-zhi-shi/02/arraylei-xing/dui-lie-fang-fa.md)
27+
* [重排序方法](ji-chu-zhi-shi/02/arraylei-xing/zhong-pai-xu-fang-fa.md)
28+
* [操作方法](ji-chu-zhi-shi/02/arraylei-xing/cao-zuo-fang-fa.md)
29+
* [位置方法](ji-chu-zhi-shi/02/arraylei-xing/wei-zhi-fang-fa.md)
30+
* [迭代方法](ji-chu-zhi-shi/02/arraylei-xing/die-dai-fang-fa.md)
31+
* [归并方法](ji-chu-zhi-shi/02/arraylei-xing/gui-bing-fang-fa.md)
32+
* [Date类型](ji-chu-zhi-shi/02/datelei-xing.md)
33+
* [RexExp类型](ji-chu-zhi-shi/02/rexexplei-xing.md)
34+
* [Function类型](ji-chu-zhi-shi/02/functionlei-xing.md)
35+
* [Set类型\(ES6\)](ji-chu-zhi-shi/02/setlei-578b28-es6.md)
36+
* [Map类型\(ES6\)](ji-chu-zhi-shi/02/maplei-578b28-es6.md)
37+
* [JavaScrpit-BOM](ji-chu-zhi-shi/05/README.md)
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* [window对象](ji-chu-zhi-shi/05/windowdui-xiang.md)
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* [location对象](ji-chu-zhi-shi/05/locationdui-xiang.md)
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* [navigator对象](ji-chu-zhi-shi/05/navigatordui-xiang.md)
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* [screen对象](ji-chu-zhi-shi/05/screendui-xiang.md)
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* [history对象](ji-chu-zhi-shi/05/historydui-xiang.md)
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* [JavaScript-DOM](ji-chu-zhi-shi/06/README.md)
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* [DOM节点操作](ji-chu-zhi-shi/06/domjie-dian-cao-zuo.md)
45+
* [DOM结构操作](ji-chu-zhi-shi/06/domjie-gou-cao-zuo.md)
46+
* [JavaScrpit-事件](ji-chu-zhi-shi/07/README.md)
47+
* [事件流](ji-chu-zhi-shi/07/shi-jian-liu.md)
48+
* [事件注册与触发](ji-chu-zhi-shi/07/shi-jian-zhu-ce-yu-hong-fa.md)
49+
* [事件对象](ji-chu-zhi-shi/07/shi-jian-dui-xiang.md)
50+
* [事件分类](ji-chu-zhi-shi/07/shi-jian-fen-lei.md)
51+
* [JavaScrpit-异步](ji-chu-zhi-shi/09/README.md)
52+
* [Ajax](ji-chu-zhi-shi/09/ajax.md)
53+
* [Promise](ji-chu-zhi-shi/09/promise.md)
54+
* [JavaScript-正则表达式](ji-chu-zhi-shi/15.md)
55+
* [JavaScrpit-面向对象程序设计](ji-chu-zhi-shi/03/README.md)
56+
* [构造函数](ji-chu-zhi-shi/03/gou-zao-han-shu.md)
57+
* [原型链](ji-chu-zhi-shi/03/yuan-xing-lian.md)
58+
* [继承](ji-chu-zhi-shi/03/ji-cheng.md)
59+
* [New](ji-chu-zhi-shi/03/new.md)
60+
* [Object.create](ji-chu-zhi-shi/03/object.create.md)
61+
* [JavaScrpit-函数表达式与函数式编程](ji-chu-zhi-shi/04/README.md)
62+
* [递归](ji-chu-zhi-shi/04/di-gui.md)
63+
* [闭包](ji-chu-zhi-shi/04/bi-bao.md)
64+
* [this](ji-chu-zhi-shi/04/this.md)
65+
* [箭头函数](ji-chu-zhi-shi/04/jian-tou-han-shu.md)
66+
* [高阶函数](ji-chu-zhi-shi/04/gao-jie-han-shu.md)
67+
* [由函数构建函数](ji-chu-zhi-shi/04/you-han-shu-gou-jian-han-shu.md)
68+
* [纯度、不变性和更改政策](ji-chu-zhi-shi/04/chun-du-3001-bu-bian-xing-he-geng-gai-zheng-ce.md)
69+
* [基于流的编程](ji-chu-zhi-shi/04/ji-yu-liu-de-bian-cheng.md)
70+
* [无类编程](ji-chu-zhi-shi/04/wu-lei-bian-cheng.md)
71+
* [函数基本应用](ji-chu-zhi-shi/04/han-shu-ji-ben-ying-yong.md)
72+
* [JavaScript-语法规则](ji-chu-zhi-shi/18/README.md)
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* [ESlint](ji-chu-zhi-shi/18/eslint.md)
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## 进阶知识
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* [JavaScrpit-算法应用](jin-jie-zhi-shi/08/README.md)
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* [基本排序算法](jin-jie-zhi-shi/08/ji-ben-pai-xu-suan-fa/README.md)
79+
* [冒泡排序](jin-jie-zhi-shi/08/ji-ben-pai-xu-suan-fa/mao-pao-pai-xu.md)
80+
* [选择排序](jin-jie-zhi-shi/08/ji-ben-pai-xu-suan-fa/xuan-ze-pai-xu.md)
81+
* [插入排序](jin-jie-zhi-shi/08/ji-ben-pai-xu-suan-fa/cha-ru-pai-xu.md)
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* [希尔排序](jin-jie-zhi-shi/08/ji-ben-pai-xu-suan-fa/xi-er-pai-xu.md)
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* [归并排序](jin-jie-zhi-shi/08/ji-ben-pai-xu-suan-fa/gui-bing-pai-xu.md)
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* [快速排序](jin-jie-zhi-shi/08/ji-ben-pai-xu-suan-fa/kuai-su-pai-xu.md)
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* [JavaScrpit-模块化](jin-jie-zhi-shi/11/README.md)
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* [AMD](jin-jie-zhi-shi/11/amd.md)
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* [CommonJS](jin-jie-zhi-shi/11/cmd.md)
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* [ES6模块化](jin-jie-zhi-shi/11/es6mo-kuai-hua.md)
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* [JavaScrpit-应用](jin-jie-zhi-shi/13/README.md)
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* [Socket.io库](jin-jie-zhi-shi/13/socketio.md)
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* [async+await异步调用](jin-jie-zhi-shi/13/async+awaityi-bu-diao-yong.md)
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* [axios](jin-jie-zhi-shi/13/axios.md)
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* [JavaScript-设计模式](jin-jie-zhi-shi/14.md)
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* [JavaScript-性能优化](jin-jie-zhi-shi/16.md)
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* [JavaScript-工具](jin-jie-zhi-shi/19-javascriptgong-ju/README.md)
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* [时间操作](jin-jie-zhi-shi/19-javascriptgong-ju/shi-jian-cao-zuo.md)
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* [JavaScript-异常监控](jin-jie-zhi-shi/17.md)
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* [JavaScrpit-Web安全🔐](jin-jie-zhi-shi/12/README.md)
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* [XSS](jin-jie-zhi-shi/12/xss.md)
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* [CSRF](jin-jie-zhi-shi/12/csrf.md)
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* [JavaScrpit-跨域](jin-jie-zhi-shi/10/README.md)
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* [跨域](jin-jie-zhi-shi/10/kua-yu.md)
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* [跨域方法](jin-jie-zhi-shi/10/kua-yu-fang-fa/README.md)
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* [Hash](jin-jie-zhi-shi/10/kua-yu-fang-fa/hash.md)
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* [JSONP](jin-jie-zhi-shi/10/kua-yu-fang-fa/jsonp.md)
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* [CORS](jin-jie-zhi-shi/10/kua-yu-fang-fa/cors.md)
107+
* [XDomainRequest](jin-jie-zhi-shi/10/kua-yu-fang-fa/xdomainrequest.md)
102108

‎ji-chu-zhi-shi/01/README.md

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# JavaScrpit-基础知识
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![](../../.gitbook/assets/import2.png)
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![](../../.gitbook/assets/import.png)
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‎ji-chu-zhi-shi/01/bian-liang-lei-xing-he-ji-suan.md

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# 变量类型和计算
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## 变量类型和计算（1）
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* JS中使用typeof能得到的哪些类型
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* 何时使用`===`何时使用`==`
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* JS中有哪些内置函数
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* JS变量按照`存储方式`区分为哪些类型，并描述其特点
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* 如何理解`JSON`
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### 值类型
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* 从内存来说值类型是把每一个值存储在变量类型的每一个位置
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```javascript
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var a = 100;
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var b = a;
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a = 200
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console.log(b);//100
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```
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### 引用类型
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* 把a赋值\*-成一个对象，a的位置是通过指针指向一个位置
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* 把b赋值成a，其实是定义一个b，b的指针指向了那个对象位置
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* 也就是有两份`age：20`的对象
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* 对象的引用，就相当于复写一个对象，这两个对象之间相互独立
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* 引用类型：对象、数组、函数
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```javascript
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var a ={age:20};
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var b = a;
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b.age = 21;
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console.log(a.age); //21
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```
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* typeof运算符
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```javascript
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typeof undefined //undefined
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typeof 'abc' // String
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typeof 123 //number
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typeof true //boolean
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typeof {} //object
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typeof [] //object
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typeof null //object
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typeof console.log //funciton
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```
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### 变量计算-强制类型转换
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* 字符串拼接
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```javascript
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var a = 100 + 10;//110
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var b = 100 + '10';//10010
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```
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* == 运算符
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```javascript
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100 == '100' //true
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0 == '' //true
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null == undefined //true
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```
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* if语句
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```javascript
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var a = true;
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if(a){
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//....
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}
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var b = 100;
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if (b) {
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//....
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}
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var c = '';
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if (c) {
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//...
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}
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```
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* 逻辑运算
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```javascript
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console.log(10 && 0); //0
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console.log('' || 'abc'); //abc
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console.log(!window.acb); //true
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//判断一个变量会被当做true还是false
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var a = 100;
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console.log(!!a);//true
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```
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## 变量类型和计算（2）
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### JS中使用typeof能得到的类型
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```javascript
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//问题：JS中使用typeof能得到哪些类型
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typeof undefined //undefined
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typeof 'abc' // String
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typeof 123 //number
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typeof true //boolean
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typeof {} //object
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typeof [] //object
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typeof null //object
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typeof console.log //funciton
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```
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* 总结来说typeof可以得到
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`undefined、String、number、boolean`
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可以区分值类型，但对于引用类型无法很细的区分，只能区分函数。
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* 尤其是
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`typeof null object`
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它是一个引用类型
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### 何时使用===和==
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```javascript
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//问题：何时使用===何时使用==
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if (obj.a == null) {
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//这里相当于 obj.a === null || obj.a === undefined,简写形式
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//这是jquery源码中推荐的写法
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}
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```
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### JS中的内置函数
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```javascript
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//问题：JS中有哪些内置函数----数据封装类对象
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//作为构造函数的作用
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Object
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Array
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Boolean
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Number
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String
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Function
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Date
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RegExp
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Error
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```
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### JS按照存储方式区分变量类型
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```javascript
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//JS 变量按照存储方式区分为哪些类型，并描述其特点
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//值类型
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var a = 10;
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var b = a;
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a = 11;
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console.log(b); // 10
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//引用类型
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var obj1 = {x:100}
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var obj2 = obj1;
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obj1.x = 200;
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console.log(obj2.x); // 200
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```
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* ES中，引用类型是一种数据结构，用于将数据和功能组织在一起
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## 变量类型和计算（3）-理解JSON
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```javascript
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//问题：如何理解JSON
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//JSON只不过是一个JS对象
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//JSON也是一个数据格式
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JSON.stringify({a:10,b:20});
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JSON.parse('{"a":10."b":20}')
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```
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‎ji-chu-zhi-shi/01/bian-liang-sheng-ming.md

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# 变量声明
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