关于javascript:JavaScript作用域函数作用域全局变量污染命名空间

在C#中咱们都基本上不讲作用域，因为一切都是自然而然的（用语言形容反而有些艰难）。但JavaScript的作用域，让人十分头大！

局部变量
如果一个变量在函数体外部（用var）申明，则该变量的作用域为整个函数体，在函数体外不可援用该变量。（另见：let）

不同函数外部的同名变量相互独立，互不影响。

这样被申明的变量被称之为：局部变量。

function scope() {

var sname = '李志博';console.log('in function:' + sname);

}
scope();
console.log('out function:' + sname);

全局变量“净化”
不在任何函数内定义的变量具备全局作用域，被称之为全局变量。

演示：

如果script只是在HTML页面中应用，全局变量还能够承受（而且比拟不便）；

但随着JavaScript规模扩充，一个我的项目可能援用多个（第三方/其他人写的）类库（js文件），各个文件间的名称抵触就越来越难以避免，给开发/保护带来极大的问题！这就被称之为“全局变量净化”。

词法作用域

察看以下代码：

    var sname = "飞哥";    function smart() {              alert(`${sname}最帅`);    }    function reallySmart() {        var sname = '子祥';           smart();    }    reallySmart();

reallySmart()调用smart()，smart()中须要sname但又没有申明sname，怎么办？

应用reallySmart()中定义的'子祥'，还是
全局变量"飞哥"
由var申明的变量的作用范畴，其作用域由是由其源代码的书写地位,（而不是在哪里执行）决定的。

JavaScript的函数中不仅能够应用全局变量，还能够应用该函数内部的函数所申明的变量：

    function outFunc(sname) {        var age = 100;        function innerFunc() {            alert(age);   //age定义在innerFunc()之外        }        innerFunc();    }

这样就造成了一个作用域链：JavaScript会沿着这个链条由外向外查找，直到undefined。

@想一想@：如何剪切/粘贴第一个函数，能力显示：子祥最帅？

名称空间（namespace）
其余成熟的工程化语言内置了名称空间（namespace）来解决这个问题，比方：

//尽管都是“源栈”，但他们显然是不一样的：
China.Chongqing.Luckystack
China.Bejin.Luckystack
US.NewYork.Luckstack
JavaScript只能模仿：

先定义一个惟一的全局变量（对象）
其余变量都写出是上述全局变量的成员（属性和办法）
还能够多层嵌套，最初造成名称空间一样的“款式”
var China = {};
China.Chongqing = {};
China.Chongqing.LuckyStack = {};
China.Chongqing.LuckyStack.wpz = function () {
JQuery等类库就是这样做的。（演示）

strict模式（ES5）
把咱们之前的代码稍作改变：

function scope() {

/*var*/ sname = '李志博';   //正文掉var@猜一猜@：会有什么后果？

如果在JavaScript的函数中申明变量，不应用var，该变量就具备全局作用域！——个性超级坑爹的一个“个性（bug）”，尤其是在代码review的时候，你基本不晓得这是在：

应用一个已申明的变量，还是
要申明一个全局变量
所以从ES5开始，JavaScript就引入了所谓的“严格”模式，在代码顶部增加一行：

'use strict'; -- 如果浏览器不反对？
应用严格模式，就能强制JavaScript申明变量时必须应用：var；否则会报错。（以及其余束缚）

演示：调试窗口报错

官网举荐总是应用严格模式。然而，如果

a.js 文件上申明了'use strict'
b.js 文件没有申明'use strict'且没有依照严格模式书写代码

在html文件中先援用了a.js，而后再援用了 b.js
@想一想@：会呈现什么状况？

所以，更多时候，咱们不得不把'use strict'申明在函数顶部。

领会：JavaScript在解决大型项目，进行工程化开发方面先天不足！由此诞生了很多“奇巧淫技”，以及一直进化的ES规范。

但你认为这样就完结了？too young too simple啊！作为一个“先天严重不足，先天各种补丁”的语言，这所有才刚刚开始……

作业
应用“模仿名称空间”技术，构建一个函数函数yz.fei.get(number)；

yz.fei.get(number)除number以外，还能够承受任意多个回调函数做参数
这些回调函数能对number进行运算，并返回bool值的，比方has9()/has8()/has6()
get()函数顺次运行它的回调函数，只有回调函数运行后果为真，就累加计数
最初返回累加值
让yz.fei.get(number)调用has9()/has8()/has6()，实现之前“统计含9/8/6数字个数”的作https://github.com/hdfgfgh546...
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