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HomeWeb Front-endJS TutorialIntroduction to the use of JS basic functions

Introduction to the use of JS basic functions

Jun 04, 2018 pm 01:54 PM
javascriptuseIntroduction

This time I will bring you an introduction to the use of JS basic functions. What are the precautions for using JS basic functions? The following is a practical case, let’s take a look.

/** 函数*  - 函数也是一个对象*  - 函数中可以分钟一些功能(功能),在需要时可以执行这些功能(代码)*  - 函数中可以保存一些代码在需要的时候调用*  - 使用typeof检查一个函数对象时,会返回一个function** 函数有三种创建方式,第一种是用 new来创建函数,第二种是function加函数名()创建,第三种是匿名函数;* 下面来分别讲一下使用:*///我们在实际在开发中很少使用构造函数来创建一个函数对象//创建一个函数对象。这种写法不好,建议不要使用//第一种创建方式
       //var fun = new Function('console.log("Hello 这是我的第一个函数");');        //封装到函数中的代码不会立即执行        //函数中的代码会在函数调用的时候执行        //调用函数 语法: 函数对象()        //当调用函数时,函数中封装的代码会按照顺序执行        //console.log(fun);        //调用函数        //fun();
//第二种创建方式/** 使用函数声明来创建一个函数*  语法:*      function 函数名(形参1,形参2,...){*          语句...*      }*/
       function fun2(){            console.log('这是我第二个函数');        }                //调用fun2        fun2();、
/** 使用函数白大师来创建一个函数* var 函数名 = function(形参1,形参2,...){*      语句...* }*///第三种创建方式
       var fun3 = function(){             console.log('我是匿名函数中封装的代码');        };        fun3();
/** fun3和fun2的写法没有什么太大的区别,在有需求的情况下可以使用fun3,一般情况下会使用fun2的写法* 这个写法易懂、代码少* fun3是属于赋值形式的函数,所以在大括号结束后面一定加上一个分号*/

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

Detailed explanation of the use of click, touch, and tap events in mobile WEB development

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How to operate the page, visual area, screen and other width and height attributes

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