Home Web Front-end JS Tutorial Introduction to the use of JS basic functions

Introduction to the use of JS basic functions

Jun 04, 2018 pm 01:54 PM
javascript use Introduction

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*/
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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!

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