Master js functions

This article mainly shares with you the detailed explanation of js functions. It mainly shares with you three methods of function definition and function calling methods. I hope it can help you.

Definition of js function:

Function keyword: function;

Function definition is composed of, keyword, function name plus a set of parameters, and placed in curly brackets Defined by a piece of code that needs to be executed.

Function name: required. Function names must be unique within the same page and are case-sensitive.

Parameters: optional. Used to specify a parameter list.

Function statement body: required. Statements that implement function functions.

Expression: Optional, used to return function expression.

function 函数名([参数1,参数2，]){
函数语句体;
   [ return 表达式;]
}

Function definition method;

方法一
var fun1=new Function('{alert("html")}');

方法二
var fun2=function(){
    alert("css");
}

方法三
function fun3(){
    alert("javascript");
}

Function call:

函数调用；
需要先定义再调用；
<script type="text/javascript">
    function test(str1,str,){
       alert(str1+str2);
   }
   
test();

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