How to declare functions in JavaScript

How to declare functions in JavaScript: Use new to declare functions, such as [varName=new Function([param1Name, param2Name,...paramNName], functionBody);].

#The operating environment of this article: windows10 system, javascript 1.8.5, thinkpad t480 computer.

There are generally four ways to declare functions in JavaScript:

Method 1:

function functionName([parameters]){functionBody};

Method 2: Assign an unnamed function function to a specified variable (var )

var add=function(a, b){}

Method 3: Use new operator to declare function

varName=new Function([param1Name, param2Name,...paramNName], functionBody);

Method 4: Write javascript code directly in the middle of html/Jsp code

For example: write in a hyperlink Recommended learning in

<a href="#" onclick="[javascript:] var booleanValue = confirm(&#39;中秋节放假??&#39;); alert(&#39;result = &#39; +booleanValue);">click</a>

: javascript video tutorial

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