How to declare functions in JavaScript

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The way to declare a function in JavaScript: declare a function using new, for example, [varName=new Function ([param1Name, param2Name,...paramNName], functionBody);].

This article operating environment: windows10 system, javascript 1.8.5, thinkpad T480 computer.

There are four ways to declare a function 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: declare a function using the new operator

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

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

For example, write in a hyperlink