JavaScript's new Function() method you may not know_javascript tips

Most of us have used JavaScript. In recent years, the popularity of various JavaScript frameworks has made JavaScript more magical and easier. "Anonymous function? I don't know what it is but it looks similar to what I wrote."
You may not know that you can construct a JavaScript function by passing a string as the body of the function to new Function() . It is not often used in programming, but sometimes it can be very useful.

The following is the basic usage of new Function:

Copy the code The code is as follows:

/ / The last parameter is the body of the function (function body), type is string;
// The previous parameters are the parameters (name) of the function to be constructed
var myFunction = new Function('users', ' salary', 'return users * salary');

Pretty simple, right?

The question is: When is it appropriate to use this method instead of using the traditional function declaration function myFnName() and/or anonymous function definition? Andrea Giammarchi believes that the most suitable scenario for using this method of function definition is in NodeJS and In the global environment of the browser:

Copy the code The code is as follows:

(function(win) {


// Perform certain operations in the global environment


})(Function('return this')());

If Have you ever used the new Function pattern? Welcome to leave a message and discuss!