A small example of JavaScript self-executing closure_javascript skills

Copy code The code is as follows:

//No parameters
(function(){
alert('hello');
})();

//With parameters
(function(name){
alert('Hello ' name);
})('world');

What is the use of this closure? At first glance, it is surrounded by parentheses, and local variables cannot escape and cause trouble everywhere. This is one of its main uses. Of course, it is also indispensable for encapsulating some JavaScript libraries.