Specific implementation of JS self-calling anonymous functions_javascript skills

In js, a function is often defined as a temporary namespace. Variables defined in this namespace will not pollute the global namespace (to prevent conflicts between local variables and global variables).

Copy code The code is as follows:

function mymodule(){
//module code
}
mymodule();

can be abbreviated as:

Copy code The code is as follows:

(function(){ //mymodule() function is rewritten as an anonymous function expression
//module code
}( )); //End the function definition and call it immediately

or:

Copy the code The code is as follows:

(function(){

}) ();

This way of defining an anonymous function and calling it immediately (self-calling the anonymous function) has become very common, and it is starting to make people a little confused. The source code of jquery is like this Written:

Copy code The code is as follows:

(function( window, undefined ) {

//All code of jquery
})( window );