Summary of how anonymous functions are called in Javascript

There are many ways to define functions in Javascript, one of which is the function direct. Var fun = function(){}, where function is an anonymous function if it is not assigned to fun. Ok, let's see how the anonymous function is called.

Method 1, call the function, get the return value. The force operator causes the function call to execute

(function(x,y){ 
    alert(x+y); 
    return x+y; 
}(3,4)); 

Method 2, call the function, get the return value. Force the direct execution of a function to return a reference, which then calls the execution

(function(x,y){ 
    alert(x+y); 
    return x+y; 
})(3,4); 

This is also a popular way to call libraries like jQuery and Mootools

Method 3, use void

void function(x) { 
      x = x-1; 
      alert(x); 
}(9);

Mode 4, use the -/+ operator

-function(x,y){ 
    alert(x+y); 
    return x+y; 
}(3,4); 

+function(x,y){ 
    alert(x+y); 
    return x+y; 
}(3,4); 

--function(x,y){ 
    alert(x+y); 
    return x+y; 
}(3,4); 

++function(x,y){ 
    alert(x+y); 
    return x+y; 
}(3,4);

Mode 5, using tilde (~)

~function(x, y) { 
    alert(x+y); 
   return x+y; 
}(3, 4);

Finally, look at the wrong invocation

function(x,y){ 
    alert(x+y); 
    return x+y; 
}(3,4);