js anonymous call implementation code

OK, see how anonymous functions are called.
1. Function call that gets the return value after execution
Js code

Copy the codeThe code is as follows:

//Method 1, call the function and get the return value.  Force operator to make function calls execute
(function(x,y){ 
alert(x+y); 
return x+y; 
}(3,4)); 

Js code
//Method 2: Call the function and get the return value. Force the function to execute directly and return a reference, and then call to execute

Copy the codeThe code is as follows:

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

2. Ignore the return value after execution
Js code

Copy the codeThe code is as follows:

//Method 3: Call the function and ignore the return value
void function(x) { 
x = x-1; 
alert(x); 
}(9); 

//Method 3: Call the function and ignore the return value

Copy the codeThe code is as follows:

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

Well, finally, look at the wrong call method
Js code
//Incorrect call method

Copy the codeThe code is as follows:

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