javascript - Syntax issues about immediately executing functions in JS

Question

(function () {
    console.log('test');
}());

(function() {
    console.log('test');
})();

I found that both of them can print out test. What is the difference? How to understand it? I hope God can teach me.

Answer 1

There is no difference in operation. In terms of semantics, the first one is to treat the entire function execution result as an expression, and the second one is to treat the function as an expression