The difference between a function object and an object in JavaScript

function Test (word) {    console.log (word);} Test (' Haha, I am a function '), new Test (' Haha, I am the object ');//The above call mode in a more understandable way test.call ("Haha, I am the function");     Equivalent to test ();//equivalent to new test (); var obj = {};obj._proto_ = Test.prototype; Test.call (obj);

　

The essential difference is that this is different from the two calls. Test(‘...‘);when called, the inside of this is the top-level object window , and the return value is undefined. new Test(‘...‘);when called, it will start with a new object, set the type to test, then use it as Test the This function, and finally return the object.

From SF

The difference between a function object and an object in JavaScript