Question

I am quiet new to javascript, can not understand that why all javascript calls are asynchronous,

for example, we have calling with order like

call_function1;

call_function2:

if function2 is depend on the results of function1, that can not be ensured, because the execution is asynchronous. Is that true ? And why ?

If true, how to ensure they are synchronous.

If this is duplicated question, I am sorry, because it is quiet new for me.

Thanks fo your answer first.

Answer 1

JavaScript calls are synchonous. If second function depends on results of first function, you might use callbacks model.

function foo(callback) {
  var results = // get some results;
  callback(results);
}

function boo(results) {
  // do something with results here..
}

foo(boo);