匿名setTimeout函数

Question

i have a situation where i am waiting for a couple of events to happen. i see many good examples of how to use the setTimeout using a named function, but is there a way to use some sort of anonymous method for a timeout?

the code currently looks something like this:

testForObject();

function testForObject() {
    if  ( typeof marksObjectName === 'object' )  {
           // blah blah
    } else {
       console.log('marksObjectName does not exist quite yet');
       setTimeout(function() { testForObject() }, 500 );
    }
}

so i was wondering if there is some way naming the function during setTimeout and use an anonymous method instead, perhaps something like this:

setTimeout(function() {
    if  ( typeof marksObjectName === 'object' )  {
           // blah blah
    } else {
       console.log('marksObjectName does not exist quite yet');
    }
}, 500);

obviously this does not work, but it was my first (and only) guess.

thank you all very much.

Answer 1

You can name the passed function, like

setTimeout(function myFunction() {
    // ...
}, 500);

Answer 2

You can name the function as follows. Note that you will need to put it within another timeout within the else clause:

 setTimeout(function timer() { if (typeof marksObjectName === 'object') { // blah blah } else { console.log('marksObjectName does not exist quite yet'); setTimeout(timer, 500); } }, 500); 

Answer 3

我相信hat setInterval是您想要的。

setInterval(function() { if ( typeof marksObjectName === 'object' ) { // blah blah } else { console.log('marksObjectName does not exist quite yet'); } }, 500);