function in setInterval() executes without delay

问题

I am in the process of making a jquery application to hide an image after a specified interval of time by using setInterval(). The problem is that the hide image function executes immediately without delay.

$(document).ready(function() {

  setInterval(change(), 99999999);

  function change() {
    $('#slideshow img').eq(0).removeClass('show');

  }

});

I am testing it in jsfiddle.

回答1:

http://jsfiddle.net/wWHux/3/

You called the function immediately instead of passing it to setInterval.

setInterval( change, 1500 ) - passes function change to setInterval

setInterval( change(), 1500 ) - calls the function change and passes the result (undefined) to setInterval

回答2:

Where you have setInterval(change(), 99999999); you end up calling the change() function immediately and passing the return value of it to the setInterval() function. You need delay the execution of change() by wrapping it in a function.

setInterval(function() { change() }, 9999999);

Or you can delay it by passing setInterval() just the function itself without calling it.

setInterval(change, 9999999);

Either works. I personally find the first one a bit clearer about the intent than the second.

回答3:

You have setInterval(change(), 99999999); and it should be setInterval(change, 99999999);. See the documentation of setInterval/setTimeout why. :)

Common mistake, happens to me all the time. :)

回答4:

Change setInterval(change(), 99999999); to setInterval(change, 99999999);

And 99999999 means 99999999 milliseconds as you known.

来源：https://stackoverflow.com/questions/7858262/function-in-setinterval-executes-without-delay

标签

javascript

jquery

setinterval