javascript，jquery。 不会淡出

Question

I am new to javascript and jquery, so, as a challenge, I am doing little game and ran into the problem today.

So, the code works like: there appears some text and after some time it needs to fadeOut , but it just won't fadeOut for me...

Here's my code:

var timeToStart = 3;      
var timer = 0;

function count() {            
    document.getElementById("gameStarter").innerHTML = timeToStart + " s";      
    timeToStart = timeToStart - 1;            
} 

$("#start").click(function() {            
    $("#gameStart").fadeIn(500, function() {        
        timer = setInterval(count, 1000);                
        setTimeout(function() {clearInterval(timer);}, 4000);       
        if (timeToStart == 0) {      
            $("#gameStart").fadeOut(500)            
        }                       
    });
});

Answer 1

(gcampbell and Patrick Evans pointed this out in the comments. As they haven't posted an answer, I'll post a CW.)

Your code here

timer = setInterval(count, 1000);

setTimeout(function() {clearInterval(timer);}, 4000);

if (timeToStart == 0) {

  $("#gameStart").fadeOut(500)

}

only runs your if statement once, before everything is finished running. Right now it passes over it once, when timeToStart still equals 3. I recommend putting your if statement inside of your count() function like this

function count() {

  document.getElementById("gameStarter").innerHTML = timeToStart + " s";

  timeToStart = timeToStart - 1;

  if (timeToStart == 0) {

    $("#gameStart").fadeOut(500)

  }

}

so it checks it every time its run, instead of only once.

Live Example:

 $("#gameStart").hide(); var timeToStart = 3; var timer = 0; function count() { document.getElementById("gameStarter").innerHTML = timeToStart + " s"; timeToStart = timeToStart - 1; if (timeToStart == 0) { $("#gameStart").fadeOut(500) } } $("#start").click(function() { $("#gameStart").fadeIn(500, function() { timer = setInterval(count, 1000); setTimeout(function() { clearInterval(timer); }, 4000); }); });

 <div id="gameStarter"></div> <div id="gameStart">This is gamestart</div> <input type="button" id="start" value="Start"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>