foreach循环的每次迭代之间的延迟？

Question

so I am making a simon says game. This function displays the current sequence. The problem with it right now is that it doesn't really go in a nice sequence, it kind of does everything at once. Say the colors are "blue", "red", and "yellow, they will all go off at the same time rather than in sequence. How can I fix this?

var displaySequence = function(){
    compSequence.forEach(function(color){
        $("#" + color).fadeTo(300, 0.5).fadeTo(300, 1.0);
    })
}

Answer 1

A none jQuery solution. You will need to use the array index to give the illusion of waiting between each call, however each function has ran already. What will happen is: show color 1 in 1 second, show color 2 in 2 seconds...

var displaySequence = function(){
    compSequence.forEach(function(color, index){
        setTimeout(function(){
            $("#" + color).fadeTo(300, 0.5).fadeTo(300, 1.0);
        },
        1000 * index);
    })
}

adjust the 1000 * index to change the delay.

Answer 2

I make use of the jQuery delay function

Here is a the javascript.

$(document).ready(function(){

  var compSequence = new Array("red", "blue", "yellow");

  var displaySequence = function() {

      $.each(compSequence, function (i, color) {
        // add delay
        $("#" + color).delay(i * 1000).fadeTo(300, 0).fadeTo(300, 1.0);
      });      
  }

  displaySequence();

});

Here is a DEMO