防止功能运行两次

问题描述

我有一个自动运行的幻灯片，您可以通过单击按钮跳到图像。

如果在图像静止时单击其中一个按钮，则效果很好，但如果在淡入淡出功能运行时单击，它将使功能运行两次，从而产生某种循环，最终使浏览器停滞不前！

我知道我需要添加某种“ isRunning”标志，但是我不知道在哪里。

这是jsfiddle的链接-http:

还有下面的代码...

javascript：

$(document).ready(function() {

var images=new Array();
var locationToRevealCount=6;
var nextimage=2;
var t;
var doubleclick;

addIcons();

function addIcons() {
    while (locationToRevealCount>0) {
        $("#extraImageButtons").append('<img class="galleryButtons" src="http://www.steveszone.co.uk/images/button_sets/pink_square_button1n.png" alt="'+locationToRevealCount+'" />');
        images[locationToRevealCount]='http://www.tombrennand.net/'+locationToRevealCount+'a.jpg';
        locationToRevealCount--;
    };
    $('.homeLeadContent').prepend('<img class="backgroundImage" src="http://www.tombrennand.net/1a.jpg" />');
    $("#extraImageButtons img.galleryButtons[alt*='1']").attr("src","http://www.steveszone.co.uk/images/button_sets/black_square_button1n.png");
    runSlides();
}

function runSlides() {
    clearTimeout(t);
    t = setTimeout(doSlideshow,3000);
}

function doSlideshow() {
    if($('.backgroundImage').length!=0)
        $('.backgroundImage').fadeOut(500,function() {
            $('.backgroundImage').remove();
            slideshowFadeIn();
        });
    else
        slideshowFadeIn();
}

function slideshowFadeIn() {
    if(nextimage>=images.length) 
        nextimage=1;

    $("#extraImageButtons img.galleryButtons").attr("src","http://www.steveszone.co.uk/images/button_sets/pink_square_button1n.png");
    $("#extraImageButtons img.galleryButtons[alt*='"+nextimage+"']").attr("src","http://www.steveszone.co.uk/images/button_sets/black_square_button1n.png");

    $('.homeLeadContent').prepend($('<img class="backgroundImage" src="'+images[nextimage]+'" style="display:none;">').fadeIn(500,function() {
        nextimage++;
        runSlides();

    }));
}

$("#extraImageButtons img.galleryButtons").live('click', function() {
    nextimage=$(this).attr("alt");
    $("#extraImageButtons img.galleryButtons").attr("src","http://www.steveszone.co.uk/images/button_sets/pink_square_button1n.png");
    $(this).attr("src","http://www.steveszone.co.uk/images/button_sets/black_square_button1n.png");
    clearTimeout(t);
    doSlideshow();
});
});

的HTML：

<div class="homeLeadContent" style="width:965px;">

</div>
<div id="extraImageButtons"></div>