JavaScript计时器-清除，设置新的，循环通过div

Question

我有一些JavaScript循环遍历n个div标记，每次只显示一个，并且每隔10秒更改一次。这是有效的。但我也有"下一步"one_answers"上一页"按钮。他们似乎跳过一个div当我点击下一步或上一个。

有人能帮忙吗?

我们也欢迎任何关于更好方法的建议。我是jQuery的新手，所以我知道我想做一些改进。谢谢! !

jQuery(document).ready(function () {
    var counter = 1;
    var delay = 3000; //10 seconds = 10000
    var lastItem = jQuery('table[id^=featuredNo]').length - 1;
    var previous = 0;
    var timerID;
    //argument is increment
    //false is decrement
    function updateCounter(increment) {
        if (increment) {
            counter = (counter >= lastItem) ? 0 : counter + 1;
            previous = (previous >= lastItem) ? 0 : previous + 1;
        } else {
            counter = (counter <= 0) ? lastItem : counter - 1;
            previous = (previous <= 0) ? lastItem : previous - 1;
        }
    }
    function displayNext() {
        //alert("testt" + counter);
        //hide everything but current
        jQuery("table[id^=featuredNo]").hide();
        jQuery("#featuredNo" + counter).show();
        //incrememnt the counter, so next time we show the next one
        updateCounter(true);
    };
    //set click handlers for previous
    jQuery('a[id^=featuredPrevious]').click(function () {
        clearInterval(timerID);
        updateCounter(false);
        displayNext();
        timerID = setInterval(displayNext, delay);
    });
    //set click handlers for next
    jQuery('a[id^=featuredNext]').click(function () {
        clearInterval(timerID);
        updateCounter(true);
        displayNext();
        timerID = setInterval(displayNext, delay);
    });

    //start interval
    timerID = setInterval(displayNext, delay);
});

Answer 1

最简单的解决方案是从下一个按钮处理程序中删除updateCounter(true)，并在上一个按钮处理程序中添加另一个updateCounter(false):

//set click handlers for previous
jQuery('a[id^=featuredPrevious]').click(function () {
    clearInterval(timerID);
    updateCounter(false);
    updateCounter(false);
    displayNext();
    timerID = setInterval(displayNext, delay);
});
//set click handlers for next
jQuery('a[id^=featuredNext]').click(function () {
    clearInterval(timerID);
    displayNext();
    timerID = setInterval(displayNext, delay);
});