javascript - 一個click事件的bug不知道哪裡出錯了

Question

1、當圖片滾動嘴右側後，再快速點擊左側箭頭時，放大鏡功能失效，其它情況下貌似隨便怎麼點都沒有問題。

查不出哪裡出問題了，使用了stop(),和clearQueue()，也沒有效果

#html程式碼

<p class="slide">
        <p class="slide-big"></p>
        <p class="slide-small">
            <p class="slide-move"></p>
            <ul>
                <li><img src="1.jpg" alt=""></li>
                <li><img src="2.jpg" alt=""></li>
                <li><img src="3.jpg" alt=""></li>
                <li><img src="4.jpg" alt=""></li>
                <li><img src="5.jpg" alt=""></li>
                <li><img src="3.jpg" alt=""></li>
            </ul>
        </p>
        <!-- <p class="slide-btn">
            <span class="slide-btn-pre"></span>
            <span class="slide-btn-next"></span>
            <ul>
                <li><img src="1.jpg" alt=""></li>
                <li><img src="2.jpg" alt=""></li>
                <li><img src="3.jpg" alt=""></li>
                <li><img src="4.jpg" alt=""></li>
                <li><img src="5.jpg" alt=""></li>
                <li><img src="3.jpg" alt=""></li>
            </ul>
        </p> -->
    </p>

css

*{
    padding: 0;
    margin: 0;
}
li{
    list-style: none;
}

.slide{
    position: relative;
    margin: 200px auto;
    width: 320px;
}
.slide-small{
    position: relative;
    width: 318px;
    height: 318px;
    border: 1px solid #ccc;
}
.slide-small li{
    position: absolute;
    left: 0;
    top: 0;
    width: 318px;
    height: 318px;
    overflow: hidden;
    display: none;
}
.slide-small li img{
    width: 318px;
    height: 318px;
}


.slide-btn{
    position: relative;
    margin-top: 22px;
    width: 318px;
    height: 57px;
    overflow: hidden;
}
.slide-btn ul{
    position: absolute;
    left: 30px;
    top: 0;
    /*width: 1000%;*/
    /*left: 30px;*/
}
.slide-btn li{
    float: left;
    width: 67px;
    height: 57px;
    cursor: pointer;
    /*margin-right: 10px;*/
}
.slide-btn li.active img{
    border: 1px solid #C70000;
}
.slide-btn li img{
    width: 53px;
    height: 53px;
    border: 1px solid #ccc;
    padding: 1px;
}
.slide-btn span{
    position: absolute;
    top: 0;
    display: block;
    width: 30px;
    height: 57px;
    cursor: pointer;
    z-index: 10;
    background-color: #fff;
}
.slide-btn-pre{
    left: 0;
    background: url(left.gif) no-repeat 0 12px;
}
.slide-btn-next{
    right: 0;
    background: url(right.gif) no-repeat 12px 12px;
}

.slide-big{
    position: absolute;
    left: 320px;
    top: 0;
    border: 1px solid #eee;
    width: 400px;
    height: 400px;
    overflow: hidden;
    display: none;
}
.slide-big img{
    position: absolute;
    width: 720px;
    height: 720px;
}

.slide-move{
    position: relative;  
    display: none;
    width:120px;  
    height: 120px;
    background: #ffffcc;  
    opacity: .3;
    filter:progid:DXImageTransform.Microsoft.Alpha(Opacity=30);
    -ms-filter:'progid:DXImageTransform.Microsoft.Alpha(Opacity=30)';
    cursor: move;
    z-index: 333;
}

jQuery

;jQuery(function () {

    $('.slide').append('<p class="slide-btn"><span class="slide-btn-pre"></span><span class="slide-btn-next"></span></p>')
    $('.slide').find('ul').clone(true).appendTo('.slide-btn');

    function _clickInit() {
        $('.slide-btn').find('li').eq(0).trigger('click');
    }
    setTimeout(_clickInit, 100);

    function _imgState (index) {
        $('.slide-small').find('li').eq(index).stop(true, true).fadeIn(500).addClass('active').siblings().fadeOut(500).removeClass('active');
        $('.slide-btn').find('li').eq(index).stop(true, true).addClass('active').siblings().removeClass('active');
        $('.slide-big').html( $('.slide-small').find('li').eq(index).html() );
    }

    $('.slide-btn').find('li').on('click', function() {
        var index = $(this).index();
        _imgState(index);
        _slideMagnifier(index);
    });

    $('.slide-btn-next').on('click', function() {
        var index = $('.slide-small').find('li').index( $('.active') );
        index++;

        var slidebtnLiWidth = $('.slide-btn li').width();
        var moveLeftWidth = parseInt( $('.slide-btn ul').css('marginLeft') ) - slidebtnLiWidth;

        if ( moveLeftWidth >= -($('.slide-btn li').length * slidebtnLiWidth - slidebtnLiWidth * 4) ) {
            $('.slide-btn ul').css({
                marginLeft: moveLeftWidth
            });
        }

        _imgState(index);
        _slideMagnifier(index);

    });

    $('.slide-btn-pre').on('click', function() {
        var index = $('.slide-small').find('li').index( $('.active') );
        index--;

        var slidebtnLiWidth = $('.slide-btn li').width();
        var moveLeftWidth = parseInt( $('.slide-btn ul').css('marginLeft') ) + slidebtnLiWidth;

        if ( parseInt( $('.slide-btn ul').css('marginLeft') ) < 0 ) {
            $('.slide-btn ul').css({
                marginLeft: moveLeftWidth
            });
        }
        if (index >= 0) {
            _imgState(index);
            _slideMagnifier(index);
        }
    });

    function _slideMagnifier (index) {
        var objSlideSmall = $('.slide-small');
        var objslideSmallLi = $('.slide-small li').eq(index);
        var objSlideMove = $('.slide-move');
        var objSlidebig = $('.slide-big');
        var objSlidebigImage = $('.slide-big').find('img');

        objSlideSmall.on('mouseover', function(e) {
            objSlideMove.css({  
                display: 'block'
            });
            objSlidebig.css({
                display: 'block'
            });
        });

        objSlideSmall.on('mouseout', function() {
            objSlideMove.hide(); 
            objSlidebig.hide(); 

        });

        objSlideSmall.on('mousemove', function(e) {

            var left = e.pageX - objslideSmallLi.offset().left - objSlideMove.width() / 2;  
            var top = e.pageY - objslideSmallLi.offset().top - objSlideMove.width() / 2;  

            if( left < 0 ){  
                left = 0;  
            } else if ( left > objslideSmallLi.width() - objSlideMove.width() ) {  
                left = objslideSmallLi.width() - objSlideMove.width();  
            }
              
            if( top < 0 ){  
                top = 0;  
            } else if ( top > objslideSmallLi.height() - objSlideMove.width() ){  
                top = objslideSmallLi.height() - objSlideMove.height();  
            }
            
            objSlideMove.css({ //鼠标跟随
                left : left + "px",
                top : top + "px"
            });   
            
            var precentX = left / ( objslideSmallLi.outerWidth() - objSlideMove.outerWidth() );  
            var precentY = top / ( objslideSmallLi.outerHeight() - objSlideMove.outerHeight() );  
              
            var x = precentX * ( objSlidebigImage.outerWidth()-objSlidebig.outerWidth() );  
            var y = precentY * ( objSlidebigImage.outerHeight() - objSlidebig.outerHeight() ); 

            objSlidebigImage.css({  // 放大镜
                left : -x + "px",  
                top : -y +"px"  
            });

        });
    }

程式碼寫的比較爛，希望大神幫助一下

Answer 1

這裡
$('.slide-btn-next').on('click', function() {

    var index = $('.slide-small').find('li').index( $('.active') );
    index++;
  

到最後一張圖再點下一張，index會變成6，超出範圍，加個判斷 index = index >= 5 ? 5 : index