基于jQuery的图片懒加载插件

其他 2020-03-17 10:13:02 阅读次数: 0

代码仅供学习，主要的地方都写上注释了，写的不好请大佬们指出，谢谢

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>图片懒加载</title>
</head>
<style type="text/css">
    * {
        margin: 0;
        padding: 0;
    }
    ul,li {
        list-style: none;
    }
    .container li {
        float: left;
        margin: 10px 10px;
    }
    .container li img {
        width: 310px;
        height: 206px;
    }
</style>

<body>
    <div>
        <ul class="container" style="overflow: hidden">
            <li><img src="" data-src="http://b-ssl.duitang.com/uploads/item/201507/13/20150713153609_YKU8V.jpeg"></li>
            <li><img src="" data-src="http://b-ssl.duitang.com/uploads/item/201507/13/20150713153609_YKU8V.jpeg"></li>
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        </ul>
    </div>
    <script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
    <script type="text/javascript">
        $.fn.extend({
            lazyImg: function () {
                var promise = {
                    // 监听滚动事件
                    bind: function ($target, $c) {
                        var me = this,
                            timer = null,
                            interval = 100;

                        $(window).on('scroll', function(e){
                            timer && clearTimeout(timer);// 优化滚动的时候重复执行滚动事件
                            timer = setTimeout(function(){
                                me.checkShow($target, $c);
                            }, interval);
                        });
                    },
                    // 检测是否展示图片
                    checkShow: function ($target, $c) {
                        var me = this;
                        $target.each(function () {
                            var $cur = $(this);
                            if (me.isShow($cur, $c)) {
                                setTimeout(function () {
                                    me.showImg($cur);
                                },300);
                            }
                        });
                    },
                    // 判断是否在可视窗口内
                    isShow: function ($el, $c) {
                        var scrollH = $c.scrollTop(),
                            winH = $c.height(),
                            top = $el.offset().top;
                        if (top < winH + scrollH) {
                            if ($el.data('isLoaded') === true) {// 判断是否已经加载，加载则不用重复调用
                                return false;
                            } else {
                                $el.data('isLoaded', true)
                                // console.log(scrollH+winH, top);
                                return true;
                            }
                        }else{
                            return false;
                        }
                    },
                    // 展示图片
                    showImg: function ($el) {
                        $el.attr('src',$el.attr('data-src'));
                    }
                }
                var $imgs = this;
                this.$c = $(window);
                this.$target = $imgs;
                promise.checkShow(this.$target, this.$c);// 初始化时判断一次
                promise.bind(this.$target, this.$c);
                return this;
            }
        })
        $('img').lazyImg();// 调用格式
    </script>
</body>
</html>
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