console 命令行工具 X clear

console

<body>
  <div class="box">
    <ul>
      <li><img originalsrc="http://ww1.sinaimg.cn/mw690/006qf0pNgy1fgzuqlle0wj311y0lcgrh.jpg" /></li>
        <li><img originalsrc="http://ww1.sinaimg.cn/mw690/006qf0pNgy1fgzuqlle0wj311y0lcgrh.jpg" /></li>
        <li><img originalsrc="http://ww1.sinaimg.cn/mw690/006qf0pNgy1fgzuqlle0wj311y0lcgrh.jpg" /></li>
        <li><img originalsrc="http://ww1.sinaimg.cn/mw690/006qf0pNgy1fgzuqlle0wj311y0lcgrh.jpg" /></li>
        <li><img originalsrc="http://ww1.sinaimg.cn/mw690/006qf0pNgy1fgzuqlle0wj311y0lcgrh.jpg" /></li>
        <li><img originalsrc="http://ww1.sinaimg.cn/mw690/006qf0pNgy1fgzuqlle0wj311y0lcgrh.jpg" /></li>
        <li><img originalsrc="http://ww1.sinaimg.cn/mw690/006qf0pNgy1fgzuqlle0wj311y0lcgrh.jpg" /></li>
        <li><img originalsrc="http://ww1.sinaimg.cn/mw690/006qf0pNgy1fgzuqlle0wj311y0lcgrh.jpg" /></li>
        <li><img originalsrc="http://ww1.sinaimg.cn/mw690/006qf0pNgy1fgzuqlle0wj311y0lcgrh.jpg" /></li>
        <li><img originalsrc="http://ww1.sinaimg.cn/mw690/006qf0pNgy1fgzuqlle0wj311y0lcgrh.jpg" /></li>
    </ul>
        </div>
  <script>
    
jQuery.fn.extend({
    delayLoading: function(a) {
        function g(d) {
            var b, c;
            if (a.container === undefined || a.container === window) {
                b = $(window).scrollTop();
                c = $(window).height() + $(window).scrollTop()
            } else {
                b = $(a.container).offset().top;
                c = $(a.container).offset().top + $(a.container).height()
            }
            return d.offset().top + d.height() + a.beforehand >= b && c >= d.offset().top - a.beforehand
        }
        function h(d) {
            var b, c;
            if (a.container === undefined || a.container === window) {
                b = $(window).scrollLeft();
                c = $(window).width() + $(window).scrollLeft()
            } else {
                b = $(a.container).offset().left;
                c = $(a.container).offset().left + $(a.container).width()
            }
            return d.offset().left + d.width() + a.beforehand >= b && c >= d.offset().left - a.beforehand
        }
        function f() {
            e.filter("img[" + a.imgSrcAttr + "]").each(function(d, b) {
                if ($(b).attr(a.imgSrcAttr) !== undefined && $(b).attr(a.imgSrcAttr) !== null  && $(b).attr(a.imgSrcAttr) !== "" && g($(b)) && h($(b))) {
                    var c = new Image;
                    c.onload = function() {
                        $(b).attr("src", c.src);
                        a.duration !== 0 && $(b).hide().fadeIn(a.duration);
                        $(b).removeAttr(a.imgSrcAttr);
                        a.success($(b))
                    }
                    ;
                    c.onerror = function() {
                        $(b).attr("src", 
                        a.errorImg);
                        $(b).removeAttr(a.imgSrcAttr);
                        a.error($(b))
                    }
                    ;
                    c.src = $(b).attr(a.imgSrcAttr)
                }
            })
        }
        a = jQuery.extend({
            defaultImg: "",
            errorImg: "",
            imgSrcAttr: "originalSrc",
            beforehand: 0,
            event: "scroll",
            duration: "normal",
            container: window,
            success: function() {},
            error: function() {}
        }, a || {});
        if (a.errorImg === undefined || a.errorImg === null  || a.errorImg === "")
            a.errorImg = a.defaultImg;
        var e = $(this);
        if (e.attr("src") === undefined || e.attr("src") === null  || e.attr("src") === "")
            e.attr("src", a.defaultImg);
        f();
        $(a.container).bind(a.event, function() {
            f()
        })
    }
});
  </script>
        <script>
$(function () {
	$("img").delayLoading({
		defaultImg: "http://ww1.sinaimg.cn/mw690/006qf0pNgy1fgzupvprnvj311y0lc0wl.jpg",           // 预加载前显示的图片
		errorImg: "",                        // 读取图片错误时替换图片(默认：与defaultImg一样)
		imgSrcAttr: "originalSrc",           // 记录图片路径的属性(默认：originalSrc，页面img的src属性也要替换为originalSrc)
		beforehand: 0,                       // 预先提前多少像素加载图片(默认：0)
		event: "scroll",                     // 触发加载图片事件(默认：scroll)
		duration: "slow",                  // 三种预定淡出(入)速度之一的字符串("slow", "normal", or "fast")或表示动画时长的毫秒数值(如：1000),默认:"normal"
		container: window,                   // 对象加载的位置容器(默认：window)
		success: function (imgObj) { },      // 加载图片成功后的回调函数(默认：不执行任何操作)
		error: function (imgObj) { }         // 加载图片失败后的回调函数(默认：不执行任何操作)
	});
});
</script>
        
        </body>

.box{ width:1200px; margin:0 auto;}
.box ul li { height:245px; float:left; margin:10px; border:1px solid #e6e6e6; list-style:none; }
.box ul li img{ min-height:245px;}

本项目引用的自定义外部资源

jquery.min.js