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Teach you how to write a JD elevator carousel

一个新手Original: 2017-09-09 10:21:581442browse

Effect knowledge points: enterprise layout skills, how to write CSS styles efficiently, commonly used selectors, basic tags, box models, jquery class library calls, JS special effects writing, JS programming thinking, etc.

Jingdong elevator carousel source code:

<!doctype html>
<htmllang="en">
<head>
<!--网站编码格式，UTF-8 国际编码，GBK或 gb2312 中文编码-->
<metacharset="UTF-8">
<metaname="Keywords"content="关键词一，关键词二">
<metaname="Description"content="网站描述内容">
<title>Document</title>
<!--引用css js 文件的引入-->
<styletype="text/css">
*{margin:0px;}
/* 属性:值; 身高:1.7m; 颜色:红色; px像素*/
#flash{width:670px;/*宽*/height:240px;/*高*/background:#cc99cc;/*背景颜色*/
        margin:200pxauto 0px;
        position:relative;/*相对定位*/overflow:hidden;/*超出部分隐藏*/}
#flash .scroll{width:670px;height:2400px;
                position:absolute;/*绝对定位*/left:0px;top:0px;}
#flash .scroll img{display:block;/*块级*/}
#flash ul.button{height:20px;width:144px;position:absolute;
                bottom:20px;right:10px;}
#flash ul.button li{list-style-type:none;/*去掉圆点*/
        width:20px;height:20px;background:#666;float:left;/*左浮动*/
        margin:0px2px;
        color:#fff;text-align:center;/*水平距中*/
        font-size:12px;
        line-height:20px;/*行高 文字竖直距中*/
        border-radius:10px;/*圆半径*/
        box-shadow:2px2px 5px #000; }
#flash ul.button li.hover{background:#cc3300;}
</style>
</head>
<body>
<!--p 盒子模型，高度，宽度，放内容的长方形容器 姓名=“张三”-->
<pid="flash">
    <!--图片滚动开始-->
    <pclass="scroll">
        <imgsrc="images/1.jpg" />
        <imgsrc="images/2.jpg" />
        <imgsrc="images/3.jpg" />
        <imgsrc="images/4.jpg" />
        <imgsrc="images/5.jpg" />
        <imgsrc="images/6.jpg" />
    </p>
    <!--图片滚动结束-->
    <!--按扭开始-->
    <ulclass="button">
        <liclass="hover">1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        <li>6</li>
    </ul>
    <!--按扭结束-->
</p>
<!--引用 jqeury　文件-->
<scripttype="text/javascript"src="js/jquery.js"></script>
<scripttype="text/javascript">
    var_index=0;
    varsetTime=null;
    $("ul.button li").hover(function(){
        clearInterval(setTime);//清处定时播放器
        _index=$(this).index();
        //alert(_index);
        // 给添加　class="hover"
        $(this).addClass("hover").siblings("li").removeClass("hover");
        $(".scroll").animate({top:-(_index*240)},1000);
    },function(){
        autoPlay();//鼠标移开，调用自动播放
    });
    //自动轮播
    functionautoPlay(){
        setTime=setInterval(function(){
            _index++;//序列号加 1
            if(_index>5){_index=0;}//当播到最后一张时，回到第一张
            $("ul.button li").eq(_index).addClass("hover").siblings("li").removeClass("hover");
            $(".scroll").animate({top:-(_index*240)},1000);
        },2000);
        
    }
    autoPlay();
</script>
<!--
    1、如何在页面当中构建一个有宽度，高度的长方形 （p盒子模型）
    2、讲到了外边距的概念 margin, 解决了外边距的兼容型问题 *{margin:0px;}
    3、利用外边距来控制长方形的位置 margin:上(200px) 左右(auto) 下(0px);
    4、分析了动画实现原理（在 #flash)长方形里，构建了一个宽度一样大小，高度无限高的长方      形) 然后利用相对和绝对定位来实现他的动画原理
    5、如何在页面当中插入一张图 <img src="地址"/>
    6、处理了图片之间产生间隙的问题（display:block;） 超出部分内容隐藏 overflow:hidden;
    7、讲ul无序列表标签 （去掉li的圆点，给li添加宽度和高度 利用把小长方形从竖直变成水平      控制文字大小，颜色　水平距中，竖直距中，利最新技术css3 把正方形变成圆形              border-radius:10px; 利用外边距产生兼距）
-->
</body>
</html>

Finally give the program Some suggestions from members:

1. There is no so-called "best language" Some languages and tools are only used to solve specific corresponding problems. A little better than others. When learning a new language, don't try to bring your past thought patterns into the new language system. Accordingly, we should learn how to program in a new language more "authentically".

2. Relax and stay "simple" Programming is a huge collection of Lego bricks, full of All kinds of interesting problems that need to be solved. Taking the time to write interesting programs in order to deeply understand the structure will be more interesting than any appointment given to you.

3. The best programmers always try programming outside of work. If you really love it and are good at it, you will never be unemployed.

4. When you get stuck, write down your program on paper. I was serious. This is amazing and is the standard training pattern in programming competitions. (The reason I think this works is that when you don't have to spend energy thinking about syntax, you have more energy thinking about the nature of the problem and how to solve it).

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