日报_34Remember, quitters never win...and winners never quit.

2020年6月7日星期日

Remember, quitters never win...and winners never quit.

今天早上的话就是对面试题进行一个背诵然后，就开始写了一下这个js的小案例，不巧的是家里断电了，一直到晚上7点多才来的电，把我今天得安排都搞乱了，没办法只好晚上在加班，后台管理系统得话，我负责得Echarts的那块也弄得差不多了，写得过程中也遇到过问题，然会呢也通过百度查阅文档，以及看B站上的视频进行学习.

js小案例分享


<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>轮播效果</title>
<style>
body,div,ul,li{
    margin:0;
    padding:0;
}
ul{
list-style-type:none;
}
body{
background:#000;
text-align:center;
font:12px/20px Arial;
#box{
position:relative;
width:492px;
height:172px;
background:#fff;
border-radius:5px;border:8px solid #fff;
margin:10px auto; 
}
#box .list{
position:relative;
width:490px;
height:170px;
overflow:hidden;
border:1px solid #ccc;  
}
#box .list li{
    position:absolute;top:0;
    left:0;width:490px;
    height:170px;
    opacity:0;
    filter:alpha(opacity=0);
}
#box .list li.current{
    opacity:1;
    filter:alpha(opacity=100);
}
#box .count{
    position:absolute;
    right:0;bottom:5px;   
}
#box .count li{
    color:#fff;
    float:left;
    width:20px;
    height:20px;
    cursor:pointer;
    margin-right:5px;
    overflow:hidden;
    background:#F90;opacity:0.7;
    filter:alpha(opacity=70);
    border-radius:20px;
}
#box .count li.current{
    color:#fff;opacity:1;
    filter:alpha(opacity=100);
    font-weight:700;
    background:#f60;
}
#tmp{
    width:100px;
    height:100px;
    background:red;
    position:absolute;
}
</style>
<script type="text/javascript">
window.onload = function ()
{
	var oBox = document.getElementById("box");
	var aUl = document.getElementsByTagName("ul");
	var aImg = aUl[0].getElementsByTagName("li");
	var aNum = aUl[1].getElementsByTagName("li");
	var timer = play = null;
	var i = index = 0;	
	var bOrder = true;
	
	//切换按钮
	for (i = 0; i < aNum.length; i++)
	{
		aNum[i].index = i;
		aNum[i].onmouseover = function ()
		{
			show(this.index)
		}
	}
	
	//鼠标划过关闭定时器
	oBox.onmouseover = function ()
	{
		clearInterval(play)	
	};
	
	//鼠标离开启动自动播放
	oBox.onmouseout = function ()
	{
		autoPlay()
	};	
	
	//自动播放函数
	function autoPlay ()
	{
		play = setInterval(function () {
			//判断播放顺序
			bOrder ? index++ : index--;			
			
			//正序
			index >= aImg.length && (index = aImg.length - 2, bOrder = false);
			
			//倒序
			index <= 0 && (index = 0, bOrder = true);
			
			//调用函数
			show(index)
		},2000);	
	}
	autoPlay();//应用
	
	//图片切换, 淡入淡出效果
	function show (a)
	{
		index = a;
		var alpha = 0;
		for (i = 0; i < aNum.length; i++)aNum[i].className = "";
		aNum[index].className = "current";
		clearInterval(timer);			
		
		for (i = 0; i < aImg.length; i++)
		{
			aImg[i].style.opacity = 0;
			aImg[i].style.filter = "alpha(opacity=0)";	
		}
		
		timer = setInterval(function () {
			alpha += 2;
			alpha > 100 && (alpha =100);
			aImg[index].style.opacity = alpha / 100;
			aImg[index].style.filter = "alpha(opacity = " + alpha + ")";
			alpha == 100 && clearInterval(timer)
		},20);
	}
};
</script>
</head>
<body>
<div id="box">
    <ul class="list">
        <li class="current"><img src="img/01.jpg" width="490" height="170" /></li>
        <li><img src="img/02.jpg" width="490" height="170" /></li>
        <li><img src="img/03.jpg" width="490" height="170" /></li>
        <li><img src="img/04.jpg" width="490" height="170" /></li>
        <li><img src="img/05.jpg" width="490" height="170" /></li>
    </ul>
    <ul class="count">
        <li class="current">1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
    </ul>
</div>
</body>
</html>