day7 作业 广告轮播
2018-12-15 本文已影响0人
Gary134
1.图片轮播
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
#bigImg{
width: 500px;
height: 300px;
}
#font{
font-size: 30px;
font-weight: 700;
}
</style>
</head>
<body>
<div id="smallBox">
</div>
<div id="bigBox">
<img id="bigImg"/><br />
<font id="font"></font>
</div>
<script type="text/javascript">
//0.获取节点
var smallBoxNode = document.getElementById('smallBox');
var bigBoxNode = document.getElementById('bigBox');
var bigImgNode = document.getElementById('bigImg');
var fontNode = document.getElementById('font');
//1.获取数据源
var imgArray = [
{
name:'图一',
small_url:'img/thumb-1.jpg',
big_url:'img/picture-1.jpg'
},
{
name:'图二',
small_url:'img/thumb-2.jpg',
big_url:'img/picture-2.jpg'
},
{
name:'图三',
small_url:'img/thumb-3.jpg',
big_url:'img/picture-3.jpg'
}
]
//2.将数据展示在浏览器相应的位置
var currentSmallNode = null;
for (var x in imgArray) {
//根据小图创建节点
var imgObj = imgArray[x];
var smallImgNode = document.createElement('img');
if (x == 0) {
smallImgNode.style.borderBottom = '1px solid red';
currentSamllNode = smallImgNode;
currentSamllNode.index = 0;
}
smallImgNode.src = imgObj.small_url;
//在节点对象中保存和节点相关的信息(添加属性)
smallImgNode.info1 = imgObj;
//添加节点
smallBoxNode.appendChild(smallImgNode);
//绑定事件
smallImgNode.onclick = function(){
bigImgNode.src = this.info1.big_url;
//将之前选中的下边框去掉
currentSamllNode.style.border = 'none';
//选中谁就给谁加下边框
this.style.borderBottom = '1px solid red';
//更新当前节点的值
currentSamllNode = this;
}
}
//3.大图默认显示
bigImgNode.src = imgArray[0].big_url;
fontNode.innerText = imgArray[0].name;
//4.定时事件
// var index = 0；
var inter1 = window.setInterval(function(){
var index = currentSamllNode.index;
var SmallImgNodeArray = smallBoxNode.children;
index++;
if(index == SmallImgNodeArray.length){
index = 0;
}
var smallImgNode = SmallImgNodeArray[index];
bigImgNode.src = imgArray[index].big_url;
fontNode.innerText = imgArray[index].name;
currentSamllNode.style.border = 'none';
smallImgNode.style.borderBottom = '1px solid red';
currentSamllNode = smallImgNode;
currentSamllNode.index = index;
},2000)
</script>
</body>
</html>
