//图片滚动展示 Start
var counts = 4
//大图//
img1 = new Image()
img1.src = 'images/1.jpg'
img2 = new Image()
img2.src = 'images/2.jpg'
img3 = new Image()
img3.src = 'images/3.jpg'
img4 = new Image()
img4.src = 'images/4.jpg'
var smallImg = new Array()
//小图
smallImg[0] = 'images/index_adb1.gif'
smallImg[1] = 'images/index_adb2.gif'
smallImg[2] = 'images/index_adb3.gif'
smallImg[3] = 'images/index_adb4.gif'
//链接地址
url1 = new Image()
url1.src = ' http://www.baidu.com'
url2 = new Image()
url2.src = ' http://www.qzxtg.com'
url3 = new Image()
url3.src = ' http://www.soso.com'
url4=new Image()
url4.src=' http://www.sina.com.cn'
//alt值
alt1 = new Image()
alt1.alt = ''
alt2 = new Image()
alt2.alt = ''
alt3 = new Image()
alt3.alt = ' '
alt4 = new Image()
alt4.alt=''
////欢迎来到标准之路.
var nn = 1
var key = 0
function change_img() {
if (key == 0) {
key = 1
} else if (document.all) {
document.getElementById("pic").filters[0].Apply()
document.getElementById("pic").filters[0].Play(duration = 2)
}
eval('document.getElementById("pic").src=img' + nn + '.src')
eval('document.getElementById("url").href=url' + nn + '.src')
eval('document.getElementById("pic").alt=alt' + nn + '.alt')
if (nn == 1) {
document.getElementById("url").target = "_blank"
document.getElementById("url").style.cursor = "pointer"
} else {
document.getElementById("url").target = "_blank"
document.getElementById("url").style.cursor = "pointer"
}
for ( var i = 1i <= countsi++) {
document.getElementById("xxjdjj" + i).className = 'axx'
}
document.getElementById("xxjdjj" + nn).className = 'bxx'
nn++
if (nn >counts) {
nn = 1
}
tt = setTimeout('change_img()', 7000)
}
function changeimg(n) {
nn = n
window.clearInterval(tt)
change_img()
}
function imageshow() {
document.write('<div class="picshow_main">')
document.write('<div><a id="url"><img id="pic" class="imgbig" /></a></div>')
document.write('<div class="picshow_change">')
for ( var i = 0i <countsi++) {
document.write('<a href="javascript:changeimg(' + (i + 1)
+ ')" id="xxjdjj' + (i + 1)
+ '" class="axx" target="_self"><img src="' + smallImg[i]
+ '"></a>')
}
document.write('</div></div>')
change_img()
}
//图片滚动展示 End
</script>
<script language="javascript" type="text/javascript">
imageshow()
</script>
目标描述:多个图片排列下来,按右边的小按钮,抵达相应位置,鼠标滑动,抵达下一图,或者上一图知识点:onmousewheel,addEventListener,scrollTo,setTimeout
过程:
1.body 宽,高钉死,100vw,100vh,overflow:hidden 使得不出现滚动条,不然不好看
2.图片放进去,排起来,(注意:默认空隙的处理,可以使用flex布局,空隙就不见了)
3.制作相对于视窗的按钮,几张图片就几个按钮,(position: fixed计算一下高度,可以利用calc计算top使得上下居中)
4.美化一下,css写写
5.先写简单的按钮事件
6.写监听滑动事件(onmousewheel在火狐无效,DOMMouseScroll只在火狐有效)
react在componentDidMount的时候监听
7.补充写一下火狐的
9.测试检查一下。
完成啦,啦啦啦~
我的截图:
缺点:这里我是一直对页面进行监听,导致滑动过快对时候动画效果开始执行对时间延后。体现为滑动对轻,整个就流畅一点。
ps:写这种带计算带页面,我觉得是考验思维的,你可以对这里的知识点不熟练,但是你必须得能理解每一步的加加减减。