The following editor will bring you a JS native carousel image with white dotsExample explanation. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.
We just talked about the js native carousel image, now add small dots to it that can move along with it!
css code:
*{ margin:0px; padding: 0px; } ul{ width: 2500px; height: 300px; position: absolute; } li{ float: left; list-style: none; } img{ width: 500px; height: 300px; } p{ width: 500px; height: 300px; margin: 50px auto; position: relative; overflow: hidden; } /*小白点的ul*/ #round_ul{ width:300px; height: 30px; /*background:yellow;*/ position: relative; margin: 250px auto; } #round_ul li{ width: 20px; height:20px; border-radius: 50%; background: #2196f3; margin-left: 50px; cursor: pointer; }
HTML code:
<p> <ul> <li><img src="img/31.jpg"></li> <li><img src="img/32.jpG"></li> <li><img src="img/33.jpG"></li> <li><img src="img/34.jpg"></li> <li><img src="img/31.jpg"></li> </ul> <ul id="round_ul"> <li></li> <li></li> <li></li> <li></li> </ul>
JS part:
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<script type="text/javascript"> //页面加载完成后 执行代码 window.onload = function(){ //获取 ul var imgUl = document.getElementsByTagName("ul")[0]; var groundUl = document.getElementById("round_ul"); //把第一个小白点修改成红色children 节点的子节点(不算空白节点) groundUl.children[0].style.backgroundColor = "red"; var sId,x = 0; //开始计时器函数 function fn(){ sId = setInterval(abc,10); } function abc(){ //每隔10秒修改ul的坐标,修改1px imgUl.style.left = x-- +"px"; //如果一张图片完全进入到p中 if(x % 500 == 0){ //调用修改小白点函数 if(x == -2000){ x = 0; imgUl.style.left = 0 +"px"; } changLi(Math.abs(x/500));//调用修改小白点方法 clearInterval(sId);//暂定定时器 setTimeout(fn,1000);//隔100毫秒在次启动定时器 } } fn(); //修改小白点方法 function changLi(num){ //遍历小白点数组 for(var x = 0;x<4;x++){ //把所有的点修改成蓝色 groundUl.children[x].style.backgroundColor = "#2196f3"; } //把相对应的小白点修改成红色 groundUl.children[num].style.backgroundColor = "red"; } } </script>
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