使用原生的javascript來實現(xiàn)輪播圖
下面看下js輪播圖的實現(xiàn)代碼,具體代碼如下所示:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> * { padding: 0; margin: 0; list-style: none; border: 0; } .all { width: 500px; height: 200px; padding: 7px; border: 1px solid #ccc; margin: 100px auto; position: relative; } .screen { width: 500px; height: 200px; overflow: hidden; position: relative; } .screen li { width: 500px; height: 200px; overflow: hidden; float: left; } .screen ul { position: absolute; left: 0; top: 0px; width: 3000px; } .all ol { position: absolute; right: 10px; bottom: 10px; line-height: 20px; text-align: center; } .all ol li { float: left; width: 20px; height: 20px; background: #fff; border: 1px solid #ccc; margin-left: 10px; cursor: pointer; } .all ol li.current { background: yellow; } #arr { display: none; } #arr span { width: 40px; height: 40px; position: absolute; left: 5px; top: 50%; margin-top: -20px; background: #000; cursor: pointer; line-height: 40px; text-align: center; font-weight: bold; font-family: '黑體'; font-size: 30px; color: #fff; opacity: 0.3; border: 1px solid #fff; } #arr #right { right: 5px; left: auto; } </style> </head> <body> <div class="all" id='box'> <div class="screen"> <ul> <li><img src="images/1.jpg" width="500" height="200"/></li> <li><img src="images/2.jpg" width="500" height="200"/></li> <li><img src="images/3.jpg" width="500" height="200"/></li> <li><img src="images/4.jpg" width="500" height="200"/></li> <li><img src="images/5.jpg" width="500" height="200"/></li> </ul> <ol> </ol> </div> <div id="arr"><span id="left"><</span><span id="right">></span></div> </div> <script> function $(element) { return document.getElementById(element); } var box = $("box"); var screen = box.children[0]; var ul = screen.children[0]; var ulLis = ul.children; var ol = screen.children[1]; var arr = $("arr"); var left = $("left"); var right = $("right"); //動態(tài)創(chuàng)建小圖標 for (var i = 0; i < ulLis.length; i++) { var li = document.createElement("li"); li.innerHTML = i + 1; ol.appendChild(li); } //設(shè)置這些個小圖標 var olLis = ol.children; var imgWidth = screen.offsetWidth; for (var j = 0; j < olLis.length; j++) { olLis[j].index = j; olLis[j].onmouseover = function () { //排他思想 for (var i = 0; i < olLis.length; i++) { olLis[i].className = ""; } this.className = "current"; var target = -imgWidth * this.index; cutton(ul, target, 20); //為了讓點擊事件和小面的小圖標能夠一一對應(yīng),設(shè)置他們的索引值相同 pic = square = this.index; } } //給小圖標設(shè)置一個初始樣式 ol.children[0].className = "current"; //給ul追加一張圖 ul.appendChild(ul.children[0].cloneNode(true)); //設(shè)置箭頭的顯示與隱藏 box.onmouseover = function () { arr.style.display = "block"; //鼠標放上去的時候,不再自動滾動 clearInterval(timer); } box.onmouseout = function () { arr.style.display = "none"; //鼠標離開的時候,繼續(xù)自動滾動 timer = setInterval(playNext, 1000); } //設(shè)置點擊左右小箭頭的事件且要求小圖標要跟著變化 //1.設(shè)置點擊右側(cè)箭頭 var pic = 0;//記錄當前為第幾項用 var square = 0;//記錄小圖標的索引值 /* right.onclick = function () {//存在的問題是當移動到最后一張的時候,無法跳轉(zhuǎn)到第一張 pic++; var target = -pic * imgWidth; cutton(ul, target, 20); }*/ //方法改進 /*right.onclick = function () { //先對pic做一個判斷,當pic的值為5的時候,實現(xiàn)一個跳轉(zhuǎn) if (pic == ulLis.length - 1) { ul.style.left = 0; pic = 0; } pic++; var target = -pic * imgWidth; cutton(ul, target, 20); if (square == olLis.length - 1) { square = -1;//下面會加一,就變成了0 } square++; //排他思想 for (var i = 0; i < olLis.length; i++) { olLis[i].className = ""; } olLis[square].className = "current"; }*/ //使用封裝函數(shù) right.onclick = function () { playNext(); } //2.設(shè)置點擊左側(cè)箭頭 left.onclick = function () {//要判斷一下當pic為零時的情況 if (pic == 0) { ul.style.left = -imgWidth * (ulLis.length - 1) + "px";//要記得加單位 pic = ulLis.length - 1;//給pic重新賦一個值 } pic--; var target = -pic * imgWidth; cutton(ul, target, 20); //設(shè)置小圖標樣式 if (square == 0) { square = olLis.length; } square--; for (var i = 0; i < olLis.length; i++) { olLis[i].className = ""; } olLis[square].className = "current"; } //設(shè)置自動滾動 //1.封裝點擊右側(cè)小箭頭事件 function playNext() { //先對pic做一個判斷,當pic的值為5的時候,實現(xiàn)一個跳轉(zhuǎn) if (pic == ulLis.length - 1) { ul.style.left = 0; pic = 0; } pic++; var target = -pic * imgWidth; cutton(ul, target, 20); if (square == olLis.length - 1) { square = -1;//下面會加一,就變成了0 } square++; //排他思想 for (var i = 0; i < olLis.length; i++) { olLis[i].className = ""; } olLis[square].className = "current"; } //2.調(diào)用這個封裝的函數(shù),并且設(shè)置一個間歇性計時器 var timer = null; timer = setInterval(playNext, 1000); //封裝函數(shù) function cutton(obj, target, stp) { clearInterval(obj.timer); obj.timer = setInterval(function () { var step = stp; step = obj.offsetLeft > target ? -step : step; if (Math.abs(obj.offsetLeft - target) >= Math.abs(step)) { obj.style.left = obj.offsetLeft + step + "px"; } else { obj.style.left = target + "px"; clearInterval(obj.timer); } }, 15) } </script> </body> </html>
補充:原生javascript實現(xiàn)banner圖自動輪播切換
一般在做banner輪播圖的時候都是用jquery,因為代碼少,方便,不需要花費很長的時間去獲取某個元素作為變量,然后再進行操作,只要一個$就搞定了。但是今天我用原生的javascript做了一下這個輪播效果,感覺還行,以下是部分js源代碼,僅供參考!文章底部查看效果演示。
1、鼠標離開banner圖,每隔2s切換一次;
2、鼠標滑過下方的小按鈕,可以切換圖片;
3、鼠標點擊左右按鈕,可以切換圖片。
var oPic,oLi,anniu,aLi,aLength,num,timer,oG,_index,oSpan; window.onload = function(){ oPic = document.getElementsByClassName("pic")[0]; oLi = oPic.getElementsByTagName("li"); anniu = document.getElementsByClassName("anniu")[0]; aLi = anniu.getElementsByTagName("li"); aLength = aLi.length; num = 0; oG = document.getElementsByClassName("g")[0]; oSpan = oG.getElementsByTagName("span"); oLeft = oSpan[0]; oRight = oSpan[1]; start(); oG.onmouseover = end; oG.onmouseout = start; for(var j=0; j<aLength; j++){ aLi[j].index = j; aLi[j].onmouseover = change; } oRight.onclick = time; oLeft.onclick = times; } //自動輪播開始或結(jié)束 function start(){ timer = setInterval(time,2000); hide(); } function end(){ clearInterval(timer); show(); } //圖片切換++ function time(){ for(var i=0; i<aLength; i++){ oLi[i].style.display = "none"; aLi[i].className = ""; } num++; num = num % 4; oLi[num].style.display = "block"; aLi[num].className = "on"; } //圖片切換-- function times(){ for(var i=0; i<aLength; i++){ oLi[i].style.display = "none"; aLi[i].className = ""; } num--; num = (num+4)%4; oLi[num].style.display = "block"; aLi[num].className = "on"; } //鼠標滑過按鈕,圖片輪播 function change(){ _index = this.index; for(var k=0; k<aLength; k++){ aLi[k].className = ""; oLi[k].style.display = "none"; } aLi[_index].className = "on"; oLi[_index].style.display = "block"; } //左右按鈕顯示或隱藏 function show(){ oSpan[0].style.display = "block"; oSpan[1].style.display = "block"; } function hide(){ oSpan[0].style.display = "none"; oSpan[1].style.display = "none"; }
以上所述是小編給大家介紹的使用原生的javascript來實現(xiàn)輪播圖,希望對大家有所幫助,如果大家有任何疑問請給我留言,小編會及時回復(fù)大家的。在此也非常感謝大家對腳本之家網(wǎng)站的支持!
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