轮播图_transform 版本
- 关键点：
- 2D 变换 transform 不会改变 元素 在 文档流 中的位置
- 定位 position 会改变 元素 在 文档流 中的位置
- 语句解析太快，使用 setTimeoout(); 等待渲染 不能超过 20ms
- touchstart 实现 无缝滑屏：
创建两组图片，ulList.innerHTML = ulList.innerHTML;
1. 触屏时，如果是第一组的第一张图片，则瞬间切换到第二组的第一张图片；
2. 触屏时，如果是第二组的最后一张图片，则瞬间切换到第一组的最后一张。
- transform 读写二合一
关键点：
arguments 参数列表，类数组对象，调用函数时系统隐式传递的一个实参
function transformEle(ele, attr, val){
if(!ele.transform){
ele.transform = {};
}; var result = "";
if(arguments.length > 2){
// 写入操作
ele.transform[attr] = val; for( var attrStr in ele.transform){
switch(attrStr){
case "translate":
case "translateX":
case "translateY":
case "translateZ":{
result += attrStr+"("+ele.transform[attrStr]+"px) ";
break;
}; case "rotate":
case "rotateX":
case "rotateY":
case "rotateZ":
case "skew":
case "skewX":
case "skewY":{
result += attrStr+"("+ele.transform[attrStr]+"deg) ";
break;
}; case "scale":
case "scaleX":
case "scaleY":{
result += attrStr+"("+ele.transform[attrStr]+") ";
break;
};
};
}; ele.style.transform = result;
}else{
// 读取操作
if(ele.transform[attr]){
result = ele.transform[attr];
}else{
if(attr == 'scale' || attr == 'scaleX' || attr == 'scaleY'){
result = 1;
}else{
result = 0;
};
}
}; return result;
};
- 移动端 无缝滑屏
- 自动轮播 与 无缝滑屏的冲突
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes" />
<title>无缝轮播</title> <style type="text/css">
* {
padding: 0;
margin: 0;
} a {
text-decoration: none;
} ul,
ol {
list-style: none;
} input {
outline: none;
} img {
display: block;
} html,
body {
height: 100%;
overflow: hidden;
} #wrap {
width: 100%;
height: 100%; background-color: #96b377;
} /**** ****/
#wrap {
position: relative;
} #ul_list {
overflow: hidden;
width: 1000%;
} #wrap #ul_list>li {
float: left;
} #wrap #ul_list>li>a>img{
width: 100%;
} /**** 小圆点 ****/
#ol_list {
position: absolute;
bottom: 10px;
right: 10px;
width: 75px;
display: flex;
justify-content: space-between;
} #ol_list li {
width: 10px;
height: 10px;
border-radius: 50%;
background-color: gray;
} #ol_list li.active {
background-color: deeppink;
}
</style>
</head> <body> <!-- 模拟手机屏幕 -->
<section id="wrap">
<ul id="ul_list">
<li>
<a href="javascript:;"><img src="./img/Deadpool.jpg"/></a>
</li> <li>
<a href="javascript:;"><img src="./img/Groot.jpg"/></a>
</li> <li>
<a href="javascript:;"><img src="./img/Hock.jpg"/></a>
</li> <li>
<a href="javascript:;"><img src="./img/RocketRaccoon.jpg"/></a>
</li> <li>
<a href="javascript:;"><img src="./img/SpiderMan.jpg"/></a>
</li>
</ul> <ol id="ol_list">
<li data-pindex="0" class="active"></li>
<li data-pindex="1"></li>
<li data-pindex="2"></li>
<li data-pindex="3"></li>
<li data-pindex="4"></li>
</ol>
</section> <!-- javascript 代码 -->
<script type="text/javascript">
// 取消默认行为
document.addEventListener("touchstart", function(e){
e.preventDefault();
}, false); // 点透处理 var clientWidth = document.documentElement.clientWidth;
// 适配
(function(){ /* 1. 创建 style 标签 */
var styleNode = document.createElement("style"); /* 2. 给 style 标签添加内容 (屏幕分份, 大多数公司 16 份) */
styleNode.innerHTML = "html {"+
"font-size:"+clientWidth/16+"px !important"+
"}"; /* IPhone 6 的 font-size: 23.4375px */ /* 3. 把 style 标签追加到 head 标签里 */
document.head.appendChild(styleNode);
}()); var wrap = document.getElementById("wrap");
var ulList = document.getElementById("ul_list");
var olList = document.getElementById("ol_list"); // 克隆第二组图片
ulList.innerHTML += ulList.innerHTML;
var lis = document.querySelectorAll("#ul_list>li");
var points = document.querySelectorAll("#ol_list>li"); window.onload = function(){
var styleNode = document.createElement("style");
styleNode.innerHTML = "#ul_list {width:"+lis.length+"00%;}";
styleNode.innerHTML += "#ul_list>li {width:"+100/lis.length+"%;}";
document.head.appendChild(styleNode); styleNode.innerHTML += "#wrap {height:"+lis[0].offsetHeight+"px;}";
}; // 动态添加属性
ulList.oldUlX = 0;
ulList.oldTouchX = 0;
ulList.curIndex = 0;
wrap.addEventListener("touchstart", function(e){
window.clearInterval(ulList.autoTimer);
var touch = e.changedTouches; // 无缝轮播
if(ulList.curIndex == 0){
ulList.curIndex = lis.length/2;
}else if(ulList.curIndex == lis.length-1){
ulList.curIndex = lis.length/2-1;
}
transformEle(ulList, "translateX", -ulList.curIndex*clientWidth); ulList.oldTouchX = touch[0].clientX;
ulList.oldUlX = transformEle(ulList, "translateX");
ulList.style.transition = "0s all ease 0s";
},false); wrap.addEventListener("touchmove", function(e){
var touch = e.changedTouches; var newTouchX = touch[0].clientX;
transformEle(ulList, "translateX", ulList.oldUlX+(newTouchX - ulList.oldTouchX) );
},false); wrap.addEventListener("touchend", function(){
ulList.curIndex = Math.round(-transformEle(ulList, "translateX")/clientWidth);
ulList.style.transition = "1s all ease 0s"; transformEle(ulList, "translateX", -ulList.curIndex*clientWidth); for(var i=0; i<points.length; i++){
points[i].className = "";
};
points[ulList.curIndex%5].className = "active";
ulList.autoRun();
},false); olList.addEventListener("touchstart", function(e){
window.clearInterval(ulList.autoTimer);
touch = e.changedTouches;
e.stopPropagation();
ele = touch[0].target;
if(ele.nodeName == "LI"){
for(var i=0; i<points.length; i++){
points[i].className = "";
};
ele.className = "active"; ulList.curIndex = +ele.dataset.pindex;
transformEle(ulList, "translateX", -ulList.curIndex*clientWidth);
ulList.autoRun();
};
}, false); // 自动轮播
ulList.autoRun = function(){
window.clearInterval(ulList.autoTimer);
ulList.autoTimer = window.setInterval(function(){
// 无缝轮播
if(ulList.curIndex == lis.length-1){
ulList.curIndex = lis.length/2-1;
ulList.style.transition = "0s none";
transformEle(ulList, "translateX", -ulList.curIndex*clientWidth);
} ulList.curIndex++;
window.setTimeout(function(){
ulList.style.transition = "1s all ease 0s";
transformEle(ulList, "translateX", -ulList.curIndex*clientWidth);
}, 50); for(var i=0; i<points.length; i++){
points[i].className = "";
};
points[ulList.curIndex%5].className = "active";
}, 2500-50);
}; ulList.autoRun(); // 读写 transform 二合一
function transformEle(ele, attr, val){
if(!ele.transform){
ele.transform = {};
}; var result = "";
if(arguments.length > 2){
// 写入操作
ele.transform[attr] = val; for( var attrStr in ele.transform){
switch(attrStr){
case "translate":
case "translateX":
case "translateY":
case "translateZ":{
result += attrStr+"("+ele.transform[attrStr]+"px) ";
break;
}; case "rotate":
case "rotateX":
case "rotateY":
case "rotateZ":
case "skew":
case "skewX":
case "skewY":{
result += attrStr+"("+ele.transform[attrStr]+"deg) ";
break;
}; case "scale":
case "scaleX":
case "scaleY":{
result += attrStr+"("+ele.transform[attrStr]+") ";
break;
};
};
}; ele.style.transform = result;
}else{
// 读取操作
if(ele.transform[attr]){
result = ele.transform[attr];
}else{
if(attr == 'scale' || attr == 'scaleX' || attr == 'scaleY'){
result = 1;
}else{
result = 0;
};
}
}; return result;
};
</script>
</body>
</html>