function slide() {
var bannerImgs = document.querySelector(".banner_imgs");
var Indexs = document.querySelectorAll(".banner_index li");
var imgLis = document.querySelectorAll(".banner_imgs li");
//螢幕寬度
var screenWidth = document.body.offsetWidth;
var index = 1;
//預設顯示的應該是第二張圖檔
bannerImgs.style.transform = "translateX(" + screenWidth index -1 + "px)";
//添加過渡效果
function setTransition() {
bannerImgs.style.webkitTransition = "all .2s";
bannerImgs.style.transition = "all .2s";
}
//清除過渡效果
function clearTransition() {
bannerImgs.style.webkitTransition = "none";
bannerImgs.style.transition = "none";
}
//設定移動距離
function setTranslateX(distance) {
bannerImgs.style.webkitTransform = "translateX(" + distance + "px)";
bannerImgs.style.transform = "translateX(" + distance + "px)";
}
//控制小圓點
function setPoint() {
for (var i = 0; i < Indexs.length; i++) {
Indexs[i].className = "";
}
Indexs[index - 1].className = "current";
}
//設定定時器
var timer = setInterval(function() {
index++;
setTransition();
setTranslateX(screenWidth index -1);
},1000);
//添加過渡動畫結束事件
bannerImgs.addEventListener("transitionend",function() {
if (index > 8) {
index = 1;
} else if (index < 1) {
index = 8;
}
clearTransition();
setTranslateX(screenWidth index -1);
setPoint();
})
//添加touch事件
var startX = 0;
var moveX = 0;
var isMove = false;
bannerImgs.addEventListener("touchstart",function(event) {
isMove = false;
clearInterval(timer);
startX = event.touches[0].clientX;
})
bannerImgs.addEventListener("touchmove",function(event) {
isMove = true;
moveX = event.touches[0].clientX - startX;
setTranslateX(moveX + index screenWidth -1);
})
bannerImgs.addEventListener("touchend",function(event) {
if(isMove && Math.abs(moveX) > screenWidth/3){
if (moveX < 0) {
index++;
} else if (moveX > 0) {
index--;
}
}
setTransition();
setTranslateX(index screenWidth -1);
timer = setInterval(function() {
index++;
setTransition();
setTranslateX(screenWidth index -1);
},1000);
})
}