JS Zepto jQuery for mobile
Zepto
github地址: https://github.com/madrobby/zepto
官方地址: http://zeptojs.com/
中文版地址: http://www.css88.com/doc/zeptojs_api/
Zepto就是jQuery的移动端版本, 可以看做是一个轻量级的jQuery
注意点
Zepto的设计目的是提供 jQuery 的类似的API，但并不是100%覆盖 jQuery
jQuery的底层是通过DOM来实现效果的， zepto.js 是用css3 来实现的；
官网下载的zepto,就已经包含了官网所述的默认模块了
github上下载的zepto模块需要自己导入
<!--<!–引入核心模块；包含许多jQuery中常见方法–>--> <script src="js/zepto.js"></script> <!--<!–引入zepto事件模块, 包含了常见的事件方法on/off/click ...–>--> <script src="js/event.js"></script> <!--<!–引入zepto动画模块,–>--> <script src="js/fx.js"></script> <!--<!–引入zepto动画模块的常用方法,–>--> <script src="js/fx_methods.js"></script>
Zepto点击事件
由于移动端的手势多而且分单击双击,所以移动端的click事件有300ms左右的延迟,所以移动端的点击事件用tab
$("div").tap(function(){
......
})zepto中touch相关事件
touchstart
touchstart是手指刚触摸到元素时触发的事件
touchmove
touchmove是手指移动时触发的事件
touchend
当手指离开指定元素时触发
注意点
添加以上三个事件的时候用addEventListener
以上三个事件对pc端无效
zepto中touch事件的对象
touches:
保存了屏幕上所有手指的列表
targetTouches
保存了元素上所有手指的列表
changedTouches
包含了刚刚与屏幕接触的手指或者刚刚离开屏幕的手指
TouchEvent {isTrusted: true, touches: TouchList, targetTouches: TouchList, changedTouches: TouchList}zepto中touch事件的XY
client: 可视区域
page: 内容
var oDiv = document.querySelector("div");
/*
1.注意点:
无论是event对象中的touches/targetTouches/changedTouches都是一个伪数组
所以我们想要获取手指位置的时候, 需要从伪数组中取出需要获取的那个手指对象
*/
oDiv.addEventListener("touchstart", function (event) {
// 获取手指距离屏幕左上角的位置
// console.log(event.targetTouches[0].screenX);
// console.log(event.targetTouches[0].screenY);
// 获取相对于当前视口的距离
console.log("clientX", event.targetTouches[0].clientX);
console.log("clientY", event.targetTouches[0].clientY);
/*
clientX 10
clientY 8
pageX 1156
pageY 8
*/
// 获取相对于当前页面内容的距离
console.log("pageX", event.targetTouches[0].pageX);
console.log("pageY", event.targetTouches[0].pageY);
});简单案例: 物块拖拽
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>08-touch事件练习</title>
<style>
*{
margin: 0;
padding: 0;
}
div{
width: 100px;
height: 100px;
background: red;
}
</style>
</head>
<body>
<div></div>
<script>
var oDiv = document.querySelector("div");
var startX, startY, moveX, moveY;
// 1.监听手指按下事件
oDiv.addEventListener("touchstart", function (event) {
// 记录手指按下的位置
startX = event.targetTouches[0].clientX;
startY = event.targetTouches[0].clientY;
});
// 2.监听手指一动事件
oDiv.addEventListener("touchmove", function (event) {
// 记录手指移动之后的位置
moveX = event.targetTouches[0].clientX;
moveY = event.targetTouches[0].clientY;
// 计算两个位置之间相差的距离, 相差的距离就是需要移动的距离
var offsetX = moveX - startX;
var offsetY = moveY- startY;
// 让div移动起来
oDiv.style.transform = "translate("+offsetX+"px,"+offsetY+"px)";
});
</script>
</body>
</html>zepto中touch事件的点透问题
如果两个元素是重叠的(一个在另一个上面), 并且上面一个监听了touchstart事件, 下面一个监听了click事件,那么如果上面一个元素触发touchstart事件之后消失了, 那么就会出现点透问题
解决方案: fastclick框架
注: 框架必须在前面调用, 并且所有的元素都被注册了fastclick中的事件, 以后所有的click事件都是fastclick的click事件
zepto中的swipe事件
手指在元素上滑动触发的事件
$("div").swipeLeft(function () {
// console.log("左滑动");
$(this).animate({left: "0px"}, 1000);
});
$("div").swipeRight(function () {
// console.log("右滑动");
$(this).animate({left: "100px"}, 1000);
});
$("div").swipeUp(function () {
// console.log("上滑动");
$(this).animate({top: "0px"}, 1000);
});
$("div").swipeDown(function () {
// console.log("下滑动");
$(this).animate({top: "100px"}, 1000);移动端hover事件
移动端只能使用mouseenter和mouseleave来监听移入和移出
iscroll框架
当我们做移动端侧边栏的时候, 自己实现可能会出现bug也可能比较麻烦,这时候可以用iscroll框架
github地址: https://github.com/cubiq/iscroll
实现步骤
按照框架的需要搭建一个三层的结构
引入iscroll.js框架
创建一个IScroll对象, 把需要滚动的容器给它
var myScroll = new IScroll('.test', {
mouseWheel: true, // 开启鼠标滚动滚动
scrollbars: true // 开启滚动条, 但是容器必须是定位的, 否则滚动条的位置不对
});
// 相关常用的回调函数
myScroll.on("beforeScrollStart", function () {
console.log("手指触摸, 还没有开始滚动");
});
myScroll.on("scrollStart", function () {
console.log("开始滚动");
});
myScroll.on("scrollEnd", function () {
console.log("结束滚动");
});swiper框架
Swiper是纯javascript打造的滑动特效插件，面向手机、平板电脑等移动终端。
Swiper能实现触屏焦点图、触屏Tab切换、触屏多图切换等常用效果。
Swiper开源、免费、稳定、使用简单、功能强大，是架构移动终端网站的重要选择！
如何使用:
引入对应的css和js文件
按照框架的需求搭建三层结构
创建一个Swiper对象, 将容器元素传递给它,第二个参数接收一个对象
<div>
<ul>
<li>slider1</li>
<li>slider2</li>
<li>slider3</li>
</ul>
</div>
<script>
var mySwiper = new Swiper('.test',{
loop: true,
autoplay: true,
// 如果需要分页器
pagination: {
el: '.swiper-pagination',
},
// 如果需要前进后退按钮
navigation: {
nextEl: '.swiper-button-next',
prevEl: '.swiper-button-prev',
},
// 如果需要滚动条
scrollbar: {
el: '.swiper-scrollbar',
},);
</script>推荐教程：《JS教程》
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