JS实现滑动插件

本文实例为大家分享了JS实现滑动插件的具体代码，供大家参考，具体内容如下基本思路是

本文实例为大家分享了JS实现滑动插件的具体代码，供大家参考，具体内容如下

基本思路是封装一个Slider类， 拥有默认初始配置参数。 Slider.prototype(原型链上)拥有实现滑动的方法，通过监听手势，实现滑动的效果。 比较复杂的滑动效果， 可以使用Swiper.js 来实现。

/* PollyFill for iOS 5.* */
if (!Function.prototype.bind) {
 Function.prototype.bind = function (oThis) {
 var args = Array.prototype.slice.call(arguments, 1)
 var f2bind = this
 var fnop = function () {}
 var bound = function () {
 return f2bind.apply(this instanceof fnop && oThis
 ? this
 : oThis,
 args.concat(Array.prototype.slice.call(arguments)))
 }
 fnop.prototype = this.prototype
 bound.prototype = new fnop()
 return bound
 }
}

// 添加浏览器前缀
function prefix(style) {
 var vendor = (function() {
 var transArr = ['transform', 'webkitTransform', 'MozTransform', 'msTranform', 'OTransform'],
 vendors = ['', 'webkit', 'Moz', 'ms', 'O'],
 elementStyle = document.createElement('div').style

 for (var i = 0; i < vendors.length; i++) {
 if (transArr[i] in elementStyle) {
 return vendors[i]
 }
 }

 return false
 })()

 if (vendor === false) return false
 if (vendor === '') return style
 return vendor + style.charAt(0).toUpperCase() + style.substr(1)
}

var TRANSFORM = prefix('transform'),
 TRANSITION = prefix('transition')

var Slider = function(options) {
 // 初始化配置参数
 this.options = $.extend({
 slideWrap: '.pages', // 容器
 slideItem: '.page', // 滑动单元的元素
 direction: 'Y', // 滑动的方向
 effect: 'slide', // 滑动的效果
 triggleDist: 100, // 触发滑动的手指移动最小位移
 followFinger: true, // 是否跟随手指移动
 duration: .4, // 翻页的延时
 currentIdx: 0 // 初始显示的页码
 }, options)

 var EffectDict = {
 'slide' : ['slide', 'slide'],
 'scale' : ['slide', 'scale']
 }

 this.pagesWrap = document.querySelector(this.options.slideWrap)
 this.pages = document.querySelectorAll(this.options.slideItem)

 this.hook = this.options.slideController
 this._total = this.pages.length
 this._pageX = 0
 this._pageY = 0
 this._distance = 0 // 页面之间切换的距离
 this._moveDist = 0 // touch 滑动的距离
 this._supportTouch = 'ontouchend' in window
 this._touching = false

 this._enter = this[EffectDict[this.options.effect][0]].bind(this)
 this._leave = this[EffectDict[this.options.effect][1]].bind(this)

 this._init()
 this._bindEvents()
}
Slider.prototype = {
 _init: function() {
 var width = this.pagesWrap.clientWidth,
 height = this.pagesWrap.clientHeight,
 currentIdx = this.options.currentIdx,
 pages = this.pages,
 total = this._total,
 distance = this._distance = (this.options.direction == 'Y' ? height : width)

 // 初始化各个 page 的位置
 for (var i = 0; i < this._total; i++) {
 if (i == currentIdx) {
 pages[i].classList.add('current')
 } else {
 this._enter(pages[i], i < currentIdx ? -distance : distance, 2)
 }
 }
 },

 _bindEvents: function() {
 var _this = this,
 pagesWrap = this.pagesWrap

 var events = this._supportTouch ? 'touchstart touchmove touchend touchcancel' : 'mousedown mousemove mouseup mousecancel'

 events.split(' ').forEach(function(e) {
 pagesWrap.addEventListener(e, _this)
 })

 window.addEventListener('orientationchange', this)
 window.addEventListener('resize', this)
 },

 handleEvent: function(e) {
 switch (e.type) {
 case 'orientationchange':
 case 'resize':
 this._init()
 break
 case 'touchstart':
 case 'mousedown':
 this._start(e)
 break
 case 'touchmove':
 case 'mousemove':
 this._move(e)
 break
 case 'touchend':
 case 'touchcancel':
 case 'mouseup':
 case 'mousecancel':
 this._end(e)
 break
 }
 },

 _start: function(e) {
 if (this._touching) {
 e.preventDefault()
 e.stopPropagation()
 return
 }

 this._touching = true
 this._moveDist = 0

 var touches = (this._supportTouch ? e.touches[0] : e),
 distance = this._distance,
 enter = this._enter

 var $current = this.pages[this.options.currentIdx],
 $next = $current.nextElementSibling,
 $prev = $current.previousElementSibling

 this._pageX = touches.pageX
 this._pageY = touches.pageY

 $current.style.zIndex = 1

 if ($next) {
 $next.style.zIndex = 2
 enter($next, distance)
 }

 if ($prev) {
 $prev.style.zIndex = 2
 enter($prev, -distance)
 }
 },

 _move: function(e) {
 e.preventDefault()

 if (!this._touching) return

 var touches = (this._supportTouch ? e.touches[0] : e),
 direction = this.options.direction,
 distance = this._distance

 var currentIdx = this.options.currentIdx,
 $current = this.pages[this.options.currentIdx],
 $next = $current.nextElementSibling,
 $prev = $current.previousElementSibling,
 xDist = touches.pageX - this._pageX,
 yDist = touches.pageY - this._pageY,
 enter = this._enter,
 leave = this._leave,
 moveDist = this._moveDist = (direction == 'X' ? xDist : yDist)

 if (this.options.followFinger) {
 $next && enter($next, moveDist + distance)
 $prev && enter($prev, moveDist - distance)

 // 因为不能翻页，所以制造拖动困难的效果
 if ((currentIdx == 0 && moveDist > 0) || (currentIdx == this._total && moveDist < 0)) {
 return this.slide($current, moveDist / 4)
 }

 leave($current, moveDist)
 }
 },

 _end: function(e) {
 var move = this._moveDist,
 distance = this._distance,
 triggleDist = this.options.triggleDist,
 enter = this._enter,
 $current = this.pages[this.options.currentIdx],
 $next = $current.nextElementSibling,
 $prev = $current.previousElementSibling

 this._touching = false

 this._enter($current, 0)
 $next && enter($next, distance)
 $prev && enter($prev, -distance)

 if ($next && move < -triggleDist && this.hook.shouldGoToNext($current)) return this._next()
 if ($prev && move > triggleDist && this.hook.shouldGoToPrev($current)) return this._prev()
 },

 _next: function() {
 this.go2page(this.options.currentIdx + 1)
 },

 _prev: function() {
 this.go2page(this.options.currentIdx - 1)
 },

 go2page: function(idx) {

 var $current = this.pages[this.options.currentIdx],
 $target = this.pages[idx],
 enter = this._enter,
 leave = this._leave,
 distance = (idx < this.options.currentIdx ? this._distance : -this._distance)

 $($target).one('webkitTransitionEnd', function() {
 $current.classList.remove('current')
 $target.classList.add('current')
 this.hook.didGoToPage($target, $current)
 }.bind(this))

 leave($current, distance)
 enter($target, 0)

 this._moveDist = 0
 this.options.currentIdx = idx
 },


 /**
 * 切页的效果
 * 目前只支持两种效果：
 * 1. Slide（普通的滑动）
 * 2. Scale（缩放滑动）
 */
 slide: function(el, val, need) {
 need = need || 1
 el.style.webkitTransition = (need == 1) ? 'all 0.4s' : ''
 el.style[TRANSFORM] = 'translate3d(' + ('Y' == this.options.direction ? '0, ' + val + 'px' : (val + 'px, 0')) + ',0)'
 },

 scale: function(el, val) {
 el.style.webkitTransition = 'all 0.4s'
 el.style[TRANSFORM] = 'scale(' + (1 - Math.round(Math.abs(val) / this._distance / 4*100) / 100) + ') translateZ(0)'
 }
}

var slideController = {
 shouldGoToPrev: function(el) {
 return false;
 },
 shouldGoToNext: function(el) {
 return false;;
 },
 didGoToPage: function(el, prevEl) {
 return false;
 }
}


function query(selector){
 return document.querySelector(selector);
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。