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js如何实现滑动插件

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。

(推荐教程:javascript教程)

代码如下:

/* 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);}

更多炫酷javascript特效代码,尽在:javascript特效

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文章标题:js如何实现滑动插件

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