公司主要客戶是外國人,主要交流語言是英語,公司裏的人都使用一口流利的中國式英語進行對話,中國式英語在不正式場合沒什麼問題,大家都聽得懂即可。可惜,我不會,所以接下來得好好練習英語口語了。相信我能夠堅持下來,起碼把中國式英語學會。
以前都是jQuery或者zepto(移動端)佈局完事,後來公司要求pc端移動端兼容,然後想到bootstrap,當然,公司項目很小,小外包公司嘛。所以瀏覽器兼容跟隨bootstrap新版本走,不支持css3的全部沒戲。
軟件行業都有外包公司技術深度不夠(就是菜)說法,作爲小外包公司,深有體會。但我想改變現狀,所以打起源碼主意,其實研究好的源碼,會學到很多知識。
今天來研究下 carousel.js輪播插件源碼,依然會是簡單的源碼解讀,大神繞道。
/* ========================================================================
* Bootstrap: carousel.js v3.3.7
* http://getbootstrap.com/javascript/#carousel
* ========================================================================
* Copyright 2011-2016 Twitter, Inc.
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
* ======================================================================== */
+function ($) {
'use strict';//嚴格模式,能夠限制一些js代碼弊端,糟粕,爲新js標準鋪路
// CAROUSEL CLASS DEFINITION
// =========================
//Carousel類構造函數
var Carousel = function (element, options) {
this.$element = $(element)//選擇Dom元素
this.$indicators = this.$element.find('.carousel-indicators')//找到含有carousel-indicators類名的元素(輪播切換下標)
this.options = options//選項
this.paused = null //暫停切換
this.sliding = null //滑動
this.interval = null //每個輪播圖切換時間間隔
this.$active = null //活動圖片標示(展示那張輪播圖)
this.$items = null //圖片數量
this.options.keyboard && this.$element.on('keydown.bs.carousel', $.proxy(this.keydown, this))
this.options.pause == 'hover' && !('ontouchstart' in document.documentElement) && this.$element
.on('mouseenter.bs.carousel', $.proxy(this.pause, this))
.on('mouseleave.bs.carousel', $.proxy(this.cycle, this))
}
Carousel.VERSION = '3.3.7'//Carousel插件版本號,跟隨bootstrap版本號
Carousel.TRANSITION_DURATION = 600 //圖片過渡時間600ms
//插件默認圖片切換時間5000ms,鼠標經過暫停,連續播放,按鍵(鼠標左鍵)控制true
Carousel.DEFAULTS = {
interval: 5000,
pause: 'hover',
wrap: true,
keyboard: true
}
//左右按鍵切換輪播圖
Carousel.prototype.keydown = function (e) {
//正則驗證事件目標名字是否含有input或者textarea(忽略大小寫)有就返回
//也就是說鼠標要點擊到左右切換按鈕(a標籤)才能夠使用左右按鍵控制切換,點擊輪播圖,input控件,文本區域都不行
if (/input|textarea/i.test(e.target.tagName)) return
switch (e.which) {
case 37: this.prev(); break
case 39: this.next(); break
default: return
}
//阻止事件冒泡
e.preventDefault()
}
//輪播圖循環播放控制
Carousel.prototype.cycle = function (e) {
e || (this.paused = false) //類似於if(e||(this.paused = false)){}
this.interval && clearInterval(this.interval)//如果this.interval爲true,則清空計時器
//if(this.options.interval&&!this.paused){this.interval = setInterval($.proxy(this.next, this), this.options.interval)}
//bootstrap插件中用來代替if else慣用技巧
this.options.interval
&& !this.paused
&& (this.interval = setInterval($.proxy(this.next, this), this.options.interval))
return this //返回this
}
//得到當前活躍的圖片下標
Carousel.prototype.getItemIndex = function (item) {
this.$items = item.parent().children('.item')
return this.$items.index(item || this.$active)
}
//滑動方向控制
Carousel.prototype.getItemForDirection = function (direction, active) {
var activeIndex = this.getItemIndex(active)
var willWrap = (direction == 'prev' && activeIndex === 0)
|| (direction == 'next' && activeIndex == (this.$items.length - 1))
if (willWrap && !this.options.wrap) return active
var delta = direction == 'prev' ? -1 : 1
var itemIndex = (activeIndex + delta) % this.$items.length
return this.$items.eq(itemIndex)
}
//切換到目標圖片
Carousel.prototype.to = function (pos) {
var that = this
var activeIndex = this.getItemIndex(this.$active = this.$element.find('.item.active'))
if (pos > (this.$items.length - 1) || pos < 0) return
if (this.sliding) return this.$element.one('slid.bs.carousel', function () { that.to(pos) }) // yes, "slid"
if (activeIndex == pos) return this.pause().cycle()
return this.slide(pos > activeIndex ? 'next' : 'prev', this.$items.eq(pos))
}
//暫停滑動
Carousel.prototype.pause = function (e) {
e || (this.paused = true)
if (this.$element.find('.next, .prev').length && $.support.transition) {
this.$element.trigger($.support.transition.end)
this.cycle(true)
}
this.interval = clearInterval(this.interval)
return this
}
//下一張圖片
Carousel.prototype.next = function () {
if (this.sliding) return
return this.slide('next')
}
//上一張圖片
Carousel.prototype.prev = function () {
if (this.sliding) return
return this.slide('prev')
}
//輪播切換具體實現,添加active 下一張圖片滑動方向,鼠標暫停等等
Carousel.prototype.slide = function (type, next) {
var $active = this.$element.find('.item.active')
var $next = next || this.getItemForDirection(type, $active)
var isCycling = this.interval
var direction = type == 'next' ? 'left' : 'right'
var that = this
if ($next.hasClass('active')) return (this.sliding = false)
var relatedTarget = $next[0]
var slideEvent = $.Event('slide.bs.carousel', {
relatedTarget: relatedTarget,
direction: direction
})
this.$element.trigger(slideEvent)
if (slideEvent.isDefaultPrevented()) return
this.sliding = true
isCycling && this.pause()
if (this.$indicators.length) {
this.$indicators.find('.active').removeClass('active')
var $nextIndicator = $(this.$indicators.children()[this.getItemIndex($next)])
$nextIndicator && $nextIndicator.addClass('active')
}
var slidEvent = $.Event('slid.bs.carousel', { relatedTarget: relatedTarget, direction: direction }) // yes, "slid"
if ($.support.transition && this.$element.hasClass('slide')) {
$next.addClass(type)
$next[0].offsetWidth // force reflow
$active.addClass(direction)
$next.addClass(direction)
$active
.one('bsTransitionEnd', function () {
$next.removeClass([type, direction].join(' ')).addClass('active')
$active.removeClass(['active', direction].join(' '))
that.sliding = false
setTimeout(function () {
that.$element.trigger(slidEvent)
}, 0)
})
.emulateTransitionEnd(Carousel.TRANSITION_DURATION)
} else {
$active.removeClass('active')
$next.addClass('active')
this.sliding = false
this.$element.trigger(slidEvent)
}
isCycling && this.cycle()
return this
}
// CAROUSEL PLUGIN DEFINITION
// ==========================
//Carousel插件定義
function Plugin(option) {
return this.each(function () {
var $this = $(this)
var data = $this.data('bs.carousel')
var options = $.extend({}, Carousel.DEFAULTS, $this.data(), typeof option == 'object' && option)
var action = typeof option == 'string' ? option : options.slide
if (!data) $this.data('bs.carousel', (data = new Carousel(this, options)))
if (typeof option == 'number') data.to(option)
else if (action) data[action]()
else if (options.interval) data.pause().cycle()
})
}
var old = $.fn.carousel
$.fn.carousel = Plugin
$.fn.carousel.Constructor = Carousel
// CAROUSEL NO CONFLICT
// ====================
//防止衝突noConflict,目的是釋放$控制權
$.fn.carousel.noConflict = function () {
$.fn.carousel = old
return this
}
// CAROUSEL DATA-API
// =================
//點擊句柄綁定
var clickHandler = function (e) {
var href
var $this = $(this)
var $target = $($this.attr('data-target') || (href = $this.attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '')) // strip for ie7
if (!$target.hasClass('carousel')) return
var options = $.extend({}, $target.data(), $this.data())
var slideIndex = $this.attr('data-slide-to')
if (slideIndex) options.interval = false
Plugin.call($target, options)
if (slideIndex) {
$target.data('bs.carousel').to(slideIndex)
}
e.preventDefault()
}
$(document)
.on('click.bs.carousel.data-api', '[data-slide]', clickHandler)
.on('click.bs.carousel.data-api', '[data-slide-to]', clickHandler)
$(window).on('load', function () {
$('[data-ride="carousel"]').each(function () {
var $carousel = $(this)
Plugin.call($carousel, $carousel.data())
})
})
}(jQuery);
由於時間以及個人技術問題,有些具體的來不及寫註釋,放到有空再來修改編輯了。目前先這樣,晚安!