js原生多功能可定制滑块特效插件（keen slider）

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keen slider是一款多功能的、原生js滑块插件，可以在有触控和拖动事件的任何元素之间进行切换。

功能：

• 内容延迟加载

• 可选的分页和导航控件

• 就像一个无限的旋转木马。

• 同一个页面可以添加多个幻灯片

• 切换后自动获取到下一张/上一张幻灯片。

• 水平和垂直两个模式

• 自适应设计

• 支持Vanilla，Vue，Angular，JavaScript

• 功能强大但易于实现

安装和下载：

# NPM
$ npm install keen-slider --save

1.将keen滑块作为模块导入。

import 'keen-slider/keen-slider.min.css'
import KeenSlider from 'keen-slider'

2.或者从CDN加载JavaScript和CSS文件。

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/keen-slider/keen-slider.min.css" />
<script src="https://cdn.jsdelivr.net/npm/keen-slider/keen-slider.min.js"></script>

3.创建一个KeenSlider实例。

var slider1 = new KeenSlider("#slider1");

4.添加幻灯片。

<div id="slider1" class="keen-slider">
  <div class="keen-slider__slide">Slide 1</div>
  <div class="keen-slider__slide">Slide 2</div>
  <div class="keen-slider__slide">Slide 3</div>
  <div class="keen-slider__slide">Slide 4</div>
  <div class="keen-slider__slide">Slide 5</div>
  ...
</div>

5.通过将以下options对象作为第二个参数传递给KeenSlider方法

var slider1 = new KeenSlider("#slider1",{

    // auto set the slider to the height of the tallest slide
    autoHeight: true,

    // auto center the current slide
    centered: false,

    // pass options for different screen size
    // e.g.
    //   breakpoints: {
    //    '(min-width: 720px) and (max-width: 1000px)': {
    //       options here
    //     },
    //   }
    breakpoints: null,

    // enable mouse drag and touch swipe events
    controls: true,

    // adjust the speed that is translated to the slider when dragging
    dragSpeed: 1,

    // friction factor
    friction: 0.0025,

    // enable infinite loop
    loop: false,

    // initial slide
    initial: 0,

    // duration of the animation
    duration: 500,

    // slide selector
    slides: '.keen-slider__slide',

    // enable vertical mode
    vertical: false,

    // reset the slider on window resize
    resetSlide: false,

    // how many slides per view
    slidesPerView: 1,

    // space between slides
    spacing: 0,

    // "snap": auto snap to the next/prev slide
    // "free-snap": free mode + auto snap
    // "free": free mode
    mode: 'snap',

    // simulate rubberband if moving or dragging above the slider edge
    rubberband: true
    
});

6.API方法

// go to the next slide
slider1.next();

// back to the previous slide
slider1.prev();

// go to a specific slide
slider1.moveToSlide (slide);

// go to a relative slide
slider1.moveToSlideRelative(slide, nearest, duration);

// enable/disable touch & drag events
slider1.controls();

// refresh the slider
slider1.refresh(options);

// re-init the slider
slider1.Reinitialize();

// re-calc the width/height of the slider
// useful when new items are added to the slider
slider1.resize();

// destroy the slider instance
slider1.destroy();

// return the details of the slider.
slider1.details();

7.事件处理程序。

var slider1 = new KeenSlider("#slider1",{
    created: slider => {
      // do something
    },
    mounted: slider => {
      // do something
    },
    beforeChange: slider => {
      // do something
    },
    afterChange: slider => {
      // do something
    },
    slideChanged: slider => {
      // do something
    },
    dragStart: slider => {
      // do something
    },
    dragEnd: slider => {
      // do something
    },
    move: slider => {
      // do something
    },
    destroyed: slider => {
      // do something
    },
});

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