Xuanmo Blog

前言

在平时写特效的时候，喜欢把一些东西封装成一个插件，方便下次使用，不喜欢在特效上边用插件，除非是特别复杂的特效，所以就自己写一下

CDN地址：https://upyun.xuanmo.xin/js/jquery.seamlessBanner.min.js

 

布局说明、结构代码示例

   banner图片列表：使用浮动，js会自动计算图片列表容器的宽度

   banner按钮容器：使用定位设置left值为50%；js自动计算像左边的偏移量

   示例代码

<!--
    html结构说明，就拿下边的结构解释：
        .banner为整个banner区域的容器
        .banner-wrap为图片列表容器，不需要设置宽度，给子级元素设置好浮动js计算宽度
        .banner-list为图片列表
        .banner-btn-wrap按钮切换的容器
        .banner-arrow-left左边切换按钮
        .banner-arrow-right右边切换按钮
-->
<div id="banenr" class="banner">
    <ul class="banner-wrap clearfix">
        <li class="banner-list">
            <img src="http://file.xuanmo.xin/TT.jpg" width="100%" height="100%" alt="">
        </li>
        <li class="banner-list">
            <img src="http://file.xuanmo.xin/T1-lg.jpg" width="100%" height="100%" alt="">
        </li>
        <li class="banner-list">
            <img src="http://file.xuanmo.xin/T2-lg.jpg" width="100%" height="100%" alt="">
        </li>
    </ul>
    <!-- banner按钮容器 -->
    <ul class="banner-btn-wrap"></ul>
    <!-- banner切换箭头 -->
    <i class="arrow-btn banner-arrow-left">&lt;</i>
    <i class="arrow-btn banner-arrow-right">&gt;</i>
</div>

 

js封装插件部分

// 默认参数
var init = {
  // 是否自动切换
  autoBanner: false,
  // 是否开启移动端滑动切换
  touchEvent: true,
  // 自动轮播间隔时间
  time: 5000,
  // 每张图片过渡时间
  transition: 1000,
  // 运动曲线
  easing: 'jswing',
  // 上一张按钮
  arrowLeftBtn(el) {
    return el.siblings('.banner-arrow-left')
  },
  // 下一张按钮
  arrowRightBtn(el) {
    return el.siblings('.banner-arrow-right')
  }
}

 

(function ($) {
  function Banner(el, options) {
    this.bannerWrap = el;
    this.bannerList = el.children();
    this.bannerBtnWrap = options.bannerBtnWrap || el.siblings('.banner-btn-wrap');
    this.bannerBtn = this.bannerBtnWrap.children();
    this.arrowLeftBtn = typeof options.arrowLeftBtn == 'function' ? options.arrowLeftBtn.call(this, el) : options.arrowLeftBtn;
    this.arrowRightBtn = typeof options.arrowRightBtn == 'function' ? options.arrowRightBtn.call(this, el) : options.arrowRightBtn;
    this.nTime = options.time;
    this.nTransitionTime = options.transition;
    this.nWindowWidth = options.wrapWidth || el.parent().width();
    this.bAutoBanner = options.autoBanner;
    this.bTouchEvent = options.touchEvent;
    this.n = 1;
    this.x = 0;
    this._x = 0;
    this.oTimer = null;
    this.easing = options.easing;
  }

  Banner.prototype = {
    constrctor: Banner,

    // 初始化轮播
    init: function init() {
      var This = this;

      // 生成banner按钮
      This.bannerList.each(function () {
        $(this).width(This.nWindowWidth);
        This.bannerBtnWrap.append('');
      });

      // 拷贝第一张和最后一张分别到第一张前面和最后一张后边
      This.bannerList.first().before(This.bannerList.last().clone().addClass('clone'));
      This.bannerList.last().after(This.bannerList.first().clone().addClass('clone'));

      // 重新获取banner
      This.bannerList = This.bannerWrap.children();

      // 获取banner按钮
      This.bannerBtn = $('li', This.bannerBtnWrap);

      // banner盒子计算宽度
      This.bannerWrap.css({
        width: This.bannerList.length * This.nWindowWidth + 'px',
        marginLeft: This.n * -This.nWindowWidth + 'px'
      });

      // banner按钮盒子计算宽度
      This.bannerBtnWrap.css({
        width: This.bannerBtn.length * This.bannerBtn.outerWidth(true) + 'px',
        marginLeft: function marginLeft() {
          return $(this).width() / -2 + 'px';
        }
      }).children('li:eq(0)').addClass('on');

      // 是否自动轮播
      This.bAutoBanner && This.autoBanner(this);
      This.resize(this).move(this).stop(this);
    },

    // 窗口发生改变改变轮播宽度
    resize: function resize(This) {
      $(window).on('resize', function () {
        This.nWindowWidth = This.bannerWrap.parent().width();
        This.bannerList.each(function () {
          $(this).width(This.nWindowWidth);
        });
        This.bannerWrap.css({
          width: This.bannerList.length * This.nWindowWidth + 'px',
          marginLeft: This.n * -This.nWindowWidth + 'px'
        });
      });
      return This;
    },

    // banner切换
    move: function move(This) {
      // 按钮切换
      This.bannerBtn.mouseenter(function () {
        if (!This.bannerWrap.is(':animated')) {
          This.n = $(this).index() + 1;
          This.bannerBtn.eq(This.n - 1).addClass('on').siblings().removeClass('on');
          This.bannerWrap.animate({
            marginLeft: This.n * -This.nWindowWidth + 'px'
          }, {
            duration: This.nTransitionTime,
            easing: This.easing
          });
        }
      });

      // 向左切换
      This.arrowLeftBtn.click(function () {
        if (!This.bannerWrap.is(':animated')) {
          This.n--;
          if (This.n < 0) {
            This.n = This.bannerList.length - 3;
            This.bannerWrap.css('marginLeft', (This.bannerList.length - 2) * -This.nWindowWidth + 'px');
          }
          This.bannerBtn.eq(This.n - 1).addClass('on').siblings().removeClass('on');
          This.bannerWrap.animate({
            marginLeft: This.n * -This.nWindowWidth + 'px'
          }, {
            duration: This.nTransitionTime,
            easing: This.easing
          });
        }
      });

      // 向右切换
      This.arrowRightBtn.click(function () {
        if (!This.bannerWrap.is(':animated')) {
          This.n++;
          if (This.n >= This.bannerList.length - 1) {
            This.n = 1;
            This.bannerWrap.css('marginLeft', (This.n - 1) * -This.nWindowWidth + 'px');
          }
          This.bannerBtn.eq(This.n - 1).addClass('on').siblings().removeClass('on');
          This.bannerWrap.animate({
            marginLeft: This.n * -This.nWindowWidth + 'px'
          }, {
            duration: This.nTransitionTime,
            easing: This.easing
          });
        }
      });

      // 移动端无缝滚动
      This.bTouchEvent && This.bannerWrap.on('touchstart', function (e) {
        This.x = e.originalEvent.touches[0].pageX;
      }).on('touchmove', function (e) {
        // e.preventDefault();
        This._x = e.originalEvent.touches[0].pageX;
        var differ = This.x - This._x > 0 ? 1 : 0;
        if (differ) {
          // 向左滑动
          if (!$(this).is(':animated')) {
            This.n++;
            if (This.n >= This.bannerList.length - 1) {
              This.n = 1;
              $(this).css('marginLeft', (This.n - 1) * -This.nWindowWidth + 'px');
            }
            This.bannerBtn.eq(This.n - 1).addClass('on').siblings().removeClass('on');
            $(this).animate({
              marginLeft: This.n * -This.nWindowWidth + 'px'
            }, {
              duration: This.nTransitionTime,
              easing: This.easing
            });
          }
        } else {
          // 向右滑动
          if (!$(this).is(':animated')) {
            This.n--;
            if (This.n < 0) {
              This.n = This.bannerList.length - 3;
              $(this).css('marginLeft', (This.bannerList.length - 2) * -This.nWindowWidth + 'px');
            }
            This.bannerBtn.eq(This.n - 1).addClass('on').siblings().removeClass('on');
            $(this).animate({
              marginLeft: This.n * -This.nWindowWidth + 'px'
            }, {
              duration: This.nTransitionTime,
              easing: This.easing
            });
          }
        }
      });
      return this;
    },

    // 自动轮播
    autoBanner: function autoBanner(This) {
      This.oTimer = setInterval(function () {
        This.arrowRightBtn.click();
      }, This.nTime);
      return this;
    },

    // 鼠标移入停止自动轮播
    stop: function stop(This) {
      This.bannerWrap.parent().hover(function () {
        clearInterval(This.oTimer);
      }, function () {
        This.bAutoBanner && This.autoBanner(This);
      });
    }

    // 默认参数
  };var init = {
    autoBanner: false,
    touchEvent: true,
    time: 5000,
    transition: 1000,
    easing: 'jswing',
    arrowLeftBtn: function arrowLeftBtn(el) {
      return el.siblings('.banner-arrow-left');
    },
    arrowRightBtn: function arrowRightBtn(el) {
      return el.siblings('.banner-arrow-right');
    }
  };

  $.fn.seamlessBanner = function (options) {
    if (this.children().length > 1) new Banner(this, $.extend(init, options)).init();
  };

  $.easing['jswing'] = $.easing['swing'];

  $.extend($.easing, {
    def: 'easeOutQuad',
    swing: function swing(x, t, b, c, d) {
      return $.easing[$.easing.def](x, t, b, c, d);
    },
    easeInQuad: function easeInQuad(x, t, b, c, d) {
      return c * (t /= d) * t + b;
    },
    easeOutQuad: function easeOutQuad(x, t, b, c, d) {
      return -c * (t /= d) * (t - 2) + b;
    },
    easeInOutQuad: function easeInOutQuad(x, t, b, c, d) {
      if ((t /= d / 2) < 1) return c / 2 * t * t + b;
      return -c / 2 * (--t * (t - 2) - 1) + b;
    },
    easeInCubic: function easeInCubic(x, t, b, c, d) {
      return c * (t /= d) * t * t + b;
    },
    easeOutCubic: function easeOutCubic(x, t, b, c, d) {
      return c * ((t = t / d - 1) * t * t + 1) + b;
    },
    easeInOutCubic: function easeInOutCubic(x, t, b, c, d) {
      if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
      return c / 2 * ((t -= 2) * t * t + 2) + b;
    },
    easeInQuart: function easeInQuart(x, t, b, c, d) {
      return c * (t /= d) * t * t * t + b;
    },
    easeOutQuart: function easeOutQuart(x, t, b, c, d) {
      return -c * ((t = t / d - 1) * t * t * t - 1) + b;
    },
    easeInOutQuart: function easeInOutQuart(x, t, b, c, d) {
      if ((t /= d / 2) < 1) return c / 2 * t * t * t * t + b;
      return -c / 2 * ((t -= 2) * t * t * t - 2) + b;
    },
    easeInQuint: function easeInQuint(x, t, b, c, d) {
      return c * (t /= d) * t * t * t * t + b;
    },
    easeOutQuint: function easeOutQuint(x, t, b, c, d) {
      return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
    },
    easeInOutQuint: function easeInOutQuint(x, t, b, c, d) {
      if ((t /= d / 2) < 1) return c / 2 * t * t * t * t * t + b;
      return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;
    },
    easeInSine: function easeInSine(x, t, b, c, d) {
      return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
    },
    easeOutSine: function easeOutSine(x, t, b, c, d) {
      return c * Math.sin(t / d * (Math.PI / 2)) + b;
    },
    easeInOutSine: function easeInOutSine(x, t, b, c, d) {
      return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
    },
    easeInExpo: function easeInExpo(x, t, b, c, d) {
      return t == 0 ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;
    },
    easeOutExpo: function easeOutExpo(x, t, b, c, d) {
      return t == d ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
    },
    easeInOutExpo: function easeInOutExpo(x, t, b, c, d) {
      if (t == 0) return b;
      if (t == d) return b + c;
      if ((t /= d / 2) < 1) return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
      return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;
    },
    easeInCirc: function easeInCirc(x, t, b, c, d) {
      return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
    },
    easeOutCirc: function easeOutCirc(x, t, b, c, d) {
      return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
    },
    easeInOutCirc: function easeInOutCirc(x, t, b, c, d) {
      if ((t /= d / 2) < 1) return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
      return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
    },
    easeInElastic: function easeInElastic(x, t, b, c, d) {
      var s = 1.70158;
      var p = 0;
      var a = c;
      if (t == 0) return b;
      if ((t /= d) == 1) return b + c;
      if (!p) p = d * .3;
      if (a < Math.abs(c)) {
        a = c;
        var s = p / 4;
      } else var s = p / (2 * Math.PI) * Math.asin(c / a);
      return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
    },
    easeOutElastic: function easeOutElastic(x, t, b, c, d) {
      var s = 1.70158;
      var p = 0;
      var a = c;
      if (t == 0) return b;
      if ((t /= d) == 1) return b + c;
      if (!p) p = d * .3;
      if (a < Math.abs(c)) {
        a = c;
        var s = p / 4;
      } else var s = p / (2 * Math.PI) * Math.asin(c / a);
      return a * Math.pow(2, -10 * t) * Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b;
    },
    easeInOutElastic: function easeInOutElastic(x, t, b, c, d) {
      var s = 1.70158;
      var p = 0;
      var a = c;
      if (t == 0) return b;
      if ((t /= d / 2) == 2) return b + c;
      if (!p) p = d * (.3 * 1.5);
      if (a < Math.abs(c)) {
        a = c;
        var s = p / 4;
      } else var s = p / (2 * Math.PI) * Math.asin(c / a);
      if (t < 1) return -.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
      return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p) * .5 + c + b;
    },
    easeInBack: function easeInBack(x, t, b, c, d, s) {
      if (s == undefined) s = 1.70158;
      return c * (t /= d) * t * ((s + 1) * t - s) + b;
    },
    easeOutBack: function easeOutBack(x, t, b, c, d, s) {
      if (s == undefined) s = 1.70158;
      return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
    },
    easeInOutBack: function easeInOutBack(x, t, b, c, d, s) {
      if (s == undefined) s = 1.70158;
      if ((t /= d / 2) < 1) return c / 2 * (t * t * (((s *= 1.525) + 1) * t - s)) + b;
      return c / 2 * ((t -= 2) * t * (((s *= 1.525) + 1) * t + s) + 2) + b;
    },
    easeInBounce: function easeInBounce(x, t, b, c, d) {
      return c - $.easing.easeOutBounce(x, d - t, 0, c, d) + b;
    },
    easeOutBounce: function easeOutBounce(x, t, b, c, d) {
      if ((t /= d) < 1 / 2.75) {
        return c * (7.5625 * t * t) + b;
      } else if (t < 2 / 2.75) {
        return c * (7.5625 * (t -= 1.5 / 2.75) * t + .75) + b;
      } else if (t < 2.5 / 2.75) {
        return c * (7.5625 * (t -= 2.25 / 2.75) * t + .9375) + b;
      } else {
        return c * (7.5625 * (t -= 2.625 / 2.75) * t + .984375) + b;
      }
    },
    easeInOutBounce: function easeInOutBounce(x, t, b, c, d) {
      if (t < d / 2) return $.easing.easeInBounce(x, t * 2, 0, c, d) * .5 + b;
      return $.easing.easeOutBounce(x, t * 2 - d, 0, c, d) * .5 + c * .5 + b;
    }
  });
})(jQuery);

 

插件调用

$('.banner-wrap').seamlessBanner();

 

DEMO展示
源码下载