老师看一下我的代码是哪里有问题

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老师看一下我的代码是哪里有问题

来源：6-2 项目作业

API调用工程师

2021-03-18 20:48:33

问题描述：

我目前刚开始写这个项目，只是想实现传入初始索引，然后会变化当前的图片。

相关代码：

base.js

import { ELEMENT_NODE_TYPE } from "./constants.js";

import DEFAULTS from "./defaults.js";
class BaseSlider {
  constructor(el, options) {
    if (el.nodeType !== ELEMENT_NODE_TYPE) {
      throw new Error("实例化的时候，请传入 DOM 元素！");
    }
    // 实际参数
    this.options = {
      ...DEFAULTS,
      ...options,
    };
    const sliderEl = el;
    const sliderContentEl = sliderEl.querySelector(".slider-content");
    const sliderItemEls = sliderContentEl.querySelectorAll(".slider-item");
    // 添加到 this 上，为了在方法中使用
    this.sliderEl = sliderEl;
    this.sliderContentEl = sliderContentEl;
    this.sliderItemEls = sliderItemEls;

    this.minIndex = 0;
    this.maxIndex = sliderItemEls.length - 1;
    this.currIndex = this.getCorrectedIndex(this.options.initialIndex);

    this.init();
  }
  init() {
    //切换到初始索引 initialIndex
    this.to(this.currIndex);
  }
  getCorrectedIndex(index) {
    if (index < this.minIndex) return this.maxIndex;
    if (index > this.maxIndex) return this.minIndex;
    return index;
  }
  to(index) {
    index = this.getCorrectedIndex(index);
    if (this.currIndex === index) return;
    this.currIndex = index;
    for (const items of this.sliderItemEls) {
      items.style.opacity = 0;
    }

    items[index].style.classList.add("slider-item-active");
  }
}

export default BaseSlider;

constants.js

export const ELEMENT_NODE_TYPE = 1;

defaults.js

const DEFAULTS = {
  // 初始索引
  initialIndex: 0,
};
export default DEFAULTS;

index.js

import Slider from "./slider.js";

new Slider(document.querySelector(".banner-slider"), {
  initialIndex: 2,
});

slider.js

import BaseSlider from "./base.js";
// 继承基类
class Slider extends BaseSlider {
  constructor(el, options) {
    super(el, options);
  }
}

export default Slider;

index.html

  <!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Document</title>
    <link rel="stylesheet" href="css/base.css" />
    <link rel="stylesheet" href="css/index.css" />
  </head>

  <body>
    <div class="wrap">
      <!-- 第一种切换方式 -->
      <div class="banner demo">
        <h3>自动或点击小圆点切换图片</h3>
        <div class="slider-layout">
          <div class="banner-slider slider">
            <div class="slider-content">

              <div class="slider-item">
                <img src="img/banner01.png" alt="" />
              </div>
              <div class="slider-item">
                <img src="img/banner02.png" alt="" />
              </div>
              <div class="slider-item">
                <img src="img/banner03.png" alt="" />
              </div>
            </div>
            <div class="dots pagination">
              <span class="active"></span>
              <span></span>
              <span></span>
            </div>
          </div>
        </div>
      </div>
      <!-- 第二种切换方式 -->
      <div class="tab demo">
        <h3>选项卡切换</h3>
        <div class="slider-layout">
          <div class="tab-slider slider">
            <div class="slider-content">
              <div class="slider-item slider-item-active">
                <img src="img/banner01.png" alt="" />
              </div>
              <div class="slider-item">
                <img src="img/banner02.png" alt="" />
              </div>
              <div class="slider-item">
                <img src="img/banner03.png" alt="" />
              </div>
              <div class="slider-item">
                <img src="img/banner03.png" alt="" />
              </div>
            </div>
            <div class="pagination">
              <span class="active">最新招标</span>
              <span>装修日记</span>
              <span>装修百科</span>
            </div>
          </div>
        </div>
      </div>
      <!-- 第三种切换方式 -->
      <div class="pagination-arrow demo">
        <h3>按钮和小圆点切换</h3>
        <div class="slider-layout">
          <div class="banner-slider slider">
            <div class="slider-content">
              <div class="slider-item slider-item-active">
                <img src="img/banner01.png" alt="" />
              </div>
              <div class="slider-item">
                <img src="img/banner02.png" alt="" />
              </div>
              <div class="slider-item">
                <img src="img/banner03.png" alt="" />
              </div>
            </div>
            <div class="dots pagination">
              <span class="active"></span>
              <span></span>
              <span></span>
            </div>
            <div class="arrow">
              <div class="prev"></div>
              <div class="next"></div>
            </div>
          </div>
        </div>
      </div>
    </div>
    <script src="./js/index.js" type="module"></script>
  </body>
</html>

base.css

* {
  margin: 0;
  padding: 0;
  font-family: "微软雅黑";
  box-sizing: border-box;
}
/* layout */
.wrap {
  width: 1200px;
  margin: 0 auto;
}
.demo {
  margin-bottom: 20px;
}
.demo {
  background: #f2f2f2;
}
.slider-layout {
  width: 1200px;
  height: 300px;
  margin: 0 auto;
  cursor: pointer;
}
/* slider */

.slider,
.slider-content,
.slider-item,
.slider-img {
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.slider {
  overflow: hidden;
  position: relative;
  border-radius: 8px;
  border: 1px solid gray;
  -webkit-border-radius: 8px;
  -moz-border-radius: 8px;
  -ms-border-radius: 8px;
  -o-border-radius: 8px;
}

.slider-item {
  position: absolute;
  top: 0;
  left: 0;
  transition: all 0.3s;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  -ms-transition: all 0.3s;
  -o-transition: all 0.3s;
}
.slider-item img {
  width: 100%;
  height: 300px;
}

.slider-item-active {
  opacity: 1;
  transition: all 0.3s;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  -ms-transition: all 0.3s;
  -o-transition: all 0.3s;
}

/* 小圆点 */

.dots {
  position: absolute;
  left: 50%;
  transform: translate(-50%);
  bottom: 20px;
}

.dots span {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin: 0 5px;
  border-radius: 50%;
  background: #333;
}

.dots span.active {
  background: #0058aa;
  transform: scale(1.5);
  -webkit-transform: scale(1.5);
  -moz-transform: scale(1.5);
  -ms-transform: scale(1.5);
  -o-transform: scale(1.5);
}

/* arrow */

.arrow div {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.3) no-repeat center center;
  background-size: 48px 48px;
}

.arrow .prev {
  left: 0;
  background-image: url("../img/prev.png");
}

.arrow .next {
  right: 0;
  background-image: url("../img/next.png");
}
h3 {
  font-size: 32px;
  color: #696868;
  font-weight: normal;
  text-align: center;
  padding: 20px 0;
}

index.css


/* 第二种样式 */
.tab .slider-layout {
    height: 360px;
}
.tab-slider {
    padding-top: 60px;
}
.tab-slider  .pagination {
    position: absolute;
    top:0;
    width: 100%;
}
.tab-slider  .pagination span{
    float:left;
    width: 33.33%;
    line-height: 60px;
    text-align:center;
    border-radius:8px;
    -webkit-border-radius:8px;
    -moz-border-radius:8px;
    -ms-border-radius:8px;
    -o-border-radius:8px;
}
.tab-slider .slider-item{
    top: 60px;
}
.tab-slider  .pagination span.active {
    color: #fff;
    background: #0058AA;
}

/* 第三种方式 */
.pagination-arrow  .arrow div{
    opacity: 0;
}