vue--实现移动端导航栏效果

基本步骤：1.搭建页面的基本结构和利用 v-for 渲染对应的数据<template><div class="wrap"><div class="nav_left" id="navLeft"><div class="nav_content"><span v-for="(obj, index) in arr" :key="obj.first_id

小白小白从不日白

3907人浏览 · 2021-12-08 14:45:30

小白小白从不日白 · 2021-12-08 14:45:30 发布

基本步骤：

1.搭建页面的基本结构和利用 v-for 渲染对应的数据

<template>
  <div class="wrap">
    <div class="nav_left" id="navLeft">
      <div class="nav_content">
        <span v-for="(obj, index) in arr" :key="obj.first_id" @click="changeTab(index)">{{obj.first_name}}</span>
      </div>
    </div>
    <div class="down">
      <i class="iconfont icon-xiajiantoubeifen gray"></i>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [
        {
          first_id: "0",
          first_name: "热门"
        },
        {
          first_id: "621",
          first_name: "\u5496\u5561",
        },
        {
          first_id: "627",
          first_name: "\u996e\u98df",
        },
        {
          first_id: "279",
          first_name: "\u7537\u88c5",
        },
        {
          first_id: "294",
          first_name: "\u5973\u88c5",
        },
        {
          first_id: "122",
          first_name: "\u773c\u955c",
        },
        {
          first_id: "339",
          first_name: "\u5185\u8863\u914d\u9970",
        },
        {
          first_id: "391",
          first_name: "\u6bcd\u5a74",
        },
        {
          first_id: "35",
          first_name: "\u978b\u9774",
        },
        {
          first_id: "39",
          first_name: "\u8fd0\u52a8",
        },
        {
          first_id: "153",
          first_name: "\u7bb1\u5305",
        },
        {
          first_id: "119",
          first_name: "\u7f8e\u5986\u4e2a\u62a4",
        },
        {
          first_id: "355",
          first_name: "\u5bb6\u7eba",
        },
        {
          first_id: "51",
          first_name: "\u9910\u53a8",
        },
        {
          first_id: "334",
          first_name: "\u7535\u5668",
        },
        {
          first_id: "369",
          first_name: "\u5bb6\u88c5",
        },
        {
          first_id: "10",
          first_name: "\u5bb6\u5177",
        },
        {
          first_id: "223",
          first_name: "\u6570\u7801",
        },
        {
          first_id: "429",
          first_name: "\u6c7d\u914d",
        },
        {
          first_id: "546",
          first_name: "\u5065\u5eb7\u4fdd\u5065",
        },
        {
          first_id: "433",
          first_name: "\u5b9a\u5236",
        },
      ],
    };
  }
};
</script>

<style>
.wrap {
  width: 100%;
  display: flex;
  margin: 0.2rem 0 0 0;
  position: relative;
}

/*左侧的导航样式*/
.nav_left {
  width: 21.1875rem;
  overflow: scroll;
}

.nav_left::-webkit-scrollbar {
  display: none;
}

.nav_content {
  white-space: nowrap;
  padding: 0 0.7rem;
}

.nav_content span {
  display: inline-block;
  padding: 0.4rem 0.6rem;
  font-size: 0.875rem;
}

.nav_content .active {
  border-bottom: 2px solid #7f4395;
  color: #7f4395;
}

.nav_left,
.down {
  float: left;
}

/*右侧导航部分*/
.down {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.gray {
  color: gray;
  display: inline-block;
  vertical-align: middle;
}
</style>

2.在 data 中定义一一个变量来记录当前哪个索引对应的 sapn 需要高亮(默认第0个)显示；在 span 元素里利用动态class(:class="")来进行判断：当前记录的索引（isSlecIndex ）是否等于当前 span 元素对应的索引（index），如果相等那么就添加高亮显示的 class（active），否则就不添加

data {
  return: {
      isSlecIndex: 0, // 记录当前应该哪个索引对应的 sapn 需要高亮(默认第0个)
   }
}

<span :class="{active: isSlecIndex == index}">{{obj.first_name}}</span>

3.给 span 标签添加点击事件并将当前的 index 所有当作参数传给该事件，实现点击哪个导航栏就让其对应的 this.isSlecIndex = index 这样就可以达到高亮显示，其余未点击的导航栏保持默认

 <span @click="changeTab(index)">{{obj.first_name}}</span>

  methods: {
    changeTab (index) {
      this.isSlecIndex == index // 把 isSlecIndex 的值赋予给应该高亮的 span 元素的 index，即可实现 
    }
  }

完整代码：

<template>
  <div class="wrap">
    <div class="nav_left" id="navLeft">
      <div class="nav_content">
        <span :class="{active: isSlecIndex == index}" v-for="(obj, index) in arr" :key="obj.first_id" @click="changeTab(index)">{{obj.first_name}}</span>
      </div>
    </div>
    <div class="down">
      <i class="iconfont icon-xiajiantoubeifen gray"></i>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      isSlecIndex: 0, // 记录当前应该哪个索引对应的 sapn 需要高亮(默认第0个)
      arr: [
        {
          first_id: "0",
          first_name: "热门"
        },
        {
          first_id: "621",
          first_name: "\u5496\u5561",
        },
        {
          first_id: "627",
          first_name: "\u996e\u98df",
        },
        {
          first_id: "279",
          first_name: "\u7537\u88c5",
        },
        {
          first_id: "294",
          first_name: "\u5973\u88c5",
        },
        {
          first_id: "122",
          first_name: "\u773c\u955c",
        },
        {
          first_id: "339",
          first_name: "\u5185\u8863\u914d\u9970",
        },
        {
          first_id: "391",
          first_name: "\u6bcd\u5a74",
        },
        {
          first_id: "35",
          first_name: "\u978b\u9774",
        },
        {
          first_id: "39",
          first_name: "\u8fd0\u52a8",
        },
        {
          first_id: "153",
          first_name: "\u7bb1\u5305",
        },
        {
          first_id: "119",
          first_name: "\u7f8e\u5986\u4e2a\u62a4",
        },
        {
          first_id: "355",
          first_name: "\u5bb6\u7eba",
        },
        {
          first_id: "51",
          first_name: "\u9910\u53a8",
        },
        {
          first_id: "334",
          first_name: "\u7535\u5668",
        },
        {
          first_id: "369",
          first_name: "\u5bb6\u88c5",
        },
        {
          first_id: "10",
          first_name: "\u5bb6\u5177",
        },
        {
          first_id: "223",
          first_name: "\u6570\u7801",
        },
        {
          first_id: "429",
          first_name: "\u6c7d\u914d",
        },
        {
          first_id: "546",
          first_name: "\u5065\u5eb7\u4fdd\u5065",
        },
        {
          first_id: "433",
          first_name: "\u5b9a\u5236",
        },
      ],
    };
  },
  methods: {
    changeTab (index) {
      this.isSlecIndex = index // 把 isSlecIndex 的值赋予给应该高亮的 span 元素的 index，即可实现 
    }
  }
};
</script>

<style>
.wrap {
  width: 100%;
  display: flex;
  margin: 0.2rem 0 0 0;
  position: relative;
}

/*左侧的导航样式*/
.nav_left {
  width: 21.1875rem;
  overflow: scroll;
}

.nav_left::-webkit-scrollbar {
  display: none;
}

.nav_content {
  white-space: nowrap;
  padding: 0 0.7rem;
}

.nav_content span {
  display: inline-block;
  padding: 0.4rem 0.6rem;
  font-size: 0.875rem;
}

.nav_content .active {
  border-bottom: 2px solid #7f4395;
  color: #7f4395;
}

.nav_left,
.down {
  float: left;
}

/*右侧导航部分*/
.down {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.gray {
  color: gray;
  display: inline-block;
  vertical-align: middle;
}
</style>

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