vue NavMenu(菜单超出显示更多)_vue 顶部菜单宽度超出处理

效果图（不超出）

效果图（超出）

代码

<template>
  <div class="box">
    <el-menu
      :default-active="activeIndex"
      class="el-menu-demo menuList"
      mode="horizontal"
      @select="handleSelect"
    >
      <el-menu-item
        v-for="item in data"
        :key="item.id"
        class="menuItem"
        :index="item.id"
        >{{ item.text }}</el-menu-item
      >
      <el-submenu v-if="moreArr.length > 0" class="menuItem" index="99999">
        <template slot="title">更多</template>
        <el-menu-item v-for="i in moreArr" :key="i.id" :index="i.id">{{
          i.text
        }}</el-menu-item>
      </el-submenu>
    </el-menu>
  </div>
</template>

<script>
export default {
  data() {
    return {
      activeIndex: "1",
      activeIndex2: "1",
      data: [
        {
          id: "1",
          text: "处理中心",
        },
        {
          id: "2",
          text: "处理中心2ss",
        },
        {
          id: "3",
          text: "处理中心3",
        },
        {
          id: "4",
          text: "处理中心4",
        },
        {
          id: "5",
          text: "处理中心5",
        },
        {
          id: "6",
          text: "处理中心6",
        },
        {
          id: "7",
          text: "处理中心7",
        },
        {
          id: "8",
          text: "处理中心8",
        },
        {
          id: "9",
          text: "处理中心9",
        },
        {
          id: "10",
          text: "处理中心10",
        },
        {
          id: "11",
          text: "处理中心11",
        },
        {
          id: "12",
          text: "处理中心12",
        },
        {
          id: "13",
          text: "处理中心13",
        },
        {
          id: "14",
          text: "处理中心14",
        },
        {
          id: "15",
          text: "处理中心15",
        },
        {
          id: "16",
          text: "处理中心16",
        },
        {
          id: "17",
          text: "处理中心17",
        },
        {
          id: "18",
          text: "处理中心18",
        },
      ],
      newArr: [],
      existing: 0,
      moreArr: [],
      isb: false,
    };
  },
  computed: {
    activeinHouseList: function () {
      return this.data.filter((item) => {
        return item.text != "更多";
      });
    },
    moreList: function () {
      return this.data.filter((item) => {
        return item.text == "更多";
      });
    },
  },
  mounted() {
    let newArr = JSON.parse(JSON.stringify(this.data));
    let menuitem = document.getElementsByClassName("menuItem");
    let widthArr = [];
    for (let i = 0; i < menuitem.length; i++) {
      widthArr.push(menuitem[i].clientWidth);
    }
    this.isbeyond(widthArr);
    //更多的数组
    let arr = [];
    if (this.existing != 0) {
      arr = newArr.splice(this.existing, newArr.length - 1);
    }
    this.moreArr = arr;
  },
  methods: {
    handleSelect(key, keyPath) {
      console.log(key, keyPath);
    },
    sum(arr) {
      return arr.reduce(function (prev, curr, idx, arr) {
        return prev + curr;
      });
    },
    isbeyond(widthArr) {
      let menu = document.getElementsByClassName("menuList");
      if (this.sum(widthArr) > menu[0].clientWidth) {
        this.isb = true;
        let newArr = this.data.slice(0, this.data.length - 1);
        let newWidthArr = widthArr.slice(0, this.data.length - 1);
        this.data = newArr;
        this.isbeyond(newWidthArr);
      } else {
        if (this.isb) {
          let newArr = this.data.slice(0, this.data.length - 1);
          let newWidthArr = widthArr.slice(0, this.data.length - 1);
          this.data = newArr;
          this.existing = newWidthArr.length;
        }
      }
    },
  },
};
</script>

<style lang="less" scoped>
.box {
  background: #fff;
  width: 80%;
  margin: 0 auto;
}
</style>
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