js实现点击按钮时显示弹框，点击按钮及弹框以外的区域时隐藏弹框

 实现效果：

 HTML结构：

图二:

<!--按钮 -->
                <div class="add-new-user-head-icon" ref="selectDataRulesBtnRef"><app-svg-icon icon-name="add-sm" class="w-20 h-20 cursor-pointer" @click="handleAddRuleItem()"/></div>

  <!-- 弹窗 -->
              <div class="infinite-scroll" v-show="isShowScroll" @click.stop ref="selectDataRulesRef">
                <div class="infinite-list">
                  <!-- 搜索输入框 -->
                  <div class="p-5">
                    <el-input v-model.trim="searchInputValue" @input="searchInputChange">
                      <template #prefix>
                        <app-svg-icon icon-name="search" class="w-19 h-19 search-icon" />
                      </template>
                    </el-input>
                  </div>
                  <!-- 滚动列表 -->
                  <ul class="border-t border-gray-200 py-4 overflow-y-auto flex-1">
                    <el-scrollbar height="200px">
                      <li
                        v-for="(item, index) in totalData.dataProcessingRulesRst"
                        :key="index"
                        class="cursor-pointer infinite-list-item overflow-hidden"
                        @click="handleSelectDataProcessingRule(item)"
                      >
                        <div class="flex-column">
                          <div class="w-250 text-ellipsis">{{ item.RuleName }}</div>

                          <div class="list-desc w-250 text-ellipsis">{{ '创自 ' + item.Creator + ' · ' + item.CreateTime }}</div>
                        </div>
                      </li>
                    </el-scrollbar>
                  </ul>
                </div>
              </div>

按钮以及弹窗区域都需要绑定ref获取dom

css样式

---弹窗的滚动列表样式----
.infinite-scroll {
  .infinite-list {
    position: absolute;
    left: 215px;
    right: 0px;
    background: #ffffff;
    width: 320px;
    box-shadow: 0px 0px 0px 1px rgba(11, 11, 45, 0.09), 0px 8px 12px -4px rgba(82, 82, 82, 0.12), 0px 16px 24px -8px rgba(82, 82, 82, 0.12);
    border-radius: 7px;
    // height: 250px;
    z-index: 9999;
    padding: 0;
    margin: 0;
    list-style: none;
    .list-desc {
      font-size: 12px;
      color: #6e7381;
    }
  }
  .infinite-list .infinite-list-item {
    padding-left: 5px;
    display: flex;
    align-items: center;
    height: 50px;
    margin: 10px;
  }
  .infinite-list .infinite-list-item:hover {
    background: rgba(188, 189, 194, 0.2);
    border-radius: 6px;
  }
  .infinite-list .infinite-list-item + .list-item {
    margin-top: 10px;
  }
}

js:

1、定义html区域绑定的ref

const selectDataRulesRef = ref(null)
const selectDataRulesBtnRef = ref(null)

 2、定义变量v-show绑定--控制弹窗的显示隐藏

const isShowScroll = ref(false)

3、点击按钮实现基础的开关

const handleAddRuleItem = () => {
  isShowScroll.value = !isShowScroll.value
}

2、在OnMounted生命周期里面

//点击规则列表弹窗区域关闭弹窗
  nextTick(() => {
      
      document.addEventListener('mouseup', e => {
        // 如果点击的是按钮   则不执行下面的操作
        if (selectDataRulesRef.value&&selectDataRulesBtnRef.value) {
          if(selectDataRulesBtnRef.value.contains(e.target)){
            return
          }
     
          if (!selectDataRulesRef.value.contains(e.target)) {
            // 点击的区域不包含在弹窗区域之内就关闭弹窗

              isShowScroll.value = false


          
           
             // 点击按钮也属于弹窗区域外
            // 点击按钮进过MOUNTED  FALSE->TRUE
            // 再次点击按钮进过MOUNTED  FALSE->TRUE，导致弹窗不能关闭

            //所以需要判断，如果点击的是按钮就不需要执行弹窗外关闭弹窗的逻辑

            




          }
        }
      })


    

  })