效果图

页面展现

      <el-form-item label="课程标签">
        <el-tag
            v-for="tag in dynamicTags"
            :key="tag"
            class="mx-1"
            closable
            :disable-transitions="false"
            @close="handleClose(tag)"
            style="margin:5px;"
        >
          {{ tag }}
        </el-tag>
        <el-input
            style="width:200px;"
            v-if="inputVisible"
            ref="InputRef"
            v-model="inputValue"
            class="ml-1 w-20"
            size="small"
            @keyup.enter="handleInputConfirm"
            @blur="handleInputConfirm"
        />
        <el-button v-else class="button-new-tag ml-1" size="small" @click="showInput">
          + 新标签
        </el-button>
      </el-form-item>

初始化

//tag标签
const inputValue = ref('')
const dynamicTags = ref([])

const inputVisible = ref(false)
const InputRef = ref()

const handleClose = (tag) => {
  dynamicTags.value.splice(dynamicTags.value.indexOf(tag), 1)
}

const showInput = () => {
  inputVisible.value = true
  nextTick(() => {
    InputRef.value.input.focus()
  })
}

const handleInputConfirm = () => {
  if (inputValue.value) {
    dynamicTags.value.push(inputValue.value)
  }
  inputVisible.value = false
  inputValue.value = ''
}

保存时

//把数组转化成字符串，多个值以逗号隔开
  form.data.tags = dynamicTags.value.join(",")

回显时

//回显课程标签：数据库存储字符串，页面是数组。
  dynamicTags.value = form.data.tags.split(",")   //将字符串拆成数组