2023面试高手

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作者：2023面试高手 | 2024-02-14 21:56:12

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element-plus

table

1、el-table自定义表格偶数及奇数背景

<template>
	<el-table
	  :row-class-name="tableRowClassName"
	>
	</el-table>
</template>
<script setup>
	const tableRowClassName = ({ rowIndex }) => {
	  const index = rowIndex + 1
	  if (index % 2 === 0) {
	    return 'even-number'
	  } else if (index % 2 === 1) {
	    return 'odd-number'
	  }
	}
</script>

<style lang="scss" scoped>
:deep(.odd-number) {
  background-color: #F3F3F5;
}
</style>

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2、el-table自定义表头背景

<template>
	<el-table
	  :header-cell-style="headerName">
	</el-table>
</template>
<script setup>
	const headerName = () => {
	  return 'background: linear-gradient(180deg, #E8E8E8 0%, #CCCCCC 100%)'
	}
</script>
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3、el-table取消下边框

:deep(.el-table) {
    .el-table__row>td{
        border: none;
    }
    .el-table__inner-wrapper::before{ // 取消td的border之后，若最下方还有一个边框，则需要此代码
        content: unset;
    }
}
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4、table表格显示数组内容

直接展示当前字段时会把’[’ ']'也显示出来

<el-table-column
  property="free_param"
  label="自由参数定制">// 假设scope.row.free_param为[1,3,4,5,6]
  <template #default="scope">
    <template v-if="scope.row.free_param.length">
      <p v-for="itemin scope.row.free_param">
        {{ item }}
      </p>
    </template>
    <template v-else>
      —
    </template>
  </template>
</el-table-column>
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5、table表格可多选状态下，禁止部分行选中(selectable)

<el-table
    :data="sliceTableData"
    v-loading="loading"
>
    <el-table-column type="selection" width="55" :selectable="isSelectTable"/>
</el-table>

function isSelectTable(row: any, index: number) {
    return row.auditStatus === '条件判断'
}
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6、table多级表头及固定某一列的内容(el-table-column包裹)

在这里插入图片描述

<el-table
  :data="tableData"
 >
   <el-table-column label="Delivery Info">
     <el-table-column prop="" label="" width="120" >
       <template #default="{row, $index}">
           {{ sexList($index) }}
         </template>
     </el-table-column>
     <el-table-column prop="state" label="State" width="120" />
     <el-table-column prop="city" label="City" width="120" />
   </el-table-column>
   <el-table-column>
     <el-table-column prop="name" label="" width="120">
         <template #default="{row, $index}">
           {{ sexList($index) }}
         </template>
       </el-table-column>
     <el-table-column prop="address" label="Address" width="250"/>
     <el-table-column prop="zip" label="Zip" width="120" />
   </el-table-column>
 </el-table>
 const tableData = [
  {
    date: '2016-05-03',
    name: 'Tom',
    state: 0,
    city: 'Los Angeles',
    address: 'No. 189, Grove St, Los Angeles',
    zip: 'CA 90036',
    color: '#FFB6C1'
  },
  {
    date: '2016-05-02',
    name: 'Tom',
    state: 0,
    city: 'Los Angeles',
    address: 'No. 189, Grove St, Los Angeles',
    zip: 'CA 90036',
    color: '#DC143C'
  },
  {
    date: '2016-05-04',
    name: 'Tom',
    state: 1,
    city: 'Los Angeles',
    address: 'No. 189, Grove St, Los Angeles',
    zip: 'CA 90036',
    color: '#FFF0F5'
  },
  {
    date: '2016-05-01',
    name: 'Tom',
    state: 1,
    city: 'Los Angeles',
    address: 'No. 189, Grove St, Los Angeles',
    zip: 'CA 90036',
    color: '#C71585'
  },
  {
    date: '2016-05-08',
    name: 'Tom',
    state: 0,
    city: 'Los Angeles',
    address: 'No. 189, Grove St, Los Angeles',
    zip: 'CA 90036',
    color: '#DDA0DD'
  },
  {
    date: '2016-05-06',
    name: 'Tom',
    state: 1,
    city: 'Los Angeles',
    address: 'No. 189, Grove St, Los Angeles',
    zip: 'CA 90036',
    color: '#FF00FF'
  },
  {
    date: '2016-05-07',
    name: 'Tom',
    state: 0,
    city: 'Los Angeles',
    address: 'No. 189, Grove St, Los Angeles',
    zip: 'CA 90036',
    color: '#B0E0E6'
  },
]
 function sexList (index) {
  const list = [
    '平均值',
    '什么什么值',
    '最大值',
    '最小值',
    '标准误',
    '计数'
  ]
  return list[index]
}
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7、table自定义行的背景色(:row-style)

在这里插入图片描述

<el-table
  :data="tableData"
  :row-style="colorConvert"
>
  <el-table-column prop="name" label="Address" width="120" />
  <el-table-column prop="zip" label="Zip" width="120" />
  <el-table-column prop="state" label="State" width="120" />
  <el-table-column prop="city" label="City" width="120" />
</el-table>

<el-table
  :data="tableData"
  :row-style="stateColor"
>
  <el-table-column prop="name" label="Address" width="120" />
  <el-table-column prop="zip" label="Zip" width="120" />
  <el-table-column prop="state" label="State" width="120" />
  <el-table-column prop="city" label="City" width="120" />
</el-table>
const tableData = [
  {
    date: '2016-05-03',
    name: 'Tom',
    state: 0,
    city: 'Los Angeles',
    address: 'No. 189, Grove St, Los Angeles',
    zip: 'CA 90036',
    color: '#FFB6C1'
  },
  {
    date: '2016-05-02',
    name: 'Tom',
    state: 0,
    city: 'Los Angeles',
    address: 'No. 189, Grove St, Los Angeles',
    zip: 'CA 90036',
    color: '#DC143C'
  }]
function colorConvert ({ row, rowIndex }) {
  return {
    backgroundColor: row.color
  }
}
function stateColor ({ row, rowIndex }) {
  if (row.state === 1) {
    return {
      backgroundColor: 'red'
    }
  }
}
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el-date-picker

1、el-date-picker自定义图标

<template>
	<el-date-picker
       :prefix-icon="customPrefix">
     </el-date-picker>
</template>

<script setup>
	const customPrefix = shallowRef({
	  render () { // class为自定义的图标类名
	    return h('p', { class: 'icon-rili-01 font_family icon-size' })
	  }
	})
</script>
<style> // 不需要修改图标定位的不用写
:deep(.el-input__prefix) { // element plus 日历中图标的类名是el-input__prefix
  right: 5px;
  left: unset; // element设置的定位，left为5px，这里取消默认的left
}
</style>
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el-menu

1、el-menu绑定router

<template>
  <div class="side-bar">
    <el-menu
      class="el-menu-vertical-demo"
      :default-active="$route.path"  // 记得绑定
      router>
      <el-sub-menu  v-for="(item, key) in menuList"
      :key="key"
      :index="key+''">
        <template #title>
          <span>{{ item.menuName }}</span>
        </template>
        <el-menu-item-group v-for="(childItem, childKey) in item.children" :key="childKey">
          <el-menu-item :index="childItem.url">
            {{ childItem.menuName }}
          </el-menu-item>
        </el-menu-item-group>
      </el-sub-menu>
    </el-menu>
  </div>

</template>

<script setup>
import { reactive } from 'vue'

const menuList = reactive([
  {
    menuName: 'slurm可视化',
    children: [{ menuName: '工作列表', url: '/slurm'}]
  },
  {
    menuName: '显卡列表',
    children: [{ menuName: '录入显卡', url: '/graphicsCard'}]
  },
  {
    menuName: '录入算法任务',
    children: [{ menuName: '录入任务', url: '/algorithm'}]
  },
  {
    menuName: '设置',
    children: [
      { menuName: '权限分配', url: '/setting/permissions', name: 'permissions' },
      { menuName: '用户列表', url: '/setting/userList', name: 'user' },
      { menuName: '角色分配', url: '/setting/role', name: 'role' }
    ]
  }
])

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图标

1、图标使用

$ npm install @element-plus/icons-vue
或
$ yarn add @element-plus/icons-vue
或
$ pnpm install @element-plus/icons-vue

<template>
<el-icon size="18px" color="#fff">
	<refresh />
</el-icon>
</template>
<script>
import { Refresh, Search } from '@element-plus/icons-vue' // 第一个字母切记需要大写，除此之外与标签显示一致
</script>

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el-form

1、同一个form-item多个输入框(可增减)，并进行表单验证

// --------template
<el-form
  ref="formRef"
  :model="form"
  :rules="rules"
  label-position="left"
  label-width="120px"
>
<el-form-item
   label="自由参数定制"
   class="free-param"
   prop="free_param"
 >
   <!-- v-for="item in form.free_param" -->
   <div class="free-param-one">
     <el-input v-model="form.free_param[0]"></el-input>
     <span @click="addFreeParam">
         <el-icon size="20px"><Plus /></el-icon>
     </span>
   </div>
   <template v-if="form.free_param.length > 1">
     <div
       class="free-param-one"
       v-for="(item, index) in form.free_param.length - 1"
     >
       <el-input v-model="form.free_param[index+1]">
       </el-input>
       <span @click="minusFreeParam(index+1)">
         <el-icon><Minus /></el-icon>
       </span>
     </div>
   </template>
 </el-form-item>
</el-form>
 
// ---------js
import { reactive } from 'vue'
const form = reactive({
  free_param: []
})
const validateName = (rule, value, callback) => { // 只允许输入英文/标点符号/数字
  const title= /^[0-9\a-\z\A-\Z]|["',，.。/、\]\[【】\\n\s！!?？——_<>%;‘’；)《（）》(&+=`“”·*#@@]/
  const zh = /[\u4e00-\u9fa5]$/
  const data = value.every((item) => {
    if (!title.test(item) || zh.test(item)) {
      callback(new Error('仅支持输入英文、标点符号、数字'))
    } else {
      return true
    }
  })
  if (data) callback()
}
const rules = reactive({
  free_param: [
    { required: true, message: '仅支持输入英文、标点符号、数字', trigger: 'blur' },
    { max: 10, validator: validateName, trigger: 'blur' }
  ]
})

const addFreeParam = (val) => {
  // 若有空值，则不允许再次添加输入框
  let flag = true
  form.free_param.forEach((item) => {
    if (!item.trim()) flag = false
  }) 
  if (!flag) return
  form.free_param.push('')
}
const minusFreeParam = (index) => {
  form.free_param.splice(index, 1)
}

// ---------------css
.free-param {
  .el-form-item__content {
    .free-param-one {
      display: flex;
      width: 100%;
    }
    .free-param-one+.free-param-one {
      margin-top: 10px;
    }
    .el-icon {
      font-size: 22px;
      margin-left: 5px;
      height: 100%;
      cursor: pointer;
    }
  }
}

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el-select

1.el-select自定义模板添加全选功能

因需求需要，对element-plus select选择器做了一点改动

<!-- 全选选择器组件 -->
<template>
  <el-select v-model="selectValue"
    :filterable="filterable"  // 可搜索
    :multiple="multiple"	 // 可多选
    :collapse-tags="collapseTags" // 多选时是否将选中值按文字的形式展示
    :collapse-tags-tooltip="collapseTags && collapseTagsTooltip" // 当鼠标悬停于折叠标签的文本时，是否显示所有选中的标签。 要使用此属性，collapse-tags属性必须设定为 true
    :default-first-option="defaultFirstOption && filterable" // 是否在输入框按下回车时，选择第一个匹配项。 需配合 filterable 或 remote 使用
    @change="$emit('selectChange', selectValue)" // 选择器改变触发父组件方法以传更改后的值
  >   
    <el-checkbox v-model="checkedBoxValue" style="width: 100%;padding-left:15px;"
      label="全选" @change="handleAllChange" />
    <el-option
      v-for="item in options"
      :key="item.key"
      :label="item.value" 
      :value="item.key"
    >
      <span>{{ item.value }}</span>
    </el-option>
  </el-select>

</template>
<script setup>
const props = defineProps({
  options: {
    type: Array,
    default: []
  },
  filterable: {
    type: Boolean,
    default: true
  },
  multiple: {
    type: Boolean,
    default: true
  },
  collapseTags: {
    type: Boolean,
    default: true
  },
  collapseTagsTooltip: {
    type: Boolean,
    default: true
  },
  defaultFirstOption: {
    type: Boolean,
    default: true
  }
})
const checkedBoxValue = ref(true) // 【全选】默认为选中状态
const selectValue = ref([])
const emits = defineEmits(['selectChange'])
const handleAllChange = (val) => {
  if (checkedBoxValue.value) {
    selectValue.value = props.options.map(item => {
      return item.key // 可以修改【全选】时下方选项的状态
    })
    // 点击【全选】触发更改事件
    emits('selectChange', selectValue.value)
  } else {
    selectValue.value = []
    emits('selectChange', selectValue.value)
  }
}
watchEffect((val) => { // 初始监听数据
  if(checkedBoxValue.value) {
    selectValue.value = props.options.map(item => {
      return item.key
    })
  }
})
watch(
  selectValue,
  (newValue) => {
    checkedBoxValue.value = newValue.length === props.options.length
  }
)
</script>
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使用：

 <el-form-item label="病理指标">
   <pathology-select
     :options="pathologyOptions"
     ref="projectSelectRef"
     @selectChange="pathologyChange"
   />
 </el-form-item>
 const pathologyOptions = reactive([{key: 0, value: '第一个'},{key: 1, value: '第二个'},{key: 2, value: '第三个'},{key: 3, value: '第四个'},{key: 4, value: '第五个'},{key: 5, value: '第六个'}])
 const pathologyChange = (val) => {
 	console.log(val)
 }
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效果如下

QQ录屏20220714150507

popover

1、popover与tooltip组合使用

 <el-tooltip
    effect="light"
    content="快捷键说明"
    placement="left"
    :append-to-body="false">
    <el-icon :size="18"
    class="button"
      ref="ShortcutKeyRef" // 为了popover中的virtual-ref字段
      @click.stop="ShortcutKey = true">
      <QuestionFilled />
    </el-icon>
  </el-tooltip>
  <el-popover
    effect="light" trigger="click"
    placement="left"
    :virtual-ref="ShortcutKeyRef" // 需与tooltip中的ref组合使用
    virtual-triggering  // 加上该字段可以不显示ElementPlusError: [ElOnlyChild] no valid child node found的警告
  > 
   <div>
     <b>快捷键说明</b>
     <el-icon @click="ShortcutKey = false"><Close /></el-icon>
   </div>
  </el-popover>

const ShortcutKey = ref(false)
const ShortcutKeyRef = ref()
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step

场景：表格内，每个步骤条单独的颜色显示。(使用Step 属性的 status)
如图所示

html：
<el-table
     :data="sliceList"
     v-loading="loading"
 >
     <el-table-column label="新切片编号" prop="newSliceId" width="100"></el-table-column>
     <el-table-column label="项目名称" prop="projectName" width="150"></el-table-column>
     <el-table-column label="分析诊断进度" prop="progress">
         <template #default="scope">
             <el-steps align-center >
                 <template v-for="item in scope.row.progress">
                     <el-step :title="item.stayName"
                         :status="item.color"/>
                 </template>
             </el-steps>
         </template>
     </el-table-column>
 </el-table>

js:
step的status属性对应颜色'wait灰色' | 'process黑色' | 'finish蓝色' | 'error红色' | 'success绿色'
sliceList.value = [
    { newSliceId: '新切片编号1',  projectName: '项目名称1', progress: [
        { stayName: '待分析', color: 'finish' },
        { stayName: 'AI分析中', color: 'wait' },
        { stayName: 'AI分析成功', color: 'wait' },
        { stayName: '人工诊断', color: 'wait' },
    ] },
    { newSliceId: '新切片编号2',  projectName: '项目名称1', progress: [
        { stayName: '待分析', color: 'finish' },
        { stayName: 'AI分析中', color: 'finish' },
        { stayName: 'AI分析成功', color: 'wait' },
        { stayName: '人工诊断', color: 'wait' },
    ] },
    { newSliceId: '新切片编号3', projectName: '项目名称1', progress: [
        { stayName: '待分析', color: 'finish' },
        { stayName: 'AI分析中', color: 'finish' },
        { stayName: 'AI分析成功', color: 'success' },
        { stayName: '人工诊断', color: 'wait' },
    ] },
    { newSliceId: '新切片编号4', projectName: '项目名称1', progress: [
        { stayName: '待分析', color: 'finish' },
        { stayName: 'AI分析中', color: 'finish' },
        { stayName: 'AI分析失败', color: 'error' },
        { stayName: '人工诊断', color: 'wait' },
    ] },
    { newSliceId: '新切片编号5', projectName: '项目名称1', progress: [
        { stayName: '待分析', color: 'finish' },
        { stayName: 'AI分析中', color: 'finish' },
        { stayName: 'AI分析成功', color: 'success' },
        { stayName: '人工诊断', color: 'process' },
    ] },
    { newSliceId: '新切片编号6', projectName: '项目名称1', progress: [
        { stayName: '待分析', color: 'finish' },
        { stayName: 'AI分析中', color: 'finish' },
        { stayName: 'AI分析失败', color: 'error' },
        { stayName: '人工诊断', color: 'process' },
    ] },
    { newSliceId: '新切片编号7', projectName: '项目名称1', progress: [
        { stayName: '待分析', color: 'finish' },
        { stayName: '人工诊断', color: 'process' },
    ] }
]

css:(把process默认的黑色改为黄色了)
:deep(.el-table) {
	.el-step {
        .el-step__head.is-process {
            .is-text {
                border-color: 	#FFD700;
            }
            .el-step__icon-inner {
                color: 	#FFD700;
            }
            .el-step__title {
                color: 	#FFD700;
            }
        }
        .el-step__title.is-process {
            color: 	#FFD700;
        }
    }
}
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tree

半选中的id默认没有在getCheckedKeys中，需要使用getHalfCheckedKeys

<el-form
   ref="roleFormRef"
   :model="formData"
   :rules="formRules"
>
   <el-form-item label="功能权限" prop="menuIds">
       <el-tree
           :data="menuOptions"
           show-checkbox
           ref="roleTreeRef"
           node-key="menuId"
           @check="checkChangeHandle"
           empty-text="加载中，请稍候"
           :props="{ label: 'menuName', children: 'children' }"
       ></el-tree>
   </el-form-item>
</el-form>

const formData = reactive({
    remark: '',
    menuIds: ''
})
const menuOptions = ref([0, 2, 3, 4, 5])
function checkChangeHandle(a: any, b: any) {
    formData.menuIds = b.checkedKeys
}
async function editRoleHandle(row: SubjectRole) {
    let treeData:any = []
    await getEditRoleTree(row.roleId)
        .then((res: any) => {
            treeData = res.data.checkedKeys  // 后端返回选中的id
            menuOptions.value = res.data.menus // 后端返回全部的id
        })
        .catch(err => console.log(err))
    treeData.forEach((item: number) => {
        nextTick(() => {
            roleTreeRef.value.setChecked(item, true, false) // 回显
        })
    })
    formData.menuIds = treeData
}

function submitForm(formEl: FormInstance | unpostSliceListdefined) {
    formEl.validate((valid: any) => {
        if (valid) {
            let getCheckId = roleTreeRef.value.getCheckedKeys() // 被选中的菜单节点
            let halfCheckedKeys = roleTreeRef.value.getHalfCheckedKeys()  // 半选中的菜单节点
            getCheckId.unshift.apply(getCheckId, halfCheckedKeys)
            formData.menuIds = getCheckId
        } else {
            console.log('error submit!')
        }
    })
}
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二级tree过滤时，默认不显示二级的内容

在这里插入图片描述

下方代码可解决搜索时不显示下级的问题

<el-tree
    :data="filterProjectList"
    :filter-node-method="filterNode"
 >
function filterNode(value: string, data: any, node: any) {
  /* if (!value) return true
  return data.label.includes(value) */
  // 上方的方式el-tree默认会不显示下级
  let parentNode = node.parent; // 父级node
  let labels = [node.label]; // 当前node的名字
  let level = 1; // 层级
  while (level < node.level) {
    labels = [...labels, parentNode.label]; // 当前node名字，父级node的名字
    parentNode = parentNode.parent;
    level++;
  }
  return labels.some((d) => d.indexOf(value) !== -1);
}
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