1.新建分支
git branch—git checkout -b goods_params----git push -u origin goods_params
2.新建路由Params并导入
3.面包屑导航区

<!--面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

4.卡片视图区域

<el-card>
      <el-alert show-icon :closable="false" title="注意：只允许为第三级分类设置参数" type="warning"> </el-alert>
    </el-card>

5.级联选择框的数据渲染
Cascader 级联选择器

<!--卡片视图区域-->
    <el-card>
      <el-alert
        show-icon
        :closable="false"
        title="注意：只允许为第三级分类设置参数"
        type="warning"
      >
      </el-alert>
      <!--选择商品分类区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!--选择商品分类的级联选择框-->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
    </el-card>

data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择器的双向绑定
      selectedCateKeys: []
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.catelist = res.data
    },
    // 级联选择框选中变化会触发这个函数
    handleChange() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        return this.$message.error('选中的不是三级分类')
      }
      // 证明选中的是三级分类
      console.log('123')
    }
  }

6.渲染分类参数页的Tab页签

 <!--商品页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="first">用户管理</el-tab-pane>
        <el-tab-pane label="静态属性" name="second">配置管理</el-tab-pane>
      </el-tabs>

// tab页签点击事件的处理函数
    handleTabClick () {
      console.log(this.activeName)
    }

7.渲染添加参数按钮并控制它的启用和禁用

<!--商品页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--添加动态参数页面-->
        <el-tab-pane label="动态参数" name="first">
          <el-button :disabled="isBtnDisabled" type="primary" size="mini">添加参数</el-button>
        </el-tab-pane>
        <!--添加静态属性页面-->
        <el-tab-pane label="静态属性" name="second">
          <el-button :disabled="isBtnDisabled" type="primary" size="mini">添加属性</el-button>
        </el-tab-pane>

与methods同级

computed: {
    // 如果按钮需要被禁用
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    }
  }

8.获取参数列表

<!--商品页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--添加动态参数页面-->
        <el-tab-pane label="动态参数" name="many">
          <el-button :disabled="isBtnDisabled" type="primary" size="mini"
            >添加参数</el-button
          >
          <!--动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand"></el-table-column>
            <!--索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit"
                  >编辑</el-button
                >
                <el-button type="danger" size="mini" icon="el-icon-delete"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--添加静态属性页面-->
        <el-tab-pane label="静态属性" name="only">
          <el-button :disabled="isBtnDisabled" type="primary" size="mini"
            >添加属性</el-button
          >
          <!--静态属性表格-->
          <el-table :data="onlyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand"></el-table-column>
            <!--索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit"
                  >编辑</el-button
                >
                <el-button type="danger" size="mini" icon="el-icon-delete"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>

 methods: {
    // 获取所有商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    // 级联选择框选中变化会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        return this.$message.error('选中的不是三级分类')
      }
      // 证明选中的是三级分类
      console.log(this.selectedCateKeys)
      // 根据所选分类的id和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    }
  },
  computed: {
    // 如果按钮需要被禁用
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    }
  }

9.添加按钮功能实现

<!--添加参数对话框-->
    <el-dialog
      :title="'添加' + titelText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!--添加参数对话框的表单-->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titelText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addDialogVisible = false"
          >确 定</el-button
        >
      </span>
    </el-dialog>

10.调用api实现添加功能
为确定按钮绑定事件addParams

// 点击按钮 添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('验证失败')
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    }

11.修改和删除功能

<!--编辑参数对话框-->
    <el-dialog
      :title="'修改' + titelText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!--编辑参数对话框的表单-->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titelText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>

 // 点击修改，展示修改的对话框
    async showEditDialog(attr_id) {
      // 查询当前参数id
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
        params: { attr_sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('查询参数失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮 修改参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return this.$message.error('校验失败')
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    // 根据id删除参数项
    async removeParams (attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消了操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消了操作')
      }

      // 删除
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
    }