怎么把项目中数组转变为字符串

Question

energyType这个参数后台没法接数组，要改成字符串才行，

<el-form-item label="营运类型" prop="energyType">
          <el-select v-model="searchForm.energyType" multiple placeholder="请选择">
            <el-option label="公路客运" value="1" />
            <el-option label="公路货运" value="2" />
            <el-option label="出租客运" value="3" />
            <el-option label="公交公司" value="4" />
            <el-option label="水路客运" value="5" />
            <el-option label="港口企业" value="6" />
          </el-select>
        </el-form-item>
data() {
    return {
      searchForm: {
        year: undefined,
        period: undefined,
        type: [],
        carNumber: undefined,
        shipName: undefined,
        workDay: undefined,
        startPage: 1,
        pageSize: this.$pageSize,
        energyType:[]
      },
}}

怎么把energyType变为字符串，用，链接

Answer 1

energyType.join(',')