控制 el-checkbox-group 只能单选

<el-checkbox-group v-model="options" @change="searchChange">
  <el-checkbox label="New Products">New Products</el-checkbox>
  <el-checkbox label="Eco-Friendly Products">Eco-Friendly Products</el-checkbox>
  <el-checkbox label="Best Sellers">Best Sellers</el-checkbox>
</el-checkbox-group>

searchChange() {
  if (this.options.length > 1) {
    this.options.splice(0, 1)
  }
},