his-answer/src/pages/FormVolume/mixins/custom.js

const config = {
  slider (item) {
    item.sliderVal = -1
    // 大于 5 个选项， 取3个值
    if (item.content.length > 5) {
      let a = 0
      let b = (item.content.length / 2 >> 0) - 1
      let c = item.content.length - 1
      let r = [a, b, c]
      item.content.forEach((it, i) => it.sliderHide = r.indexOf(i) === -1)
    }
    return item
  }
}

export default function (item) {
  let fn = config[item.type]
  return fn && fn(item)
}