外层循环正常嵌套，内层循环嵌套的时候，把item.swiper_buy作为数组循环wx:for="{{item.swiper_buy}}"，然后给item重新命名wx:for-item="cell"，内部循环的时候，就是{{cell.属性}}

block wx:for="{{swiper_object}}" wx:key="index"
    swiper-item
      view class='swiper_in'
        view class='head_img'
          image src="{{item.head_img}}"/image
          view class='head_in'
            view class='card_name'嘻哈帮街舞.{{item.card_name}}/view
            view class="card_i"{{item.card_use}}/view
            view class='use_region'{{item.card_region}}/view
          /view
        /view
        view class='buy_list'
          block wx:for="{{item.swiper_buy}}" wx:for-item="cell" wx:key="index"
            view class="buy_item {{num==index?'current':''}}"   data-index="{{index}}" catchtap='switchTab'
              view class='buy_price'
                view class='card_price'¥{{cell.buy_price}}/view
                view class='nk_species'{{cell.card_species}}/view
              /view
              view class='buy_zs'{{cell.buy_send}}/view
            /view
          /block
        /view
      /view
    /swiper-item
    /block

data: {

    num: 0,

    swiper_object:[

      {

        swiper_buy: [

          {

            buy_price: "1100",

            card_species: "年卡D",

            buy_send: "购买1课点"

          },

          {

            buy_price: "2200",

            card_species: "年卡C",

            buy_send: "购买9课点"

          },

          {

            buy_price: "3300",

            card_species: "年卡B",

            buy_send: "购买3课点"

          }

        ],

        head_img:"../../images/head_img1.png",

        card_name:"次卡",

        card_use:"49/课点",

        card_region:"本课点全国通用"

      },

      {

        swiper_buy: [

          {

            buy_price: "1400",

            card_species: "一年通",

            buy_send: "有效期内享受日课程课"

          },

          {

            buy_price: "2500",

            card_species: "两年通",

            buy_send: "有效期内享受日课程课"

          },

          {

            buy_price: "46000",

            card_species: "单店通",

            buy_send: "赠本企业续存期内"

          }

        ],

        head_img: "../../images/head_img2.png",

        card_name: "少儿畅舞卡",

        card_use: "本地使用",

        card_region: "有效期内可以享受日常课"

      },

    ]

  }