微信小程序实现购物时限购商品的数量（附代码）

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// 增加数量  addCount(e) {    // 购买类型，单独购买或拼团购买    let submit_type = e.target.dataset.submit_type;    var goods_count = this.data.goods_count;    goods_count = parseInt(goods_count) + 1;    //debugger    if (submit_type == 2) {  // 拼团购买      var limited_num = this.data.collage.limited_num;      if (goods_count &gt; limited_num) {        this.showTip('超出限购');        return;      }    }    this.setData({      goods_count: goods_count    });  },// 改变数量(input内的值)  changeCount(e) {    var goods_count = e.detail.value;    let submit_type = e.target.dataset.submit_type;    if (submit_type == 1) {      var sys_num = this.data.goods_num;      if (goods_count &gt; sys_num) {  // 单独购买        this.showTip('库存不足');        return;      }    } else if (submit_type == 2) {  // 拼团购买      var limited_num = this.data.collage.limited_num;      if (goods_count &gt; limited_num) {        this.showTip('超出限购');        return;      }    }    if (!(/^[d]+.?d*$/.test(goods_count))) {      goods_count = goods_count.replace(/D/g, '');      return goods_count ? goods_count : 1;    }    if (goods_count <p>