微信小程序实现购物时限购商品的数量（附代码）

<view class=”num-box”>

<view class=系统开发mhkj33“weui-media-box__bd”>

<view class=”promotion-sku clear”>

<view class=”Spinner”>

<a wx:if=”{{goods_count系统开发mhkj33==1}}” class=”DisDe”>

<i bindtap=”minusCount” data-index=”{{index}}” class=”DisDe”>-</i>

</a>

<a wx:if=系统开发mhkj33“{{goods_count>1}}” class=”Decrease”>

<i bindtap=”minusCount” data-index=”{{index}}” class=”DisDe”>-<系统开发mhkj33/i>

</a>

<view>

<input class=”Amount” bindinput=”changeCount” type=&#39;number&#39; value=”{{goods_coun系统开发mhkj33t}}” autocomplete=”off” maxlength=”3″  data-submit_type=”{{submit_type}}” />

</view>

<a class=”Increas系统开发mhkj33e”>

<i bindtap=”addCount” data-index=”{{index}}” data-submit_type=”{{submit_type}}”>+</i>

</a>                  

</view>

<系统开发mhkj33/view>

</view>

</view>

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// 增加数量

addCount(e) {

/系统开发mhkj33/ 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_cou系统开发mhkj33nt;

goods_count = parseInt(goods_count) + 1;

//debugger

if (submit_type == 2) {  // 拼团购买

var limited_num系统开发mhkj33 = this.data.collage.limited_num;

if (goods_count > limited_num) {

this.showTip(&#39;超出限购&#39;);

return系统开发mhkj33;

}

}

this.setData({

goods_count: goods_count

});

},

// 改变数量(input内的值)

changeCount(e) {

var goods_count = e.d系统开发mhkj33etail.value;

let submit_type = e.target.dataset.submit_type;

if (submit_type == 1) {

var sys_num = this系统开发mhkj33.data.goods_num;

if (goods_count > sys_num) {  // 单独购买

this.showTip(&#39;库存不足&#39;);

return;

}

} else if 系统开发mhkj33(submit_type == 2) {  // 拼团购买

var limited_num = this.data.collage.limited_num;

if (goods_count > limit系统开发mhkj33ed_num) {

this.showTip(&#39;超出限购&#39;);

return;

}

}

if (!(/^[\d]+\.?\d*$/.test(goods_count))) {

goods_coun系统开发mhkj33t = goods_count.replace(/\D/g, &#39;&#39;);

return goods_count ? goods_count : 1;

}

if (goods_count < 1系统开发mhkj33) {

return 1;

}

this.setData({

goods_count: goods_count

});

},

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