如何在微信小程序中实现一个购物车功能？很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
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onShow: function () {
const cart = wx.getStorageSync("cart");
let address = wx.getStorageSync("address") ;
console.log(address);
this.setData({
address, cart
})
this.loadCarts();
this.countAll();
}点击按钮更改购物车的数量：
handleNumEdit(e) {
const { operator, goodsid } = e.target.dataset;
let { cart } = this.data;
cart[goodsid].count += (+operator);
if (cart[goodsid].count < 1) {
cart[goodsid].count = 1;
wx.showModal({
title: '提示',
content: '您确定要删除吗',
showCancel: true,
cancelText: '取消',
cancelColor: '#000000',
confirmText: '确定',
confirmColor: '#3CC51F',
success: (result) => {
if (result.confirm) {
delete cart[goodsid];
this.loadCarts();
this.countAll();
} else {
}
}
});
} else if (cart[goodsid].count > cart[goodsid].goods_number) {
cart[goodsid].count = cart[goodsid].goods_number;
wx.showToast({
title: '没有库存了',
icon: 'none',
duration: 1500,
mask: true
});
}
this.loadCarts();
this.countAll();
}加载购物车数据的方法：
data: {
cart: {},
address: {},
totalPrice: 0,
categoryLength: 0,
isAllChecked: true
},单个商品被选中时触发：
loadCarts() {
let { cart } = this.data;
let isAllChecked = true;
for (const key in cart) {
if (cart.hasOwnProperty(key)) {
const element = cart[key];
if (!element.isChecked) {
isAllChecked = false;
break;
}
}
}
this.setData({
cart,
isAllChecked
});
},全选和反选触发的事件：
handleItemChecked(e) {
let { goodsid } = e.target.dataset;
let { cart } = this.data;
let { isChecked } = cart[goodsid];
cart[goodsid].isChecked = !isChecked;
let checkedLength = 0;
for (const key in cart) {
if (cart.hasOwnProperty(key)) {
if (cart[key].isChecked) {
checkedLength++;
}
}
}
const isAllChecked = checkedLength == Object.keys(cart).length;
this.countAll();
this.setData({
isAllChecked
})
},点击结算时触发：
handleItemAllChecked() {
let { isAllChecked } = this.data;
let { cart } = this.data;
isAllChecked = !isAllChecked;
for (const key in cart) {
if (cart.hasOwnProperty(key)) {
cart[key].isChecked = isAllChecked;
}
}
this.setData({
isAllChecked,
cart
})
this.countAll();
},看完上述内容是否对您有帮助呢？如果还想对相关知识有进一步的了解或阅读更多相关文章，请关注创新互联行业资讯频道，感谢您对创新互联的支持。
