自己的第一个点餐小程序，主要包括左右菜单联动、点击数量加减、菜单和购物车数量可以同步加减、购物车动画等，纯前端实现
大致的功能样式如下图展示：
代码块
主要代码块：
// 点击左侧分类切换右侧菜品
changeRightMenu: function (e) {
var classify = e.target.dataset.id;// 获取点击项的id
var foodList = this.data.foodList;
var allFoodList = this.data.allFoodList;
var newFoodList = [];
if (classify == 0) {//选择了全部选项
this.setData({
curNav: classify,
foodList: allFoodList
})
} else { //选择了其他选项
for (var i in allFoodList) {
if (allFoodList[i].catid == classify) {
newFoodList.push(allFoodList[i])
}
}
this.setData({
// 右侧菜单当前显示第curNav项
curNav: classify,
foodList: newFoodList
})
}
},
// 购物车及菜单中增加数量
addCount: function (e) {
var id = e.currentTarget.dataset.id;[这里写链接内容](/download/m0_37543652/10019843%20%20%E6%BA%90%E7%A0%81%E4%B8%8B%E8%BD%BD%E5%9C%B0%E5%9D%80)
var arr = wx.getStorageSync('cart') || [];
var f = false;
for (var i in this.data.foodList) {// 遍历菜单找到被点击的菜品，数量加1
if (this.data.foodList[i].id == id) {
this.data.foodList[i].quantity += 1;
if (arr.length > 0) {
for (var j in arr) {// 遍历购物车找到被点击的菜品，数量加1
if (arr[j].id == id) {
arr[j].quantity += 1;
f = true;
try {
wx.setStorageSync('cart', arr)
} catch (e) {
console.log(e)
}
break;
}
}
if (!f) {
arr.push(this.data.foodList[i]);
}
} else {
arr.push(this.data.foodList[i]);
}
try {
wx.setStorageSync('cart', arr)
} catch (e) {
console.log(e)
}
break;
}
}
this.setData({
cartList: arr,
foodList: this.data.foodList
})
this.getTotalPrice();
},
// 定义根据id删除数组的方法
removeByValue: function (array, val) {
for (var i = 0; i < array.length; i++) {
if (array[i].id == val) {
array.splice(i, 1);
break;
}
}
},
// 购物车减少数量
minusCount: function (e) {
var id = e.currentTarget.dataset.id;
var arr = wx.getStorageSync('cart') || [];
for (var i in this.data.foodList) {
if (this.data.foodList[i].id == id) {
this.data.foodList[i].quantity -= 1;
if (this.data.foodList[i].quantity <= 0) {
this.data.foodList[i].quantity = 0;
}
if (arr.length > 0) {
for (var j in arr) {
if (arr[j].id == id) {
arr[j].quantity -= 1;
if (arr[j].quantity <= 0) {
this.removeByValue(arr, id)
}
if (arr.length <= 0) {
this.setData({
foodList: this.data.foodList,
cartList: [],
totalNum: 0,
totalPrice: 0,
})
this.cascadeDismiss()
}
try {
wx.setStorageSync('cart', arr)
} catch (e) {
console.log(e)
}
}
}
}
}
}
this.setData({
cartList: arr,
foodList: this.data.foodList
})
this.getTotalPrice();
},
如果觉得《外卖点餐列表滑动 微信小程序_点餐小程序购物车效果实现 点餐小程序购物车列表的实现...》对你有帮助，请点赞、收藏，并留下你的观点哦！
