本文介绍了小程序点赞收藏功能的实现代码示例，分享给大家，具体如下：
/收藏/
focusFavoriteTab: function (e) {
var that = this;
var isFocus = that.data.isFocus;
console.log("isFocus", isFocus)
var itemId = that.data.itemId;
if (isFocus) {
favoriteService.cancel(that, itemId).then((res) => {
wx.showToast({
title: "取消收藏",
icon: 'success',
duration: 1000
});
this.setData({
isFocus: false,
});
})
} else {
favoriteService.add(that, itemId).then((res) => {
wx.showToast({
title: res.data == 1 ? "收藏成功" : "收藏失败",
icon: 'success',
duration: 1000
});
this.setData({
isFocus: true,
});
});
}
},
/点赞/
focuslikeTab: function (e) {
var that = this;
var isLike = that.data.isLike;
let itemDetail = this.data.itemDetail
var itemId = that.data.itemId;
if (isLike) {
itemService.cancellike(that, itemId).then((res) => {
wx.showToast({
title: "点赞取消",
icon: 'success',
duration: 1000
});
itemDetail.liked--;
this.setData({
itemDetail:itemDetail
});
this.setData({
isLike: false,
});
})
} else {
itemService.addlike(that, itemId).then((res) => {
wx.showToast({
title: res.data == 1 ? "点赞成功" : "点赞失败",
icon: 'success',
duration: 1000
});
itemDetail.liked++;
this.setData({
itemDetail: itemDetail
});
this.setData({
isLike: true,
});
});
}
},
取消点赞功能
/*更新点赞*/
update_zan:function(e){
var that = this;
var data = e.currentTarget.dataset;
var mid = data.mid;
var cookie_mid = wx.getStorageSync('zan') || [];//获取全部点赞的mid
var isadd = 1;
var newmessage = [];
if (cookie_mid.includes(mid)){//说明已经点过赞,取消赞
isadd = 0;
var m = 0;
for (var j in cookie_mid){
if(cookie_mid[j] != mid){
newmessage[m] = cookie_mid[j];
m++
}
}
wx.setStorageSync('zan', newmessage);//删除取消赞的mid
}else{
cookie_mid.unshift(mid);
wx.setStorageSync('zan', cookie_mid);//新增赞的mid
}
wx.request({
url: app.globalData.api.api_system,
data: {
action: 'zannum',
mid: mid,
isadd: isadd,
wxid: app.globalData.wxid
},
method: 'GET',
// header: {},
success: function (res) {
var message = that.data.message;
for (var i in message) {
if(message[i].mid == mid){
if(isadd){
message[i].zan = parseInt(message[i].zan) + 1
}else{
message[i].zan = parseInt(message[i].zan) - 1
}
}
}
that.setData({
message: message
})
}
})
重点注意代码：
（1）要把所有已经点过赞的留言id给存储到本地缓存之中，这样如果重复点赞的，就可以判断出来，并取消点赞，取消点赞的同时要去掉缓存中的id；
（2）新增点赞和取消点赞用到同一个api，通过isadd=1或者isadd=0来判断是新增还是取消点赞
（3）为了不频繁去读取留言列表，可以直接调用this.data.message,并通过循环遍历改变某个留言的点赞数，然后直接重新赋值，就能动态改变点赞数！
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
