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/
{
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",duration: 1000
});
this.setData({
isFocus: true,});
});
}
},
/点赞/
{
wx.showToast({
title: "点赞取消",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",duration: 1000
});
itemDetail.liked++;
this.setData({
itemDetail: itemDetail
});
this.setData({
isLike: true,
取消点赞功能
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!