小程序公共对象
app.js
App({
/**
* 当小程序初始化完成时,会触发 onLaunch(全局只触发一次)
*/
onLaunch: function () {
},
globalData:{
userInfo: null,
}
})
其他页面操作公共值
var app = getApp();
Page({
data: {
},
onShow:function(){
app.globalData
}
});
注意:修改globalData之后,其他页面以用的值不会自动变化,而是需要手动设置。
本地存储操作
wx.getStorageSync('userInfo');
wx.setStorageSync('userInfo',"sdfsfd");
wx.removeStorageSync("userInfo")
页面调用栈
var pages = getCurrentPages();
prevPage = pages[pages.length-2];
跳转回上一个页面
wx.navigateBack({});
小程序页面的生命周期
全局app.js
App({
/**
* 当小程序初始化完成时,会触发 onLaunch(全局只触发一次)
*/
onLaunch: function () {
},
globalData:{
userInfo: null,
}
})
wx:if指令
父页面:
/pages/xx/xxx?id=1
子页面
onLoad:function(option){
}
子页面
var pages = getCurrentPages();
var prevPage = pages[pages.length-2];
// prevPage.setData({ topicText:topicInfo.title });
注意:data-xx 可以给事件传值。
方式一
1. 打开图片进行本地预览
2. 输入文字 & 选择相应的信息
3. 点击发布按钮
3.1 将本地图片上传到 腾讯云对象存储中COS(oss),并将COS中的图片地址返回。
3.2 将COS中的图片URL和文字等信息一起提交到后台。
BUG:
在3.2步骤时可能拿不到COS中的图片。
function onClickSubmit(){
// 耗时1分钟,不会阻塞。
wx.request({
url:"...",
success:function(res){
console.log(res)
}
})
console.log(123);
}
方式二(推荐)
1. 打开图片进行本地预览
2. 将本地图片上传到 腾讯云对象存储中COS
3. 输入文字 & 选择相应的信息
4. 发布:
必须上传完毕之后,才允许点击发布按钮。
<progress percent="{{percent1}}" ></progress>
<progress percent="{{percent2}}" activeColor="#DC143C" ></progress>
<view>-----案例------view>
<view>点击按钮完成,将图片1的进度条更新为80%view>
<view wx:for="{{imageList}}">
<view>{{item.title}}view>
<progress percent="{{item.percent}}" >progress>
view>
<button bindtap="changePercent" >点击button>
data: {
percent1:20,
percent2:50,
imageList:[
{id:1,title:"图片1",percent:20},
{ id: 1, title: "图片2", percent: 30 },
{ id: 1, title: "图片3", percent: 60 },
]
},
changePercent:function(){
// 方式1:错误
/*
this.setData({
imageList[0].person: 80
});
*/
// 方式2:可以,由于需要全部修改,所以性能差。
/*
var dataList = this.data.imageList;
dataList[0].percent = 80;
this.setData({
imageList: dataList
});
*/
// 方式3:推荐
var num = 2;
this.setData({
["imageList[0].percent"]:80,
["imageList[" + num + "].percent"]: 90,
["imageList[1].title"]:"突突突突突"
})
},
var dataList = ["alex", "changxin", "cck"]
for (var i in dataList) {
(function(data){
wx.request({
url: 'xxxxx',
success: function (res) {
console.log(data);
}
})
})(dataList[i])
}
选图片
填内容
提交
{
cover:"https://mini-1251317460.cos.ap-chengdu.myqcloud.com/08a9daei1578736867828.png",
content:"小程序开发太简单了",
address:"北京市",
topic:1,
images:[
"https://mini-1251317460.cos.ap-chengdu.myqcloud.com/08a9daei1578736867828.png",
"https://mini-1251317460.cos.ap-chengdu.myqcloud.com/08a9daei1578736867828.png"
]
}
{
cover:"https://mini-1251317460.cos.ap-chengdu.myqcloud.com/08a9daei1578736867828.png",
content:"小程序开发太简单了",
address:"北京市",
topic:1,
images:[
{
path:"https://mini-1251317460.cos.ap-chengdu.myqcloud.com/08a9daei1578736867828.png",
cos_key:"08a9daei1578736867828.pn"
},
{
path:"https://mini-1251317460.cos.ap-chengdu.myqcloud.com/08a9daei1578736867828.png",
cos_key:"08a9daei1578736867828.pn"
},
]
}
from rest_framework.views import APIView
from rest_framework.generics import CreateAPIView
from rest_framework import serializers
from apps.api import models
class NewsDetailModelSerializer(serializers.Serializer):
key = serializers.CharField()
cos_path = serializers.CharField()
class NewsModelSerializer(serializers.ModelSerializer):
images = NewsDetailModelSerializer(many=True)
class Meta:
model = models.News
fields = "__all__"
class NewsView(CreateAPIView):
""" 创建动态的API """
serializer_class = NewsModelSerializer
class News(models.Model):
"""
动态
"""
cover = models.CharField(verbose_name='封面', max_length=128)
content = models.CharField(verbose_name='内容', max_length=255)
topic = models.ForeignKey(verbose_name='话题', to='Topic', null=True, blank=True)
address = models.CharField(verbose_name='位置', max_length=128, null=True, blank=True)
user = models.ForeignKey(verbose_name='发布者', to='UserInfo', related_name='news')
favor_count = models.PositiveIntegerField(verbose_name='赞数', default=0)
viewer_count = models.PositiveIntegerField(verbose_name='浏览数', default=0)
comment_count = models.PositiveIntegerField(verbose_name='评论数', default=0)
create_date = models.DateTimeField(verbose_name='创建时间', auto_now_add=True)
class NewsDetail(models.Model):
"""
动态详细
"""
key = models.CharField(verbose_name='腾讯对象存储中的文件名', max_length=128, help_text="用于以后在腾讯对象存储中删除")
cos_path = models.CharField(verbose_name='腾讯对象存储中图片路径', max_length=128)
news = models.ForeignKey(verbose_name='动态', to='News')
{
k1:v1,
k2:v2,
k3:{...},
k4:[
{....}
]
}
from rest_framework.response import Response
class UserModelSerializer(serializers.ModelSerializer):
class Meta:
model = models.UserInfo
fields = "__all__"
class UserView(APIView):
def get(self,request,*args,**kwargs):
user_list = models.UserInfo.objects.all()
ser = UserModelSerializer(instance=user_list,many=True)
return Response(ser.data)
def post(self,request,*args,**kwargs):
ser = UserModelSerializer(data=request.data)
if ser.is_valid():
# models.UserInfo.objects.create(**ser.validated_data)
ser.save(user_id=1)
return Response(ser.data)
return Response(ser.errors)
ListAPIView,CreateAPIView,RetrieveAPIView,UpdateAPIView,DestroyAPIView
class NewTestModelSerializer(serializers.ModelSerializer):
class Meta:
model = models.News
fields = "__all__"
class NewTestView(CreateAPIView,ListAPIView):
serializer_class = NewTestModelSerializer
queryset = models.News.objects.filter(id__gt=4)
创建用户时,自己在后台生成一个UID。
class NewTestModelSerializer(serializers.ModelSerializer):
class Meta:
model = models.News
fields = "__all__"
class NewTestView(CreateAPIView,ListAPIView):
serializer_class = NewTestModelSerializer
queryset = models.News.objects.filter(id__gt=4)
def perform_create(self, serializer):
serializer.save(uid=str(uuid.uuid4()))
通过fields和exclude定制页面展示数据。
需求:只显示用户表的id,name,age的数据,其他不显示。
class NewTestModelSerializer(serializers.ModelSerializer):
class Meta:
model = models.News
# fields = ["id","name",'age']
# fields = "__all__"
exclude = ['gender']
class NewTestView(ListAPIView):
serializer_class = NewTestModelSerializer
queryset = models.User.objects.all()
[
{id:1,name:'xxx',age:18},
{id:1,name:'xxx',age:11},
{id:1,name:'xxx',age:99},
]
需求:数据库有5个字段,显示7个字段。
class NewTestModelSerializer(serializers.ModelSerializer):
xx = serializers.CharField(source='id')
x1 = serializers.SerializerMethodField()
class Meta:
model = models.News
# fields = "__all__"
# fields = ['id','name','age','gender','phone','xx','x1']
exclude = ['id','name']
def get_x1(self,obj):
return obj.id
class NewTestView(ListAPIView):
serializer_class = NewTestModelSerializer
queryset = models.User.objects.all()
[
{id:1,name:'xxx',age:18... xx:1,x1:1},
{id:2,name:'xxx',age:11... xx:2,x1:2},
{id:3,name:'xxx',age:99, xx:3,x1:3},
]
添加时不要,查看时候需要。
需求:编写两个接口 添加(3字段)、获取列表(5个字段)
class NewTestModelSerializer(serializers.ModelSerializer):
# phone = serializers.CharField(source='phone',read_only=True)
# email = serializers.CharField(source='email',read_only=True)
class Meta:
model = models.News
fields = "__all__"
read_only_fields = ['phone','email',]
class NewTestView(CreateAPIView, ListAPIView):
serializer_class = NewTestModelSerializer
queryset = models.User.objects.all()
添加:
{
name:'xx',
age:'19',
gender:1
}
获取:
[
{name:'xx',age:'xx',gender:'',phone:'xx',email:xxx}
]
添加时用一个serializers、列表时用一个serializers
class NewTestModelSerializer1(serializers.ModelSerializer):
class Meta:
model = models.News
fields = "__all__"
class NewTestModelSerializer2(serializers.ModelSerializer):
class Meta:
model = models.News
fields = "__all__"
class NewTestView(CreateAPIView, ListAPIView):
queryset = models.User.objects.all()
def get_serializer_class(self):
if self.request.method == 'POST':
return NewTestModelSerializer1
if self.request.method == 'GET':
return NewTestModelSerializer2
class CreateNewsTopicModelSerializer(serializers.Serializer):
key = serializers.CharField()
cos_path = serializers.CharField()
class CreateNewsModelSerializer(serializers.ModelSerializer):
imageList = CreateNewsTopicModelSerializer(many=True)
class Meta:
model = models.News
exclude = ['user', 'viewer_count', 'comment_count',"favor_count"]
def create(self, validated_data):
# 把imageList切走
image_list = validated_data.pop('imageList')
# 创建New表中的数据
news_object = models.News.objects.create(**validated_data)
data_list = models.NewsDetail.objects.bulk_create(
[models.NewsDetail(**info, news=news_object) for info in image_list]
)
news_object.imageList = data_list
if news_object.topic:
news_object.topic.count += 1
news_object.save()
return news_object
class NewsView(CreateAPIView):
"""
发布动态
"""
serializer_class = CreateNewsModelSerializer
def perform_create(self, serializer):
# 只能保存:News表中的数据()
# 调用serializer对象的save(先调用create)
new_object = serializer.save(user_id=1)
return new_object