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小程序课程笔记:解决success里面数据返回问题解决success里面数据返回问题 异步回调 箭头函数改写
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贝叶斯估计中极大似然估计、拉普拉斯平滑定理以及M-估计英文原文链接:http://www.temida.si/~bojan/probability_estimation.php 原文: Probability estimation 1 Introduction Let us assume that in an experiment we have conducted n independent trials, of which there are r successes. The rest of the trials (n-r) are failures. Examples of such experiments are tossing a coin (e.g. success is a head), throwing a dice (e.g. success is 6 on top), shooting a free throw in basketball (success is a scored point), et
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jquery -ajax学习总结一. jquery ajax学习之 成功与错误回调函数 前提:后台返回的是json格式的数据(1)success回调函数:当ajax的dataType为json时 success的data就是个json的object,直接data.msg就可以获得数据(2)success回调函数:当ajax的dataType为text时 success的data是一个json格式在字符串而不是json的Object所以这里首先需要用jQuery.parseJSON(data) 将json字符串转为json的Object再用object.msg获得数据以上两种情况都没有提到error这个回到函数,是因为它实在太变态。我们看一下这个方法error:function(XMLHttpRequest, textStatus, errorThrown) { alert(XMLHttpRequest.responseTex
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封装属于自己的JS组件1、扩展已经存在的组件 $.ajax({ type: "post", url: "/User/Edit", data: { data: JSON.stringify(postdata) }, success: function (data, status) { if (status == "success") { toastr.success('提交数据成功'); $("#tb_aaa").bootstrapTable('refresh'); } }, error: function (e) { },
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- 4.3 success 返回参数说明 参数类型说明dataObject/String/ArrayBuffer服务器返回的数据statusCodeNumber服务器返回的 HTTP 状态码headerObject服务器返回的 HTTP Response HeadercookiesArray.服务器返回的 cookies,格式为字符串数组上面我们在 success 参数中打印了返回的数据。success(res) { console.log('服务器返回的信息:',res)}打印信息格式如下:{ "data":"{"id":1,"name": "imooc"}", "header": { "Server": "nginx/1.14.0", "Date": "Thu, 10 Apr 2020 03:08:20 GMT", "Content-Type": "application/json;charset=utf-8;", "Transfer-Encoding": "chunked", "Connection": "keep-alive" }, "statusCode": 200, "cookies": [], "errMsg": "request:ok"}statusCode 为 200,说明请求成功了,后面我们再处理从服务器传回来的 data 信息就可以了。
- 5. 字面量类型保护 用字面量类型那一节的例子改造一下来介绍字面量类型保护:type Success = { success: true, code: number, object: object}type Fail = { success: false, code: number, errMsg: string, request: string}function test(arg: Success | Fail) { if (arg.success === true) { console.log(arg.object) // OK console.log(arg.errMsg) // Error, Property 'errMsg' does not exist on type 'Success' } else { console.log(arg.errMsg) // OK console.log(arg.object) // Error, Property 'object' does not exist on type 'Fail' }}代码解释:第 15 行,通过布尔字面量,将这个代码块中变量 arg 的类型限定为 Success 类型。第 18 行,通过布尔字面量,将这个代码块中变量 arg 的类型限定为 Fail 类型。
- 2.1 固定出参 2.1.1 成功{ "code":0, # 0 表示成功 "msg":"success" # success "data":{ “name”:"鞋子", "inventory":1000 }}2.1.2失败{ "code":10001, # 错误码 "msg":"库存不足" # 错误描述信息 "data":{} # 业务实体}
- 3. 构建这个项目 有了之前章节的铺垫,项目构建就变得非常容易了。我们将目录切换到 mall-aggregate 目录下,执行 mvn clean install 命令,就可以得到如下执行结果。[INFO] Scanning for projects...[WARNING][WARNING] Some problems were encountered while building the effective model for com.mic.tech:mall-web:war:1.0.0-SNAPSHOT[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: junit:junit:jar -> duplicate declaration of version (?) @ line 46, column 17[WARNING][WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.[WARNING][WARNING] For this reason, future Maven versions might no longer support building such malformed projects.[WARNING][INFO] ------------------------------------------------------------------------[INFO] Reactor Build Order:[INFO][INFO] mall-aggregate [pom][INFO] mall-account [jar][INFO] mall-commodity [jar][INFO] mall-order [jar][INFO] mall-delivery [jar][INFO] mall-web Maven Webapp [war][INFO][INFO] --------------------< com.mic.tech:mall-aggregate >---------------------[INFO] Building mall-aggregate 1.0.0-SNAPSHOT [1/6][INFO] --------------------------------[ pom ]---------------------------------[INFO] ...[INFO] ---------------------< com.mic.tech:mall-account >----------------------[INFO] Building mall-account 1.0.0-SNAPSHOT [2/6][INFO] --------------------------------[ jar ]---------------------------------[INFO] ...[INFO] --------------------< com.mic.tech:mall-commodity >---------------------[INFO] Building mall-commodity 1.0.0-SNAPSHOT [3/6][INFO] --------------------------------[ jar ]---------------------------------[INFO] ...[INFO] ----------------------< com.mic.tech:mall-order >-----------------------[INFO] Building mall-order 1.0.0-SNAPSHOT [4/6][INFO] --------------------------------[ jar ]---------------------------------[INFO] ...[INFO] ---------------------< com.mic.tech:mall-delivery >---------------------[INFO] Building mall-delivery 1.0.0-SNAPSHOT [5/6][INFO] --------------------------------[ jar ]---------------------------------[INFO] ...[INFO] -----------------------< com.mic.tech:mall-web >------------------------[INFO] Building mall-web Maven Webapp 1.0.0-SNAPSHOT [6/6][INFO] --------------------------------[ war ]---------------------------------[INFO] ...[INFO] Building war: D:\code\mall-aggregate\mall-web\target\mall-web.war[INFO] ------------------------------------------------------------------------[INFO] Reactor Summary for mall-aggregate 1.0.0-SNAPSHOT:[INFO][INFO] mall-aggregate ..................................... SUCCESS [ 0.897 s][INFO] mall-account ....................................... SUCCESS [ 2.173 s][INFO] mall-commodity ..................................... SUCCESS [ 0.191 s][INFO] mall-order ......................................... SUCCESS [ 0.192 s][INFO] mall-delivery ...................................... SUCCESS [ 0.148 s][INFO] mall-web Maven Webapp .............................. SUCCESS [ 3.331 s][INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 7.154 s[INFO] Finished at: 2020-05-09T22:55:42+08:00[INFO] ------------------------------------------------------------------------
- 3. 布尔字面量类型 声明布尔字面量类型,注意这里是 : 不是 =。 = 等号是变量赋值,: 表示声明的类型。let success: truelet fail: falselet value: true | false接口的返回值,会有正确返回和异常两种情况,这两种情况要有不同的数据返回格式:type Result = { success: true, code: number, object: object } | { success: false, code: number, errMsg: string }let res: Result = { success: false, code: 90001, errMsg: '该二维码已使用' }if (!res.success) { res.errMsg // OK res.object // Error, Property 'object' does not exist on type '{ success: false; code: number; errMsg: string; }}代码解释:类型别名 Result 是一个由两个对象组成的联合类型,都有一个共同的 success 属性,这个属性的类型就是布尔字面量类型。因为涉及很多后续才会介绍的知识点,这里看不懂没关系,只需要大概了解这是布尔字面量类型的一种应用即可。
- 1. Django 中操作 Cookie 操作 Cookie 同样是考察4个基本动作:增删改查。现在分别从这4个角度看 Django 如何操作 Cookie :增:对于视图函数或者视图类的三种返回 Response 响应 (HttpResponse、render、redircet),之前的做法是直接 return,现在可以在 return 之前,使用 set_cookie() 或者 set_signed_cookied() 方法给客户端颁发一个 cookie,然后再带着颁发的 cookie 响应用户请求。操作代码结构如下。def xxxx(request, *args, **kwargs): # ... rep = HttpResponse(...) # 或者 rep = render(request, ...) # 或者 rep = redirect( ...) # 两种设置cookie的方法,一种不加salt,另一个加salt rep.set_cookie(key, value,...) rep.set_signed_cookie(key, value, salt='加密盐', max_age=None, ...) return rep查:查询 cookie 是在发送过来的 HTTP 请求中的,因此对应的查询 Cookie 方法封装在 HttpRequest 类中,对应的操作语句如下:request.COOKIES['key']request.COOKIES.get['key']# 对应前面使用前面加密的cookierequest.get_signed_cookie(key, default=RAISE_ERROR, salt='', max_age=None)改:调用前面的 set_cookie() 或者 set_signed_cookie() 方法修改 Cookie 即可;删:直接使用 HttpReponse 类的 delete_cookie() 删除 cookie 中对应 key 值。案例1:Django 中 Cookie 实操。我们在前面的登录表单功能上改造视图函数,保证一次登录后,后续再次 GET 请求时能自动识别登录用户。此外还设置一个 Cookie 过期时间,过期之后再次 GET 请求时又回到登录页面。调整登录表单的视图类:class TestFormView2(TemplateView): template_name = 'test_form2.html' def get(self, request, *args, **kwargs): success = False form = LoginForm() print("[{}] cookies:{}".format(datetime.now().strftime('%Y-%m-%d %H:%M:%S'), request.COOKIES)) if request.get_signed_cookie('user', default='anonymous', salt=default_salt) == 'spyinx': success = True return self.render_to_response(context={'success': success, 'form': form}) def post(self, request, *args, **kwargs): form = LoginForm(request.POST) success = True err_msg = "" rep = self.render_to_response(context={'success': success, 'err_msg': err_msg, 'form': form}) if form.is_valid(): login_data = form.clean() name = login_data['name'] password = login_data['password'] if name != 'spyinx' or password != 'SPYinx123456': success = False err_msg = "用户名密码不正确" else: print('设置cookie') rep.set_signed_cookie('user', 'spyinx', salt=default_salt, max_age=10) else: success = False err_msg = form.errors['password'][0] return rep可以看到,在 get()方法中我们通过 get_signed_cookie() 方法获取 cookie 中的 user 信息,判断是否为 spyinx。若正确则返回成功登录的页面,否则返回登录页面。在 post() 方法中,对于登录成功的情况我们通过 set_signed_cookie() 方法颁发了一个 cookie 给客户端,并设置过期时间为10s,后续客户端的请求中都会自动带上这个 cookie。20
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