Express error handling and async await

In my Node.js app I added the following code to catch every uncaught exception: process.on('uncaughtException', function (err: Error) { try { logger.err(err); } catch (err) { } }); The problem is that Express has its own default error handler, which catches every uncaught exception. Now, Express caught the exceptions before Node (process.on), so my logger didn't get re

快速错误处理和异步等待

在我的Node.js应用程序中,我添加了下面的代码来捕获每个未捕获的异常: process.on('uncaughtException', function (err: Error) { try { logger.err(err); } catch (err) { } }); 问题在于Express有它自己的默认错误处理程序,它捕获每个未捕获的异常。 现在,Express在Node(process.on)之前捕获了异常,所以我的记录器没有达到。 但是,可以添加另一个错误处理程序,它可以在执行Express之前捕获

Do I need to escape any characters for a json object?

In my code I am takign a class and converting it to JSON. All my test is in double quotes, eg: { "a" : "hello world ! '' this is john's desk" } Do I need to escape any characters when wrapped in double quotes? Is it just double quotes inside of the string I need to escape? Yes, you can escape the quotes with " . Also, you can use JSON.stringify() : https://developer.mozilla.org/en-U

我是否需要为json对象转义任何字符?

在我的代码中,我收录了一个类并将其转换为JSON。 我所有的测试都用双引号,例如: { "a" : "hello world ! '' this is john's desk" } 用双引号包裹时,我需要转义任何字符吗? 它只是在我需要逃避的字符串中的双引号? 是的,你可以用"来避开引号。 另外,您可以使用JSON.stringify() :https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

Is '""' a valid JSON string?

I am confused. To quote json.org JSON is built on two structures: A collection of name/value pairs. In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array. An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence. So, I don't think '""' should be a v

''“'是一个有效的JSON字符串吗?

我很困惑。 引用json.org JSON建立在两个结构上: 名称/值对的集合。 在各种语言中,这被实现为对象,记录,结构,字典,散列表,键控列表或关联数组。 有序的值列表。 在大多数语言中,这是作为数组,矢量,列表或序列实现的。 所以,我不认为''''应该是一个有效的JSON字符串,因为它既不是一个列表值(即不以'['开始并以']'结尾),但JSON.parse不会给出异常并返回空字符串。 它

How do you safely wrap a JS string variable in double quote chars?

Obviously when you're creating an actual string literal yourself, you backslash escape the double quote characters yourself. var foo = "baz"bat"; Just as you would with the handful of other control characters, like linebreaks and backslashes. var bar = "baz\batnmynew line and a "quote" "; but if you're just wrapping that existing variable in quote character, ie to give it to some othe

你如何在双引号字符中安全地包装JS字符串变量?

很明显,当你自己创建一个实际的字符串文字时,你可以自己使用双引号字符来反斜杠。 var foo = "baz"bat"; 就像你对其他一些控制角色,比如换行符和反斜杠一样。 var bar = "baz\batnmynew line and a "quote" "; 但是如果你只是用引用字符来包装那个现有的变量,也就是把它提供给需要引用输入的其他系统,那么就会有一些混淆。 显然你必须避免字符串中任何可能的双引号字符。 var doubleQuoteRe = /"/g; var quoted = """

in JSON, Why is each name quoted?

The JSON spec says that JSON is an object or an array. In the case of an object, An object structure is represented as a pair of curly brackets surrounding zero or more name/value pairs (or members). A name is a string. ... And later, the spec says that a string is surrounded in quotes. Why? Thus, {"Property1":"Value1","Property2":18} and not {Property1:"Value1",Property2:18} Quest

在JSON中,为什么每个名称都被引用?

JSON规范说JSON是一个对象或一个数组。 在物体的情况下, 对象结构被表示为围绕零个或多个名称/值对(或成员)的一对大括号。 名称是一个字符串。 ... 后来,规范说明了一个字符串被引号括起来。 为什么? 从而, {"Property1":"Value1","Property2":18} 并不是 {Property1:"Value1",Property2:18} 问题1 :为什么不让名称/值对中的名称成为不带引号的标识符? 问题2 :在Javascript中评估时,上述两种表示之间

javascript

The following is the Android log output when the React Native app is started for a while before disconnecting it from the Meteor (DDP) server by killing the Meteor server. Using console.log("<App /> render") to indicate when the render function of App component is called, it appears that whenever the render function is called again after createContainer passes it some new props

JavaScript的

以下是在React Native应用程序启动一段时间之前的Android日志输出,然后通过关闭Meteor服务器将其从Meteor(DDP)服务器断开连接。 使用console.log("<App /> render")来指示何时调用App组件的render函数,看起来无论何时在createContainer传递一些新的props之后再次调用render函数时, Key is already defined错误是触发。 什么导致这个错误/警告,我们如何解决它? 该应用程序仍然运行良好,但在这里肯定

Return promise inside resolve function as its continuation

Context I'm working with Angular. I have a service called UserService, that handles login, authentication and user data requests. The get method needs to check if the user has a valid (not expired) token for authentication before making the get request. So, if it has, make the request, if not, request a token and then make the request. Problem This get method needs to hide its compl

内部解析函数返回诺言作为其延续

上下文 我正在和Angular合作。 我有一个名为UserService的服务,用于处理登录,身份验证和用户数据请求。 在get请求之前, get方法需要检查用户是否有用于认证的有效(未过期)令牌。 所以,如果有的话,做出请求,如果没有请求一个令牌, 然后发出请求。 问题 这个get方法需要隐藏它的复杂请求。 它只能返回一个Promise,因为它只提出一个请求。 所以,一个使用的例子: UserService .get() .then(data =&

Make a Line between two elements using CSS and JavaScript

I am attempting to have a line go between the two dots on my page. The images are draggable and placeable into the DIVs so their position can change yet the line still needs to connect them. So far I have tried this with only a custom line to start there. var s = document.getElementById("Red1X"); var x = 200, y = 200; s.style.x2 = x + "px"; s.style.y2 = y + "px"; function allowDrop(ev)

使用CSS和JavaScript在两个元素之间划一条线

我试图在我的页面上的两个点之间划一条线。 这些图像可拖动并可放置到DIV中,因此它们的位置可以更改,但仍需要连接它们。 到目前为止,我只用一条自定义的线来尝试这一点。 var s = document.getElementById("Red1X"); var x = 200, y = 200; s.style.x2 = x + "px"; s.style.y2 = y + "px"; function allowDrop(ev) { ev.preventDefault(); } function drag(ev) { ev.dataTransfer.setData("text", ev.ta

Get first element in array with index not starting from 0

I'm using a javascript library which returns arrays not starting from zero like starting from 26 or 1500, what i want to do is a method to get the first element in that array regardless of the index number starting with 0 or any other number. Are they any method to do this in javascript ? The information below is generally useful, but for the problem the OP listed, Nina's answer is by

获取索引不是从0开始的数组中的第一个元素

我正在使用一个JavaScript库,它返回的数组不是从零开始,比如从26或1500开始,我想要做的是获取该数组中第一个元素的方法,而不管以0或任何其他数字开头的索引号。 他们是否有任何方法在JavaScript中做到这一点? 以下信息通常很有用,但对于OP列出的问题,Nina的答案是更好的解决方案。 这些被称为稀疏数组,它们是您可能想要for-in数组上使用for-in的少数情况之一。 请记住,数组是JavaScript中的对象,并且数组条目

remove null values from arrays with splice

I'm trying to make a function to remove null values from multidimensional arrays, but it doesn't work very well. It does not penetrate to the last layer of arrays, and does not remove when two null values are adjacent. function isArray(obj) { // http://stackoverflow.com/a/1058753/1252748 return Object.prototype.toString.call(obj) === '[object Array]'; } function removeEmptyArra

使用拼接从数组中删除空值

我试图做一个函数来从多维数组中删除空值,但它不工作得很好。 它不会穿透到最后一层数组,并且当两个空值相邻时不会移除。 function isArray(obj) { // http://stackoverflow.com/a/1058753/1252748 return Object.prototype.toString.call(obj) === '[object Array]'; } function removeEmptyArrayElements(obj) { for (key in obj) { if (obj[key] === null) { obj = obj.splice(key, 1)