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怎么修改select下拉option的样式不想自己用div模拟再写一遍了有办法吗

需求如下：哪位同僚会改教教我呗@~~@...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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zepto某些模块和swiper冲突

在浏览器手机模式下只要跟触发点击都会报下面这个错误，是什么原因 Uncaught TypeError: Cannot read property 'trigger' of undefined？...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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node垃圾回收、内存泄漏相关问题

最近刚开始研究垃圾回收，在试着回答饿了么大前端里的node内存释放相关的问题时，遇到了一些疑问： let arr = []; while(true) arr.push(1); 无限增加的数组，这肯定是会爆掉内存的 let arr = []; ... 个闭包不会被回收掉，所以会在内存中一直累积? 因为自己不是很确定，所以麻烦懂的小伙伴回答一下，谢谢！...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pandas - Remove rows from a couple of dataframes with equal values

I have two data frames that I obtained from a couple of csv files. For example: df1 data1 data2 data3 0 cow cat 53 1 ... am not getting the results that I need, what am I missing?...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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205 views

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js构造对象问题

function Person {} Person.prototype.test = function() { } new Person() new Person 这两种写法有相同的效果，不加括号为什么和前一个效果一样...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Create covariance matrix using ratio and rotation degree

I am a beginner in Linear Algerbra. I want to create a covariance matrix using given ratio and degree of rotation For example: ... np.cov([email protected]) I could not get the desired result....

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript函数组合的时候参数相同怎样处理?

我现在需要对一个http超时进行重试,因为用的是rxjs,所以在重试之前会对取消之前的订阅,如果再次发送同样的请求也会取消之前的订阅我一共写了三个方法, beforeRetryRequest(taskId), retryRequest(http, ... 看了一些curry的知识,不知道对这个有没有帮助本人才疏学浅,还望各位不吝赐教谢谢啦~~...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Set style of -webkit using pure JavaScript using element.style.(?) = "stuff"

is it possible to style a -webkit css property with .style? or setAtrrtibute() is the way to go?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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383 views

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multithreading - SwtichToContext does not return to original thread

I'm working with an API that can only access its objects on the main thread, so I need to create a new ... freezes up at the Async.SwitchToContext lines instead of exiting out....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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519 views

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swift - SwiftUI offset Text() by font size

How can I offset a Text such that exactly splits in the middle of the character. The problem that I face is that the ... However, the size must be variable. How can this be done?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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818 views

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js 循环对象key 放入数组顺序被改变？

pastFineData是一个顺序对象，循环根据key添加对应数据，然后组成新的数组，可是看下面的图片对象的key 顺序已经和pastFineData对象排列的顺序变了，怎样能让key顺序不变啊 pastFineData: { ... 值null data[key] = cellArr[i][j] ? cellArr[i][j] : 'null'; } }...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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426 views

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angular - How to create a chart with chart.js by using data from external api

I have got some data from externel API using http get request. The code is this, export class ProfileComponent implements ... of line chart. I am a beginner in web development....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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iview table，selection事件相同，我需要根据点击不同的selection按钮计算这条数据的金额？

下面这三个是代码：题目描述由于有几个table是根据tablelist的数量循环出来的，所以他们的on-select事件都一样，点击单条，取消单条，全选的时候我都可以把选中的数据拿到生成一个新数组，并且计算它们的金额，但是全选取消的时候 ... 就没有数据出来，是个空数组，我就不知道该怎么把我当前点击全选取消的table金额清空，在最后保存的数组中删除 ...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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195 views

1 answer

Why is R adding an extra row when converting characters to dates

I am converting a vector of character data types to date data types in R using strptime. When I used sapply to check the data ... [1][2] [1] NA Thanks in advance for any help....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer

pine script - cannot call plotchar with arguments

I can't figure out how to print the letters F or T based on the bool value of the openable variable. I have tried ... , color=lineColor) plotchar(true, char=openable ? 't':'f')...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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291 views

1 answer

Route multiple components with the same base url in Angular

I am pretty new to Angular and I am creating an app that has nested information in pages (like in a file explorer) the ... it if you could explain it to me. Thank you in advance!...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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472 views

1 answer

js有变量提升，怎样才能使用当前定义的变量？

在普通的H5里面写以下js代码是可以获取到commonStatus状态的，但是我在Vue里面，单独写了一个公共方法js文件，在这个公共文件也是写的以下代码，获取到的commonStatus ... 值比如commonObj.curobj2 = true; 在commonObj的某个方法里面调用commonObj.curobj2获取到的也是undefined ...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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181 views

1 answer

Storing and retrieving data for custom Shopify apps

So I am trying to build something for my store but a few things are somewhat unclear. If I need to save some user ... I guess I want to see it somewhere in the order details....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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visual studio code - Automatically start/stop webserver in vscode debug

When debugging a web project, it needs to be built, served by a webserver, and opened in a browser, with a ... seems quite convoluted and dirty. Is there really no better way?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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微信小程序第一次进入提示添加到我的小程序

...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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364 views

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pandas.to_datetime得到的时间写入DolphinDB数据表后时间显示不正确

我用pandas.to_datetime转格式，写入流数据后时间显示不对，如下面2图所示代码如下： times = pd.to_datetime(now_time) print(times,type(times)) dat[' ... time.sleep(0.5) s1.run("tableInsert{now_stream}",da) 应该怎么转换？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ng-zorro开发angular 9，如何去除浏览器默认内边距？

我在stackoverflow上查的，都是在style.css或者index.html里加 html, body { margin: 0; padding: 0; border: 0; } 但是，ng serve打开来，还是有内边距，不管是 ... /div> <ul nz-menu> ... </ul> </nz-header> </nz-layout>...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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324 views

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收到请求，为什么 'user-agent' 信息不全，只有Mozilla/4.0

nodejs request 得到的请求数据 console.log(Object.keys(req.headers)); console.log(Object.values(req.headers)); 打出来如下 `[ 'host', 'content- ... /20100101 Firefox/74.0 是带有操作系统信息的，为什么我拿不到？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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161 views

1 answer

js如何限制函数触发间隔

现小程序连接蓝牙获取数据，蓝牙数据每秒回调20次，在回调函数中写对应的数据变动，如何设置指定时间内修改一次数据，而不是现在的每秒修改20次。...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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739 views

1 answer

coq - Why do Calculus of Construction based languages use Setoids so much?

One finds that Setoids are widely used in languages such as Agda, Coq, ... Indeed languages such as Lean have argued ... HoTT (such as cubical Agda) reduce the need for Setoids?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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189 views

1 answer

c# - Get push notifications quicker after device reboot

I'm using firebase for push notifications on both my android and iOS app with everything working fine. If I reboot the ... I doubt this would speed up the process of getting them?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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171 views

1 answer

java进阶都有哪些方法

学习java都有哪些好的方法...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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266 views

1 answer

javascript关于树的题目

以下代码结果运行结果是什么？为什么？ let cache, result = Infinity; function fun(tree) { if (!tree) return; fun(tree.left); if (cache) ... : null, right: null } } } }; fun(tree); console.log(result);...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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