Issues with Date() when using JSON.stringify() and JSON.parse()

I am trying to calculate the difference between two times using JavaScript. It's just basic math but I seem to have some issues with that while using JSON.stringify() and JSON.parse() . If you're wondering why am I applying the JSON.stringify() function to the date, it's because I using local storage to store some data on the client side and use it whenever the client lands on my w

使用JSON.stringify()和JSON.parse()时,Date()

我正在尝试使用JavaScript计算两次之间的差异。 这只是基本的数学计算,但我似乎在使用JSON.stringify()和JSON.parse()时JSON.stringify()一些问题。 如果您想知道为什么我将JSON.stringify()函数应用到日期,这是因为我使用本地存储将一些数据存储在客户端,并在客户端再次登录到我的网站时使用它(这样做速度更快而不是向服务器发出更多请求)。 该数据通常会data_update更新一次(我通过另一个网站的API抓取数据),因此

Ukkonen's suffix tree algorithm in plain English

I feel a bit thick at this point. I've spent days trying to fully wrap my head around suffix tree construction, but because I don't have a mathematical background, many of the explanations elude me as they start to make excessive use of mathematical symbology. The closest to a good explanation that I've found is Fast String Searching With Suffix Trees, but he glosses over various po

Ukkonen的后缀树算法在普通英语中

这一点我感觉有点厚。 我花了好几天的时间试图完全包裹后缀树构造,但因为我没有数学背景,所以很多解释在我开始过度使用数学符号学的时候就避而远之。 最接近我找到的一个很好的解释是使用后缀树的快速字符串搜索,但是他掩盖了各个点,并且该算法的某些方面仍然不清楚。 我相信,Stack Overflow对这个算法的逐步解释对于除了我之外的许多其他人是无价的。 作为参考,这里是Ukkonen关于算法的论文:http://www.cs.helsink

Remove empty elements from an array in Javascript

How do I remove empty elements from an array in JavaScript? Is there a straightforward way, or do I need to loop through it and remove them manually? I use this method, extending the native Array prototype: Array.prototype.clean = function(deleteValue) { for (var i = 0; i < this.length; i++) { if (this[i] == deleteValue) { this.splice(i, 1); i--; } } ret

在Javascript中删除数组中的空元素

如何从JavaScript中的数组中删除空元素? 有没有一种简单的方法,还是我需要循环并手动删除它们? 我使用这种方法,扩展了本地数组的原型: Array.prototype.clean = function(deleteValue) { for (var i = 0; i < this.length; i++) { if (this[i] == deleteValue) { this.splice(i, 1); i--; } } return this; }; test = new Array("", "One", "Two", "", "Three", "", "Four").cl

How can I select an element by name with jQuery?

Have a table column I'm trying to expand and hide: jQuery seems to hide the td elements when I select it by class but not by element's name. For example, why does: $(".bold").hide(); // selecting by class works $("tcol1").hide(); // select by element name does not work Note the HTML below, the second column has the same name for all rows. How could I create this collection using th

我如何使用jQuery按名称选择元素?

有一个表列,我试图扩大和隐藏: 当我按类选择它时,jQuery似乎隐藏了td元素,而不是元素的名称。 例如,为什么会: $(".bold").hide(); // selecting by class works $("tcol1").hide(); // select by element name does not work 请注意下面的HTML,第二列对所有行都有相同的名称。 我如何使用name属性创建这个集合? <tr> <td>data1</td> <td name="tcol1" class="bold"> data2&l

How do I redirect with JavaScript?

This question already has an answer here: How do I redirect to another webpage? 67 answers 要重定向到另一个页面,您可以使用: window.location = "http://www.yoururl.com"; window.location.replace('http://sidanmor.com'); It's better than using window.location.href = 'http://sidanmor.com'; Using replace() is better because it does not keep the originating page in the session histor

如何使用JavaScript重定向?

这个问题在这里已经有了答案: 我如何重定向到另一个网页? 67个答案 要重定向到另一个页面,您可以使用: window.location = "http://www.yoururl.com"; window.location.replace('http://sidanmor.com'); 这比使用window.location.href = 'http://sidanmor.com'; 更好 window.location.href = 'http://sidanmor.com'; 使用replace()更好,因为它不会将始发页保留在会话历史记录中,这意味着用户不会陷

browserify and babelify very slow due to large data js files

I have a nodejs project which uses large dictionary lists (millions of entries), stored in js files, that look like this: module.exports = ["entry1", "entry2", "entry3", "entry4", "entry5", etc.]; and then I use them from the other files like this: var values = require('./filePath'); This works great and it works in the browser too

由于大数据js文件,浏览和babelify非常缓慢

我有一个nodejs项目,它使用大型字典列表(数百万条目),存储在js文件中,如下所示: module.exports = ["entry1", "entry2", "entry3", "entry4", "entry5", etc.]; 然后我从其他文件中使用它们: var values = require('./filePath'); 这个工程很好,它也可以在浏览器中使用(使用browserify),但捆绑需要很长时间 - 大约10分钟。 我使用以下命令来创

How to generate a rolling std line chart in dc.js/reductio/crossfilter

I want to show a line graph with rolling std over the sum of values for an interval of dates. The code for the generation of the crossfilter/reductio object is : myCrossfilter = crossfilter(data); function getRunningDates(numDays) { return function getDates(d) { var s = d.ValueDate; var e = new Date(s); e.setDate(e.getDate() + numDays); a = []; whil

如何在dc.js / reductio / crossfilter中生成滚动的std折线图

我想在日期间隔内显示一个包含滚动标准值的线图。 生成crossfilter / reductio对象的代码是: myCrossfilter = crossfilter(data); function getRunningDates(numDays) { return function getDates(d) { var s = d.ValueDate; var e = new Date(s); e.setDate(e.getDate() + numDays); a = []; while (s < e) { a.push(s); s = new Date(s.setDate(

Get soundManager soundId from class using jQuery

I am using bar-ui js of soundmanager. <div id="sm2-99943" class="sm2-bar-ui content compact flat full-width playlist full-width-player "> <div class="bd sm2-main-controls"> <div class="sm2-inline-element sm2-button-element"> <div class="sm2-button-bd" style="background: transparent url(http://support.simplepodcaster.com/wp-content/uploads/2018/04/podc

使用jQuery从类获取soundManager soundId

我正在使用soundmanager的bar-ui js。 <div id="sm2-99943" class="sm2-bar-ui content compact flat full-width playlist full-width-player "> <div class="bd sm2-main-controls"> <div class="sm2-inline-element sm2-button-element"> <div class="sm2-button-bd" style="background: transparent url(http://support.simplepodcaster.com/wp-content/uploads/2018/04/podcas

Need to merge values in array

I have a set of data that looks similar to this: [ "L1-1_L1.0-1_L1.0.0-1", "L1-1_L1.0-2_L1.0.0-1", "L1-1_L1.0-2_L1.0.0-2", "L1-2_L1.0-1_L1.0.0-1", "L1-2_L1.0-1_L1.0.0-2", "L1-3_L1.0-1_L1.0.0-3" ]; I need to find a way to get a referenceable layered count of each of these strings. eg How many L1-1 selections? 3 Of the L1-1, how many were L1.0-2 selections? 2 Of

需要合并数组中的值

我有一组类似于这样的数据: [ "L1-1_L1.0-1_L1.0.0-1", "L1-1_L1.0-2_L1.0.0-1", "L1-1_L1.0-2_L1.0.0-2", "L1-2_L1.0-1_L1.0.0-1", "L1-2_L1.0-1_L1.0.0-2", "L1-3_L1.0-1_L1.0.0-3" ]; 我需要找到一种方法来获得每个这些字符串的可引用分层计数。 例如 多少个L1-1选择? 3 在L1-1中,L1.0-2选择了多少? 2 在L1-1 => L1.0-2中,L1.0.0-1选择了多少? 1 在L1-1 => L1.0-2中,L1.

Safely turning a JSON string into an object

Given a string of JSON data, how can you safely turn that string into a JavaScript object? Obviously you can do this unsafely with something like... var obj = eval("(" + json + ')'); ...but that leaves us vulnerable to the json string containing other code, which it seems very dangerous to simply eval. JSON.parse(jsonString)是一种纯粹的JavaScript方法,只要你能保证一个合理的现代浏览器。 The

安全地将JSON字符串转换为对象

给定一串JSON数据,你怎样才能安全地将该字符串转换为JavaScript对象? 显然你可以用这样的东西不安全地做... var obj = eval("(" + json + ')'); ......但是这让我们容易受到包含其他代码的json字符串的影响,这对于简单的eval来说似乎非常危险。 JSON.parse(jsonString)是一种纯粹的JavaScript方法,只要你能保证一个合理的现代浏览器。 jQuery方法现在已被弃用。 改用此方法: let jsonObject = JSON.parse(jsonStrin