I want a 5 character string composed of characters picked randomly from the set [a-zA-Z0-9] . What's the best way to do this with JavaScript? 我认为这会对你有用： function makeid() { var text = ""; var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; for (var i = 0; i < 5; i++) text += possible.charAt(Math.floor(Math.random() * possible.length
我想要一个由字符串[a-zA-Z0-9]随机选取的5个字符的字符串。 用JavaScript做这件事的最好方法是什么？ 我认为这会对你有用： function makeid() { var text = ""; var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; for (var i = 0; i < 5; i++) text += possible.charAt(Math.floor(Math.random() * possible.length)); return text; } console.log(makeid());
如何在JavaScript中将string转换为integer ？ The simplest way would be to use the native Number function: var x = Number("1000") If that doesn't work for you, then there are the parseInt , unary plus , parseFloat with floor , and Math.round methods. parseInt: var x = parseInt("1000", 10); // you want to use radix 10 // so you get a decimal number even with a leading 0 and an old browse
如何在JavaScript中将string转换为integer ？ 最简单的方法是使用本机Number函数： var x = Number("1000") 如果这不适合你，那么就有parseInt ， unary plus ， parseFloat和floor ，以及Math.round方法。 parseInt函数： var x = parseInt("1000", 10); // you want to use radix 10 // so you get a decimal number even with a leading 0 and an old browser ([IE8, Firefox 20, Chrome 22 and older][1]) 一元加
What is the difference between using the delete operator on the array element as opposed to using the Array.splice method? For example: myArray = ['a', 'b', 'c', 'd']; delete myArray[1]; // or myArray.splice (1, 1); Why even have the splice method if I can delete array elements like I can with objects? delete will delete the object property, but will not reindex the array or update its le
在数组元素上使用delete操作符与使用Array.splice方法相比有什么Array.splice ？ 例如： myArray = ['a', 'b', 'c', 'd']; delete myArray[1]; // or myArray.splice (1, 1); 为什么即使有splice方法，如果我可以用对象删除数组元素？ delete将删除对象属性，但不会重新索引数组或更新其长度。 这使得它看起来好像是未定义的： > myArray = ['a', 'b', 'c', 'd'] ["a", "b", "c", "d"] > delete myArray[0] t
In answering another question I became aware that my Javascript/DOM knowledge had become a bit out of date in that I am still using escape / unescape to encode the contents of URL components whereas it appears I should now be using encodeURIComponent / decodeURIComponent instead. What I want to know is what is wrong with escape / unescape ? There are some vague suggestions that there is some s
在回答另一个问题时，我意识到我的Javascript / DOM知识已经过时了，因为我仍然使用escape / unescape来编码URL组件的内容，而现在我应该使用encodeURIComponent / decodeURIComponent 。 我想知道的是escape / unescape有什么问题？ 有一些模糊的建议，说Unicode字符存在某种问题，但我找不到任何明确的解释。 我的网站体验相当有偏见，几乎所有的网站都在编写与Internet Explorer绑定的大型Intranet应用程序。 这涉及到
Is there any JavaScript library that makes a dictionary out of the query string, ASP.NET style? Something which can be used like: var query = window.location.querystring["query"]? Is "query string" called something else outside the .NET realm? Why isn't location.search broken into a key/value collection ? EDIT : I have written my own function, but does any major JavaScript li
有没有任何JavaScript库使查询字符串， ASP.NET风格的字典？ 可以使用的东西，如： var query = window.location.querystring["query"]? “查询字符串”在.NET领域之外被称为别的东西吗？ 为什么不将location.search分解为关键/值集合？ 编辑 ：我写了我自己的功能，但是没有任何主要的JavaScript库吗？ 也许http://plugins.jquery.com/query-object/？ 这是它的分支https://github.com/sousk/jquery.parsequery#readme
Let's say I have a file called app.js. Pretty simple: var express = require('express'); var app = express.createServer(); app.set('views', __dirname + '/views'); app.set('view engine', 'ejs'); app.get('/', function(req, res){ res.render('index', {locals: { title: 'NowJS + Express Example' }}); }); app.listen(8080); What if I have a functions inside "tools.js". How would
假设我有一个名为app.js的文件。 很简单： var express = require('express'); var app = express.createServer(); app.set('views', __dirname + '/views'); app.set('view engine', 'ejs'); app.get('/', function(req, res){ res.render('index', {locals: { title: 'NowJS + Express Example' }}); }); app.listen(8080); 如果我在“tools.js”中有一个函数，该怎么办？ 我将如何导入它们以在apps.js中使用？
The function generateHashtag(str); is passed a string that must meet the following criteria: If the final result is longer than 140 chars it must return false. If the input is a empty string it must return false. It must start with a hashtag (#). All words must have their first letter capitalized. Example Input to Output: " Hello there thanks for trying my Kata" => "
函数generateHashtag(str); 传递一个必须符合以下标准的字符串： 如果最终结果超过140个字符，它必须返回false。 如果输入是一个空字符串，它必须返回false。 它必须以标签（＃）开头。 所有的单词必须首字母大写。 输入输出示例： “你好，谢谢你尝试我的Kata”=>“#HelloThereThanksForTryingMyKata” “Hello World”=>“#HelloWorld” 这是我的代码到目前为止： function generateHashtag (str) { if (!s
I was just going through the code of jBox.js and came across the following lines of code: jQuery(document).on('keyup.jBox-' + this.id, function(ev) { (ev.keyCode == 37) && this.showImage('prev'); (ev.keyCode == 39) && this.showImage('next'); }.bind(this)); Have a look at the code HERE , this guy seems to compulsively bind functions with the value of this , I have a few q
我只是浏览了jBox.js的代码，并且遇到了以下几行代码： jQuery(document).on('keyup.jBox-' + this.id, function(ev) { (ev.keyCode == 37) && this.showImage('prev'); (ev.keyCode == 39) && this.showImage('next'); }.bind(this)); 看看这里的代码，这个家伙似乎强制性地绑定了this功能的价值，我对这个模式有几个问题。 这是一种设计模式吗？ 作者试图通过将大多数方法与this绑定来实现什么
This is what I currently have: test(function(){ console.dir('testing'); }); // Input a function function test(fn){ console.dir(fn.toString().replace('dir','log')); // console: function (){console.log('testing');} // try to evaluate string back to a function eval(fn.toString().replace('dir','log')); } Can I modify something in a function (eg,'testing' to 'hello
这是我目前拥有的： test(function(){ console.dir('testing'); }); // Input a function function test(fn){ console.dir(fn.toString().replace('dir','log')); // console: function (){console.log('testing');} // try to evaluate string back to a function eval(fn.toString().replace('dir','log')); } 我可以修改某个函数中的某些东西吗（例如，'测试'到'hello world'）
JavaScript keeps surprising me and this is another instance. I just came across some code which I did not understood at first. So I debugged it and came to this finding: alert('a'['toUpperCase']()); //alerts 'A' Now this must be obvious if toUpperCase() is defined as a member of string type, but it did not make sense to me initially. Anyway, does this work because toUpperCase is a member
JavaScript让我感到惊讶，这是另一个例子。 我刚刚遇到了一些我一开始就不明白的代码。 所以我调试它并得出这个结论： alert('a'['toUpperCase']()); //alerts 'A' 现在，如果toUpperCase()被定义为字符串类型的成员，那么这一点很明显，但最初对我来说没有意义。 无论如何， 这是否是因为toUpperCase是'a'的成员？ 或者幕后有其他事情发生？ 我正在阅读的代码具有如下功能： function callMethod(method) {