As JavaScript frameworks like jQuery make client side web applications richer and more functional, I've started to notice one problem... How in the world do you keep this organized? Put all your handlers in one spot and write functions for all the events? Create function/classes to wrap all your functionality? Write like crazy and just hope it works out for the best? Give up and get
随着jQuery等JavaScript框架使客户端Web应用程序更加丰富和功能更强大，我开始注意到一个问题...... 你如何保持这种有组织的？ 把所有的处理程序放在一个地方，并为所有事件编写函数？ 创建函数/类来包装所有的功能？ 写得像疯了一样，只是希望它能够最好地工作？ 放弃并获得新的职业？ 我提到了jQuery，但它通常是任何JavaScript代码。 我发现随着线条开始堆积起来，管理脚本文件或找到您要查找的内容变得更加困难
I'm using DevExpress' DevExtreme with Angular2. I have a data grid (below) that lists states and asks the user to select some states. It is possible that some states have already been stored in the database. How do I set the previously selected states? I can see in the documentation that I should use dataGrid.instance.selectRows(arrayOfPreviouslySelectedStates) but dataGrid is instant
我正在使用DevExpress的DevExtreme和Angular2。 我有一个数据网格（下面）列出状态并要求用户选择一些状态。 一些州可能已经存储在数据库中。 我如何设置之前选择的状态？ 我可以在文档中看到我应该使用dataGrid.instance.selectRows(arrayOfPreviouslySelectedStates)但是在尝试将它设置在ngOnInit()后，dataGrid会在某个时间被实例化。 我的HTML网格： <dx-data-grid #statesGrid id="statesContainer" [dataSource]=
Hi I'm working for the first time with the charts of the DevExtreme Framework, because I'm searching for a good chart plugin for my web-application, which can solve some of my special requirements. At the moment my chart looks like this (I can't put it in a fiddle or in the stackoverflow snippet, because there I got an error, when a put an external library for globalize/chartjs.js so
您好，我第一次使用DevExtreme Framework的图表工作，因为我正在为我的web应用程序寻找一个好的图表插件，它可以解决我的一些特殊需求。 目前我的图表看起来像这样（我不能把它放在小提琴或者stackoverflow片段中，因为我得到一个错误，当把一个外部库放到globalize / chartjs.js中时，我就复制到了这个问题中） ： HTML： <!DOCTYPE html> <html> <head> <meta charset="utf-8" />
To navigate to a specific URL when the itemClick event fires, assign that URL or the anchor part (#) of that URL directly to this option as a string. How to do? How do I get assign a function to perform a custom action when a widget item is clicked? Can you get some example to do that? //Define directives to the Angular Route and DevExtreme var myApp = angular.module('myApp', ['ngRoute', 'dx'
要在itemClick事件触发时导航到特定的URL，请将该URL或该URL的锚点部分（＃）直接作为字符串分配给此选项。 怎么做？ 如何在点击一个小工具项目时分配一个函数来执行自定义操作？ 你能举个例子吗？ //Define directives to the Angular Route and DevExtreme var myApp = angular.module('myApp', ['ngRoute', 'dx']); //URL to show ? //var serviceHome = "http://localhost:8000/home"; //myApp.controller('appCtrl
I commonly see developers use an expression like the following in JavaScript: arr = [] arr[arr.length] = "Something" arr[arr.length] = "Another thing" Wouldn't push be more appropriate? arr = [] arr.push("Something") arr.push("Another thing") I actually asked myself the same question at the start of this year. UPDATED with new test cases http://jsperf.com/array-push-vs-unshift-vs-direct-
我经常看到开发人员在JavaScript中使用类似以下的表达式： arr = [] arr[arr.length] = "Something" arr[arr.length] = "Another thing" 不会push得更合适吗？ arr = [] arr.push("Something") arr.push("Another thing") 我在今年初问了自己同样的问题。 新的测试用例更新http://jsperf.com/array-push-vs-unshift-vs-direct-assignment/2 看起来铬的push速度要快得多，FF的push速度也相当快。 在IE9中，直接速度也更快
Does javascript use immutable or mutable strings? Do I need a "string builder"? They are immutable. You cannot change a character within a string with something like var myString = "abbdef"; myString[2] = 'c' var myString = "abbdef"; myString[2] = 'c' . The string manipulation methods such as trim , slice return new strings. However, I've
JavaScript使用不可变或可变字符串吗？ 我需要一个“字符串生成器”吗？ 它们是不可改变的。 你不能用类似var myString = "abbdef"; myString[2] = 'c'改变字符串中的字符var myString = "abbdef"; myString[2] = 'c' var myString = "abbdef"; myString[2] = 'c' 。 诸如trim ， slice类的字符串操作方法返回新的字符串。 然而，我总是听到Ash在他的回答中提到过
This question already has an answer here: Javascript object members that are prototyped as arrays become shared by all class instances 3 answers Constructor function introduction You can use a function as a constructor to create objects, if the constructor function is named Person then the object(s) created with that constructor are instances of Person. var Person = function(name){ this.
这个问题在这里已经有了答案： 作为数组原型的Javascript对象成员将被所有类实例共享3个答案 构造函数的介绍 如果构造函数名为Person，那么可以使用函数作为构造函数来创建对象，然后使用该构造函数创建的对象就是Person的实例。 var Person = function(name){ this.name = name; }; Person.prototype.walk=function(){ this.step().step().step(); }; var bob = new Person("Bob"); Person是构造函数。 当您使用Pe
I'm creating two objects (Inherits), both inherit from Base. The second object's property assignment overrides the value in the first object. Any thoughts? How to make a proper inheritance so that Base class will contain common members for its inheritance descendants, but the descendants could assign values of their own without interfering each other. var testParams1 = { title: "john
我创建了两个对象（Inherits），都从Base继承。 第二个对象的属性分配将覆盖第一个对象中的值。 有什么想法吗？ 如何进行适当的继承，以便Base类将包含其继承后代的通用成员，但后代可以分配自己的值而不会相互干扰。 var testParams1 = { title: "john" }; var testParams2 = { title: "mike" }; Function.prototype.inheritsFrom = function (baseClass) { this.prototype = new baseClass; this.prototype.const
I've been told namespaces shouldn't be used, as they 'pollute' the global scope. I wonder what are the alternatives? When I want to define utility functions and / or constants eg for a website, a simple way to go would be to define them by namespaces, that way the damage to the global scope is restricted to one object only. If namespaces are bad practice, a couple of question
我被告知命名空间不应该被使用，因为它们“污染”了全球范围。 我想知道什么是替代品？ 当我想为例如网站定义实用函数和/或常量时，一个简单的方法是按名称空间定义它们，这样全局范围的损害仅限于一个对象。 如果命名空间是不好的练习，就会想到几个问题： 为什么这是不好的做法？ 这个声明的范围是什么（Web应用程序/动态网站/静态网站等）？ 有什么选择？ 这个问题是从一篇关于使用extend.js的好处开始讨论的结果
有没有比这更好的方式在javascript中将数组拼接到另一个数组中var string = 'theArray.splice('+start+', '+number+',"'+newItemsArray.join('","')+'");'; eval(string); You can use apply to avoid eval: var args = [start, number].concat(newItemsArray); Array.prototype.splice.apply(theArray, args); The apply function is used to call another function, with a given context and arguments, provided as an arra
有没有比这更好的方式在javascript中将数组拼接到另一个数组中var string = 'theArray.splice('+start+', '+number+',"'+newItemsArray.join('","')+'");'; eval(string); 您可以使用apply来避免评估： var args = [start, number].concat(newItemsArray); Array.prototype.splice.apply(theArray, args); apply函数用于调用具有给定上下文和参数的另一个函数，以数组形式提供，例如： 如果我们打电话： var nums = [1,2,3,4