throw new error

This article mainly introduces exception capture in JavaScript. This article explains how to throw an exception by throwing a throw statement and capturing an exception by trycatchfinally statement. For more information, see the same Java language,

//1. Create an Ajax object//var xhr=new xmlhttprequest;//var xhr=null;//try{//if (window. XMLHttpRequest) {//xhr=new XMLHttpRequest;//}else if (new ActiveXObject ("Microsoft.XMLHTTP")) {//xhr=new ActiveXObject ("Microsoft.XMLHTTP");//}else if (new

Why is async required? Why Look at a piece of code.Question 1: for (Var i=0;i } Alert (' Hello world!!! '); This code means to do 100 ... After the next implementation of alert, the problem is that seriously blocked the

JavaScript is nothing more than introducing the script tag to the page. But when the project grows, N JavaScript codes are introduced to a single page. merging a single file reduces the number of requests, however, the requested file volume is large.

Common DOM sorting Js has a lot of cross-browser pitfalls in DOM operations. This article takes me nearly a week to organize, and I will sort out the big and small pitfalls Based on the instances ". Preface: Html builds a DOM tree for the document,

JavaScript design pattern-Prelude (encapsulation and Information Hiding)3. encapsulation and Information Hiding: Information Hiding is used for decoupling and defining private data and methods. Encapsulation is a technology used to hide information.

Java Lock-another Implementation of Synchronization Usually Junior programmers like to use the synchronized keyword to implement synchronization mechanism. The reason is simple. It is simple to use. We don't need to consider more details and have

Copy codeThe Code is as follows:// Open the modal windowFunction dialog (obj ){If (obj. url = undefined | obj. url = null ){Throw new Error ("please set obj. url ");}Var url = obj. url;If (url. indexOf ("? ")! =-1 ){Url = url + "& r _ =" + Math.

Functions used to display flash in Sina. They can be used after formatting.Sinaflash. jsCopy codeThe Code is as follows:/*** @ Author [sina] zhangping1 @* @ Version v1.1.3* Date: 2006-9-8 2006-12-15*/If (typeof (sina )! = "Object") {var sina =

// Compare whether the array is the sameModeler. compArray = function (array1, array2){If (array1 & typeof array1 = "object" & array1.constructor = Array) & (array2 & typeof array2 = "object" & array2.constructor = Array )){If (array1.length = array2

The earliest curry function is a little polymorphism, that is, the Branch is selected internally Based on the function parameters:Copy codeThe Code is as follows:// Http://www.openlaszlo.org/pipermail/laszlo-user/2005-March/000350.html//★★On 8 Mar 20

In the previous each method, the $ break and $ continue in the source code are missing. These two variables are predefined and act as break and continue statements in a normal loop. For efficiency, in some operations, you do not need to traverse a

Sooner or later, you need to use the abstract results of other developers-that is, you rely on others' code. I like to rely on free (no dependency) modules, but that is hard to implement. Even the beautiful black box components you have created will

ConcurrentHashMap source code analysisCocurrentHashMap uses HashTable to implement concurrent hash search and storage by locking the entire table. CocurrentHashMapt can implement the same functions through Segment, but it is more efficient. In jdk1.6

JavaScript dependency Injection I like to quote this sentence, "a program is a management of complexity ". The computer world is a huge abstract building group. We simply wrap some things and then release new tools to repeat them. Now let's think

Read Catalogue Recommendation 41: make multiple inheritance a reality Recommendation 42: make a tool class non-instantiated Recommendation 43: Avoid shallow copies of objects Recommendation 44: The use of a copy of a serialized

/*** Created by Administrator on 2017/3/3 0003.*/var mongo=require (' MongoDB ');var config=require ("./config.js"). Config;var mongoclient=mongo.mongoclient;var Objectid=mongo.objectid;/* Connect to Database */function _connectdb (callback)

This article says that the class in the java.util.concurrent.atomic bag, a total of 12. There are very many articles on the Web parsing these classes. Here are some key points to talk about.These 12 classes can be divided into three groups:1. Common

Read Catalogue Recommendation 41: Make multiple inheritance a reality Recommendation 42: Make a tool class non-instantiated Recommendation 43: Avoid shallow copies of objects Recommendation 44: The use of a copy of a serialized

This article has been migrated to code quiz , you can also check this article here , please pay more attention to my new technology blog codewenda.comIn the Chinese search, did not find a better about how to use their own pre-created database in the