rhino implements

Promise implements lazyman., promise implements lazyman First, please refer to the implementation of setTimeout by netizens: Function _ LazyMan (name) {this. tasks = []; var self = this; var fn = (function (n) {var name = n; return function () {console. log ("Hi! This is "+ name + "! "); Self. next () ;}}) (name); this. tasks. push (fn); setTimeout (function () {self. next () ;}, 0); // start the task in th

In Linux, mysql implements remote connection and linuxmysql implements First, it is clear that mysql does not prohibit remote connection, but the MYSQL account does not allow remote connection. I may think that I am a bit/s, but I think it is very important to distinguish this. By default, remote connection is disabled for all accounts. When installing MYSQL, there is a CHECKBOX in setting the ROOT password

MySQL implements remote login, and mysql implements remote login. Cause analysis:Host 'local' is not allowed to connect to this MySQL server typical remote permission issues.Problem: MySQL does not have the permission to enable remote logon. It depends on the system used by your server, such as linux or Windows. This solution is different. You can search for it online and there are a lot of materials to sol

Mysql implements cascade operations (cascade update and cascade deletion) and mysql implements 1. Create two tables stu, SC Create table stu (sid int UNSIGNED primary key auto_increment, name varchar (20) not null) TYPE = InnoDB charset = utf8; create table SC (scid int UNSIGNED primary key auto_increment, sid int UNSIGNED not null, score varchar (20) default '0', index (sid), -- the foreign key must be ind

Explain how MySQL implements master-slave replication, and explain how mysql implements master-slave replication. 1. What is master-slave replication? The DDL and DML operations in the primary database are transmitted to the slave database through binary logs, and these logs are re-executed (redone ); so that the data in the slave database is consistent with that in the master database. Ii. Role of master-s

Js implements flying star special effect code, js implements star special effect code The example in this article describes the code for js to implement the special effects of flying stars, which will be shared with you for your reference. The specific implementation code is as follows: Copy codeThe Code is as follows: I hope this article will help you design javascript programs. How can I change the image

Java implements converting image to base64 string java implements converting base64 string to image, javabase64 Java image to base64 string, base64 string to image, the specific content is as follows 1. Convert the image to a base64 string: /*** Convert a base64 encoded String to an image * @ param imgStr base64 encoded String * @ param path image path * @ return */public static boolean base64StrToImage (St

Java implements full string arrangement and java implements string The string is arranged in full order. The details are as follows: Enter a string and print all characters in the string in lexicographically. For example, if abc is input, all the strings abc, acb, bac, bca, cab, and CBA that can be arranged by characters a, B, and c are printed. Results are output alphabetically. Recursive thinking: The str

On how ArrayList implements thread security, and how arraylist implements threads I. Use the synchronized keyword 2. Use Collections. synchronizedList (); Assume that the code you created is as follows: List To solve this thread security problem, you can use Collections. synchronizedList (), for example: List The methods used are almost the same as those of ArrayList. For details, refer to the api d

C ++ 11 implements a simple lexical_cast, and 11 implements lexical_cast. There is a lexical_cast in boost that can be used for conversion between basic types in a unified manner, such as conversion between strings to numbers, numbers to strings, bool, and strings and numbers. Boost: lexical_cast is easy to use:# Include The lexical_cast method is missing in c ++ 11, but c ++ 11 provides some basic type con

Javascript implements the list scrolling method, and javascript implements scrolling. This example describes how to implement list scrolling in javascript. Share it with you for your reference. The details are as follows: Index.html is as follows: Scroll_img.js is as follows: Function scroll_img (target, distance, show_width, li_width, mr) {this. distance = distance; // the distance between each movement a

Php implements the sign-in function, and php implements sign-in. First, I created two tables in the database. One is the user's integral table, and the other is the sign-in status table, which is used to record the number of user points and the first-come status. In the user sign-in status table, we have a field, last_sign_time, that is, the last sign-in time. Each time we sign in, we can compare this tim

YII implements paging, and YII implements paging. This article describes how to implement paging in yii by using the instance code for your reference. The specific code is as follows: 1. Some controller code: public function actionTest() { $criteria=new CDbCriteria; $criteria->order='id DESC'; $count=User::model()->count($criteria); $pager=new CPagination($count); $pager->pageSize=10; $pager->applyLimit($cr

Servlet implements paging technology, and servlet implements Paging Key code: 1 // ===================================== paging functions ======== ===================================== 2 int pageSize = 3; 3 int pageNow = 1; 4 int rowCount = 0; 5 int pageCount = 0; 6 String sPageNow = request. getParameter ("pageNow"); 7 if (sPageNow! = Null) {8 pageNow = Integer. parseInt (sPageNow); 9} 10 Connection con =

Python3 implements the concurrent check proxy pool address method, and python3 implements the concurrent check The example in this article describes how to implement concurrent check proxy pool address in Python3. We will share this with you for your reference. The details are as follows: # Encoding = UTF-8 # author: walker # date: 2016-04-14 # summary: Use coroutine/thread pool concurrency to check agent v

Zabbix implements the alarm function and zabbix implements the alarm function. 1. Apply for an enterprise account, Application address https://qy.weixin.qq.com/ 2. log on to the enterprise account Figure 1 Figure 2 2. Add an account Figure 1 Figure 2 After completing the preceding steps, the account is added. 3. Create an application Figure 1 Figure 2 Figure 3 Figure 4 After the above four images a

Php implements the online download program installation package function, and php implements the program installation package You can easily download various program installation packages (Discuz! , Phpwind, Dedecms, WordPress... and other common programs) and stored on the server, greatly reducing the installation package time for the webmaster to upload the program. The default password is

PHP implements resumable download, and php implements resumable download. This example describes how to implement resumable download in PHP. Share it with you for your reference. The specific implementation code is as follows:Copy codeThe Code is as follows: /** PHP downloads resumable upload*/Function dl_file_resume ($ file ){// Check whether the file existsIf (! Is_file ($ file) {die ("$ Len = filesize ($

Python implements paging, and python implements Paging The examples in this article share with you the code for displaying the page Effect of python for your reference. The specific content is as follows: Difficulty: Clear Layout #! /Usr/bin/python #-*-coding: UTF-8-*-from PyQt4.QtCore import * from PyQt4.QtGui import * class PageWidget (QWidget): def _ init _ (self, parent = None): super (PageWidget, self

Pyton implements SQLHelper and pyton implements sqlhelper After reading Liao's tutorial, I realized this module and implemented it according to my own ideas. The code is included. 1 import MySQLdb, logging, threading, time, uuid 2 logging. basicConfig (level = logging. INFO, format = '% (asctime) s % (filename) s [line: % (lineno) d] % (levelname) s % (message) s ', datefmt = '% a, % d % B % Y % H: % M: % s