There is a chart instance already initialized on the dom！警告

使用Echarts插件的时候,多次加载会出现There is a chart instance already initialized on the dom.这个错误,改插件已经加载完成. 并且如果你图表中定义了点击方法,多次覆盖之后,点击方法会触发多次解决方法: 在方法最外层定义全局变量 var myCharts; 然后在插件使用方法中: if (myChart != null && myChart != "" && myChart != undef…

多次执行echarts时出现 there is a chart instance already initialized on the dom

原因,多次使用 echarts.init(document.getElementById(this.options.zid)); 解决方案设为全局…

echarts 知识点

echarts map 禁止放大缩小,设置 calculable 为 false 即可. calculable: false echarts 报错: There is a chart instance already initialized on the dom. 解决:http://blog.csdn.net/qq_37581708/article/details/78342634 echarts的chart(图表)种类: 名称类型 line 折线图 bar 柱状图 pie 饼图 echar…

通过百度echarts实现数据图表展示功能

现在我们在工作中,在开发中都会或多或少的用到图表统计数据显示给用户.通过图表可以很直观的,直接的将数据呈现出来.这里我就介绍说一下利用百度开源的echarts图表技术实现的具体功能. 1.对于不太理解echarts是个怎样技术的开发者来说,可以到echarts官网进行学习了解,官网有详细的API文档和实例供大家参考学习. 2.以下是我在工作中实现整理出来的实例源码: 公用的支持js文件 echarts.js.echarts.min.js,还有其他的图表需要支持的js文件也可以到官网下载 echa…

三种Singleton的实现方式

来源:http://melin.iteye.com/blog/838258 三种Singleton的实现方式,一种是用大家熟悉的DCL,另外两种使用cas特性来实现. public class LazySingleton { private static volatile LazySingleton instance; public static LazySingleton getInstantce() { if (instance == null) { synchronized (LazySi…

Multiton & Singleton

From J2EE Bloger http://j2eeblogger.blogspot.com/2007/10/singleton-vs-multiton-synchronization.html 1. Classic Java singleton synchronization problem public class Singleton { private static Singleton instance; /** Prevents instantiating by other clas…

Runtime运行时的那点事儿

注:本文是对 Colin Wheeler 的 Understanding the Objective-C Runtime 的翻译. 初学 Objective-C(以下简称ObjC) 的人很容易忽略一个 ObjC 特性 —— ObjC Runtime.这是因为这门语言很容易上手,几个小时就能学会怎么使用,所以程序员们往往会把时间都花在了解 Cocoa 框架以及调整自己的程序的表现上.然而 Runtime 应该是每一个 ObjC 都应该要了解的东西,至少要理解编译器会把 [target doMeth…

5.Primitive, Reference, and Value Types

1.Programming Language Primitive Types primitive types:Any data types the compiler directly supports. Primitive types map directly to types existing in the Framework Class Library (FCL). use the FCL type names and completely avoid the primitive type…

OC基础(12)

new方法实现原理类的本质类的启动过程 *:first-child { margin-top: 0 !important; } body > *:last-child { margin-bottom: 0 !important; } a { color: #4183C4; } a.absent { color: #cc0000; } a.anchor { display: block; padding-left: 30px; margin-left: -30px; cursor: point…

Why String is immutable in Java ?--reference

String is an immutable class in Java. An immutable class is simply a class whose instances cannot be modified. All information in an instance is initialized when the instance is created and the information can not be modified. There are many advantag…

Resist the Temptation of the Singleton Pattern

Resist the Temptation of the Singleton Pattern Sam Saariste THE SiNGLETON PATTERN SOLVES MANY OF YOUR PROBLEMS. You know that you only need a single instance. You have a guarantee that this instance is initialized before it's used. It keeps your desi…

[转]Hacking the iOS Spotlight

原文:http://theiostream.tumblr.com/post/36905860826/hacking-the-ios-spotlight 原文:http://theiostream.tumblr.com/post/54299348185/searchloader 原文:http://theiostream.tumblr.com/post/54339870761/hacking-the-ios-spotlight-v2 [Update] A lot of new findings h…

理解 Objective-C Runtime

初学 Objective-C(以下简称ObjC) 的人很容易忽略一个 ObjC 特性 —— ObjC Runtime.这是因为这门语言很容易上手,几个小时就能学会怎么使用,所以程序员们往往会把时间都花在了解 Cocoa 框架以及调整自己的程序的表现上.然而 Runtime 应该是每一个 ObjC 都应该要了解的东西,至少要理解编译器会把 [target doMethodWith:var1]; 编译成: objc_msgSend(target,@selector(doMethodWith:),va…

Understanding the Objective-C Runtime

Wednesday, January 20, 2010 Understanding the Objective-C Runtime The Objective-C Runtime is one of the overlooked features of Objective-C initially when people are generally introduced to Cocoa/Objective-C. The reason for this is that while Objectiv…

select2 AJAX获取数据

页面效果: index.html <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>select2</title> <!-- Tell the browser to be respo…

CodeMirror 小册子

User manual and reference guide version 5.41.1 用户手册和参考指南 CodeMirror is a code-editor component that can be embedded in Web pages. The core library provides only the editor component, no accompanying buttons, auto-completion, or other IDE functio…

iOS中alloc与init

面向对象的3大特性,封装继承和多态. 我遇到过封装相关的问题,因为初级封装简单,常常暴露出被你封装的接口,进一步进行高级封装隐藏接口的时候才发现,封装是一门学问,而这门学问得从最基础的alloc与init讲起. FatherModel.h #import <Foundation/Foundation.h> @interface FatherModel : NSObject @end FatherModel.m #import "FatherModel.h" @impleme…

JVM Specification 9th Edition (4) Chapter 4. The class File Format

Chapter 4. The class File Format Table of Contents 4.1. The ClassFile Structure 4.2. Names 4.2.1. Binary Class and Interface Names 4.2.2. Unqualified Names 4.2.3. Module and Package Names 4.3. Descriptors 4.3.1. Grammar Notation 4.3.2. Field Descript…

How `new’ operator works ?

这是2013年写的一篇旧文,放在gegahost.net上面 http://raison.gegahost.net/?p=15 February 15, 2013 How `new’ operator works ? Filed under: c++ — Tags: C++ internal, c++ memory layout, c++ new, POD, virtual class — Raison @ 12:38 am (original works by Peixu Zhu) For s…

Java多线程编程那些事:volatile解惑--转

http://www.infoq.com/cn/articles/java-multi-thread-volatile/ 1. 前言 volatile关键字可能是Java开发人员“熟悉而又陌生”的一个关键字.本文将从volatile关键字的作用.开销和典型应用场景以及Java虚拟机对volatile关键字的实现这几个方面为读者全面深入剖析volatile关键字. volatile字面上有“挥发性的,不稳定的”意思,它是用于修饰可变共享变量(Mutable Shared Variable)的一个关…

[TypeScript] Creating a Class in TypeScript

Typescript classes make traditional object oriented programming easier to read and write. In this lesson we learn about class syntax, what the constructor is and some interesting variable features. interface Opponent { health: number; alias: string;…

InnoDB On-Disk Structures（三）--Tablespaces (转载）

转载.节选于 https://dev.mysql.com/doc/refman/8.0/en/innodb-tablespace.html This section covers topics related to InnoDB tablespaces. 1.The System Tablespace The InnoDB system tablespace is the storage area for the doublewrite buffer and the change buffer.…

Golang面向并发的内存模型

Import Advanced Go Programming 1.5 面向并发的内存模型在早期,CPU都是以单核的形式顺序执行机器指令.Go语言的祖先C语言正是这种顺序编程语言的代表.顺序编程语言中的顺序是指:所有的指令都是以串行的方式执行,在相同的时刻有且仅有一个CPU在顺序执行程序的指令. 随着处理器技术的发展,单核时代以提升处理器频率来提高运行效率的方式遇到了瓶颈,目前各种主流的CPU频率基本被锁定在了3GHZ附近.单核CPU的发展的停滞,给多核CPU的发展带来了机遇.相应地,编程语言也…

C# ThreadLocal源码追踪

ThreadLocal 字段成员: private Func<T>? _valueFactory; 一个获取默认值的委托不同线程共享此成员. [ThreadStatic] private static LinkedSlotVolatile[]? ts_slotArray; ThreadStatic特性,这不就是我们熟悉的ThreadStaticAttribute吗, 所以ThreadLocal 就是一个ThreadStatic的封装类,简化了tls操作 [ThreadStatic] priv…

七. Go并发编程--sync.Once

一.序单从库名大概就能猜出其作用.sync.Once使用起来很简单, 下面是一个简单的使用案例 package main import ( "fmt" "sync" ) func main() { var ( once sync.Once wg sync.WaitGroup ) for i := 0; i < 10; i++ { wg.Add(1) // 这里要注意讲i显示的当参数传入内部的匿名函数 go func(i int) { defer wg.Don…

pg_probackup

[1] https://postgrespro.com/docs/enterprise/13/app-pgprobackup PITR依赖continuous WAL archiving: Making backups in PAGE backup mode, performing PITR and making backups with ARCHIVE WAL delivery mode require continuous WAL archiving to be enabled. You c…