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overflow-hidden pt-1 is-graph-loading graph-canvas calendar-graph height-full text-center" data-graph-url="/users/Zfour/contributions?to=2020-10-29" data-url="/Zfour" data-from="2019-10-27 00:00:00 UTC" data-to="2020-10-29 23:59:59 UTC" data-org><svg class="js-calendar-graph-svg" width="100%" viewBox="0 0 770 128"><text class="month" :x="32 + monthindex*64" y="20" v-for="(month,monthindex) in monthchange">{{month}}</text><text class="wday" text-anchor="start" dx="0" dy="40"> 日</text><text class="wday" text-anchor="start" dx="0" dy="65"> 二</text><text class="wday" text-anchor="start" dx="0" dy="90"> 四</text><text class="wday" text-anchor="start" dx="0" dy="115">六</text><g v-for="(weekitem,weekIndex) in data" :transform="'translate('+ (16 + weekIndex*14) + ',' + '0)'"><rect @mouseover="selectStyle(dayitem,$event)" @mouseleave="outStyle()" v-for="(dayitem,dayIndex) in weekitem" :style="{fill:thiscolor(dayitem.count),shapeRendering:crispedges}" :data-score="dayitem.count" :data-date="dayitem.date" x="0" :y=" 30 + dayIndex*13 " width="11" height="11"></rect></g></svg></div><div class="contrib-footer clearfix mt-1 mx-3 px-3 pb-1"><div class="float-left text-gray">数据来源 <a :href="'https://github.com/'+ user " target="blank">@{{user}}</a></div><div class="contrib-legend text-gray" title="A summary of pull requests, issues opened, and commits to the default and gh-pages branches.">Less<ul class="legend"><li :style="{backgroundColor:color[0]}"></li><li :style="{backgroundColor:color[2]}"></li><li :style="{backgroundColor:color[4]}"></li><li :style="{backgroundColor:color[6]}"></li><li :style="{backgroundColor:color[8]}"></li></ul>More</div></div></div></div><div class="contrib-column contrib-column-first table-column"><span class="text-muted">过去一年提交</span><span class="contrib-number">{{total}}</span><span class="text-muted">{{oneyearbeforeday}} - {{thisday}}</span></div><div class="contrib-column table-column"><span class="text-muted">最近一月提交</span><span class="contrib-number">{{thisweekdatacore}}</span><span class="text-muted">{{amonthago}} - {{thisday}}</span></div><div class="contrib-column table-column"><span class="text-muted">最近一周提交</span><span class="contrib-number">{{weekdatacore}}</span><span class="text-muted">{{aweekago}} - {{thisday}}</span></div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/posts/64063/" title="【JavaSE基础】Java 基础知识"><img class="post-bg" src="https://j2os.org/images/java-se.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="【JavaSE基础】Java 基础知识"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/64063/" title="【JavaSE基础】Java 基础知识">【JavaSE基础】Java 基础知识</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-08-04T13:41:23.000Z" title="发表于 2024-08-04 21:41:23">2024-08-04</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/JavaSE/">JavaSE</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/JavaSE%E7%9F%A5%E8%AF%86%E7%82%B9%E6%80%BB%E7%BB%93/">JavaSE知识点总结</a></span></div><div class="content">Java 转义字符Java 常用的转义字符
在控制台，输入 tab 键，可以实现命令补全
转义字符
含义
作用
\t
制表符
一个制表位，实现对齐的功能\n ：换行符
\n
换行符
一个换行符
\r
回车符
一个回车键 System.out.println(“韩顺平教育\r 北京”);
\”
双引号
一个"
\’
单引号
一个'
\
反斜杠
一个\
Java 转义字符的使用//演示转义字符的使用public class 转义字符的使用 { //编写一个main方法 public static void main(String[] args) { //\t ：一个制表位，实现对齐的功能 System.out.println("北京\t天津\t上海"); // \n ：换行符 System.out.println("jack\nsmith\nmary"); // \\ ：一个\ \ ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/9023/" title="【JavaSE基础】Java 快速入门"><img class="post-bg" src="https://j2os.org/images/java-se.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="【JavaSE基础】Java 快速入门"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/9023/" title="【JavaSE基础】Java 快速入门">【JavaSE基础】Java 快速入门</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-08-01T06:06:46.000Z" title="发表于 2024-08-01 14:06:46">2024-08-01</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/JavaSE/">JavaSE</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/JavaSE%E7%9F%A5%E8%AF%86%E7%82%B9%E6%80%BB%E7%BB%93/">JavaSE知识点总结</a></span></div><div class="content">快速入门需求说明要求开发一个 Hello.java 程序，可以输出 “hello,world!”
开发步骤1) 将 Java 代码编写到扩展名为 Hello.java 的文件中。[代码说明]
2) 通过 javac 命令对该 java 文件进行编译，生成 .class 文件。
3) 通过 java 命令对生成的 class 文件进行运行。
运行原理示意图
Java 开发快速入门Java执行流程分析
什么是编译
javac Hello.java
1) 有了java源文件，通过编译器将其编译成JVM可以识别的字节码文件（.class文件）。
2) 在该源文件目录下，通过javac编译工具对Hello.java文件进行编译。
3) 如果程序没有错误，没有任何提示，但在当前目录下生成了Hello.class文件，该文件称为字节码文件，也是可以执行java的程序。
什么是运行
java Hello
1) 有了可执行的java程序（Hello.class字节码文件）
2) 通过运行工具java.exe对字节码文件进行执行，本质就是 .class
Java 开发注意事项和细节说明对修改后的 ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/posts/18950/" title="【JavaSE基础】Java 语言概述"><img class="post-bg" src="https://j2os.org/images/java-se.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="【JavaSE基础】Java 语言概述"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/18950/" title="【JavaSE基础】Java 语言概述">【JavaSE基础】Java 语言概述</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-07-31T03:54:06.000Z" title="发表于 2024-07-31 11:54:06">2024-07-31</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/JavaSE/">JavaSE</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/JavaSE%E7%9F%A5%E8%AF%86%E7%82%B9%E6%80%BB%E7%BB%93/">JavaSE知识点总结</a></span></div><div class="content">目录：
Java历史
Java重要特点
Java的开发工具
Java的工具选择
Java运行机制及运行过程
什么是 JDK，JRE
Java历史什么是程序程序：计算机执行某些操作或解决某个问题而编写的一系列有序指令的集合
举例说明：
编写一个简单的Java程序：
public class test { public static void main(String[] args) { int res = 1 + 1; //显示 System.out.println("结果=" + res); }}
运行该程序，输出结果为：
结果=2
Java诞生的小故事
Java背景知识
Java是美国 sun 公司（Stanford University Network）在1995年推出的一门计算机高级编程语言。
Java 早期称为Oak(橡树)，后期改名为Java。
Java 之父：詹姆斯·高斯林(James Gosling)。
20 ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/52027/" title="Windows下Java环境配置教程"><img class="post-bg" src="https://j2os.org/images/java-se.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Windows下Java环境配置教程"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/52027/" title="Windows下Java环境配置教程">Windows下Java环境配置教程</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-07-27T08:03:07.000Z" title="发表于 2024-07-27 16:03:07">2024-07-27</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/JavaSE/">JavaSE</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/JavaSE%E7%9F%A5%E8%AF%86%E7%82%B9%E6%80%BB%E7%BB%93/">JavaSE知识点总结</a></span></div><div class="content">前言这篇博客介绍Java环境的配置，主要是下载JDK，安装JDK，以及path、JAVA_hOME、CLASSPAT的配置，还会介绍配置这些的原因。
JDK的安装下载JDK首先，你需要到Oracle官网下载Java Development Kit (JDK)安装包。
下载JDK的步骤如下第1步: 进入网站 ——>
第2步: 选择你需要的JDK版本，比如我这里选择的是JDK 8u411(简称JDK 8)，JDK 17。下面分别演示两个版本的下载过程。
JDK 17
JDK 8u411
注意：官网下载JDK 8u411，可能会提示你需要注册登录Oracle账号，这里注册Oracle账号比较麻烦，接下来我给大家提供一个网址，里面有免注册的共用Oracle账号。
Oracle免注册账号
安装JDK
安装JDK，点击下载好的安装包，运行setup.exe文件，按照提示一步步安装即可。
建议：安装路径不要有中文或者空格等特殊符号，否则可能会导致配置环境变量失败。
安装步骤(以JDK 17为例，安装JDK 8u411的步骤类似)：
（1）双击jdk-17-windows-x ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/posts/59157/" title="打开PR世界的大门"><img class="post-bg" src="https://tse3-mm.cn.bing.net/th/id/OIP-C.H-bKDe3qG7Thw7rTqdhg8gHaEL?w=268&h=180&c=7&r=0&o=5&dpr=1.5&pid=1.7" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="打开PR世界的大门"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/59157/" title="打开PR世界的大门">打开PR世界的大门</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-07-18T10:39:00.000Z" title="发表于 2024-07-18 18:39:00">2024-07-18</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/PR%E5%89%AA%E8%BE%91%E5%AD%A6%E4%B9%A0/">PR剪辑学习</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/PR%E5%89%AA%E8%BE%91/">PR剪辑</a></span></div><div class="content">关于PR
Pr项目工程文件的后缀
注意:
工程文件兼容性：
(1) PR工程文件后缀为.prproj，请勿修改。
(2) 工程文件中，向下兼容 不向上兼容。即，新版本的PR软件可以打开旧版本的工程文件，但旧版本的PR软件不能打开新版本的工程文件。
</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/22439/" title="多元函数微分学"><img class="post-bg" src="https://www.toopic.cn/public/uploads/small/1704204476635170420447631.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="多元函数微分学"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/22439/" title="多元函数微分学">多元函数微分学</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-06-26T11:55:44.000Z" title="发表于 2024-06-26 19:55:44">2024-06-26</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E9%AB%98%E7%AD%89%E6%95%B0%E5%AD%A6-%E4%B8%8B-%E5%A4%8D%E4%B9%A0/">高等数学(下)复习</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/%E5%A4%9A%E5%85%83%E5%87%BD%E6%95%B0%E5%BE%AE%E5%88%86%E5%AD%A6%E9%A2%98%E5%9E%8B%E6%80%BB%E7%BB%93/">多元函数微分学题型总结</a></span></div><div class="content">二元函数极限与连续性
等价无穷小点的替换:
例题-1:
例题-2:(了解)
如何求二重极限
求偏导数和二阶偏导数
求导公式:
一阶偏导数例题:
二阶偏导数例题:
技巧:
例题:
求全微分
全微分计算公式:
全微分求解:
例题:
求复合函数的偏导
复合函数求偏导:
例题:
隐函数求偏导数
隐函数求偏导数:
例题:
求多元函数极值
极值定理:
例题:
方向导数与梯度
求方向导数:
例题:
求梯度:
例题:
求在点处的最大方向导数:
连续，可偏导，可微分，方向导数的关系
关系金字塔(强能推弱-平级之间也不能相互推导):
例题:
隐函数存在定理(了解)
隐函数存在定理:
例题:
</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/posts/34027/" title="无穷级数"><img class="post-bg" src="https://www.toopic.cn/public/uploads/small/1708925732730170892573286.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="无穷级数"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/34027/" title="无穷级数">无穷级数</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-06-25T11:14:57.000Z" title="发表于 2024-06-25 19:14:57">2024-06-25</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E9%AB%98%E7%AD%89%E6%95%B0%E5%AD%A6-%E4%B8%8B-%E5%A4%8D%E4%B9%A0/">高等数学(下)复习</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/%E6%97%A0%E7%A9%B7%E7%BA%A7%E6%95%B0%E9%A2%98%E5%9E%8B%E6%80%BB%E7%BB%93/">无穷级数题型总结</a></span></div><div class="content">
当拿到我们拿到一个无穷级数的题目时，下面就来总结一下无穷级数的判别方法。
用定义判定级数收敛性
数项级数敛散性判定
收敛级数的基本性质
使用常用结论判别敛散性
正项级数敛散性判别法
技巧:
例题:
使用比值判别法和根值判别法判别收敛性
技巧:
例题:
交错级数敛散性判别法
技巧:
例题:
绝对收敛和条件收敛判别法
技巧:
例题:
幂级数总结:
幂级数求收敛域(收敛区间)
题型1:
技巧:
例题:
题型2:
技巧:
例题:
题型3:
题库例题题目一 ——> P级数的收敛性判别法，P > 1 ——> 收敛 ，P =< 1 ——> 发散
P级数的收敛性判别法 ——>
题目二 ——> 收 + 发 = 发 ，补充: 收 + 收 = 收，发 + 发 = 不确定
题目三 ——> 限定在某一个范围内，级数收敛
题目四 ——> 带入级数式子直接求解
题目五 ——> 级数收敛的必要条件
题目六 ——> 幂级数的收敛区间
技巧:
例题: ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/39261/" title="向量代数与空间解析几何"><img class="post-bg" src="https://www.toopic.cn/public/uploads/small/1704204476635170420447631.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="向量代数与空间解析几何"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/39261/" title="向量代数与空间解析几何">向量代数与空间解析几何</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-06-25T06:17:10.000Z" title="发表于 2024-06-25 14:17:10">2024-06-25</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E9%AB%98%E7%AD%89%E6%95%B0%E5%AD%A6-%E4%B8%8B-%E5%A4%8D%E4%B9%A0/">高等数学(下)复习</a></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/%E5%90%91%E9%87%8F%E4%BB%A3%E6%95%B0%E4%B8%8E%E7%A9%BA%E9%97%B4%E8%A7%A3%E6%9E%90%E5%87%A0%E4%BD%95%E9%A2%98%E5%9E%8B%E6%80%BB%E7%BB%93/">向量代数与空间解析几何题型总结</a></span></div><div class="content">题型总结:
空间向量向量的模
向量积
利用向量积求图形面积
空间平面方程平面的点法式方程
两平面的夹角
点到平面的距离
空间直线方程
直线的一般方程
空间直线对称式方程，空间直线的参数方程
旋转曲面方程
空间曲线在平面的投影
解题方法:
例题:
空间曲面的切平面和法线
题型1:
题型2:
空间曲线的切线和法平面
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