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<h2 id="Git简介"><a href="#Git简介" class="headerlink" title="Git简介"></a>Git简介</h2><p>Git和其他版本控制系统如SVN的一个不同之处就是有暂存区的概念。</p>
<h3 id="术语解释"><a href="#术语解释" class="headerlink" title="术语解释"></a>术语解释</h3><p><img src="http://www.yiibai.com/uploads/images/201707/1207/683090701_88630.jpg" alt=""></p>
<p><strong>Workspace</strong>：工作区</p>
<p><strong>Index/Stage</strong>：暂存区，也叫索引<br></p>
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<a href="/66907237.html" class="post-title-link" itemprop="http://liboy.site/index.html">iOS-内存管理</a>
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<h2 id="内存中的五大区域"><a href="#内存中的五大区域" class="headerlink" title="内存中的五大区域"></a>内存中的五大区域</h2><p><img src="https://ws1.sinaimg.cn/large/006tNc79ly1g2bphg7oxoj30jg03njrh.jpg" alt=""></p>
<ul>
<li>栈区(stack)：</li>
<li>存放函数的参数值、局部变量的值等，</li>
<li>由编译器自动分配释放，通常在函数执行结束后就释放了，其操作方式类似数据结构中的栈。</li>
<li>栈内存分配运算内置于处理器的指令集，效率很高。</li>
<li>分配的内存容量有限，比如iOS中栈区的大小是512k。</li>
<li>堆区(heap)</li>
<li>C 语言使用 malloc、calloc、realloc 函数分配的空间，需要使用 free 函数释放</li>
<li>由程序员分配释放，若程序员不释放，会出现内存泄漏</li>
<li>分配方式类似于链表。</li>
<li>堆区的大小由系统决定，包括：系统内存／磁盘交换空间</li>
<li>静态区(BSS段)：全局变量和静态变量的存储是放在一块的，初始化的全局变量和静态变量在一块区域，未初始化的全局变量和未初始化的静态变量在相邻的另一块区域。程序结束后，由系统释放。</li>
<li>常量区(数据段)：常量存储在这里，不允许修改的。</li>
<li>代码区：存放函数体的二进制代码。</li>
</ul>
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