Александра Синицына (Ночной линейный редактор)
* 时间复杂度：O(len1 + len2)，空间复杂度：O(len2)（栈+Map的空间），更多细节参见旺商聊官方下载
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让我们来分解一下：<start_function_call — 函数调用开始，call: — 前缀，change_background_color — 函数名，{color:<escapered<escape} — 带转义标记的参数，<end_function_call — 函数调用结束。。爱思助手下载最新版本是该领域的重要参考