<html lang="zh-cn">
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="referrer" content="origin-when-crossorigin" />
    
    
    <meta http-equiv="Cache-Control" content="no-transform" />
    <meta http-equiv="Cache-Control" content="no-siteapp" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <title>初雨了然 - 博客园</title>
    <link id="favicon" rel="shortcut icon" href="//common.cnblogs.com/favicon.svg" type="image/svg+xml" />
    
    <link rel="stylesheet" href="/css/blog-common.min.css?v=T5GfHDdyO5FBvcEuNL9Tc-R5TBaPvcsDtO6-GYsEVpk" />
    
    
    <link type="text/css" rel="stylesheet" href="https://www.cnblogs.com/chenjiajiale/custom.css?v=dbMGlvYDbjN2UVvW4QG9Z0STuho=" />
    <link id="mobile-style" media="only screen and (max-width: 767px)" type="text/css" rel="stylesheet" href="/skins/SimpleMemory/bundle-SimpleMemory-mobile.min.css" />
    
    <link type="application/rss+xml" rel="alternate" href="https://www.cnblogs.com/chenjiajiale/rss" />
    <link type="application/rsd+xml" rel="EditURI" href="https://www.cnblogs.com/chenjiajiale/rsd.xml" />
    <link type="application/wlwmanifest+xml" rel="wlwmanifest" href="https://www.cnblogs.com/chenjiajiale/wlwmanifest.xml" />
    <script>
        var currentBlogId = 578508;
        var currentBlogApp = 'chenjiajiale';
        var cb_enable_mathjax = false;
        var isLogined = true;
        var isBlogOwner = false;
        var skinName = 'SimpleMemory';
        var visitorUserId = '2db91a3c-0df5-41d7-1a18-08d9bb01539c';
        var hasCustomScript = true;
        try {
            if (hasCustomScript && document.referrer && document.referrer.indexOf('baidu.com') >= 0) {
                Object.defineProperty(document, 'referrer', { value: '' });
                Object.defineProperty(Document.prototype, 'referrer', { get: function(){ return ''; } });
            }
        } catch(error) { }
        window.codeHighlightEngine = 1;
        window.enableCodeLineNumber = false;
        window.codeHighlightTheme = 'cnblogs';
    </script>
    <script src="https://common.cnblogs.com/scripts/jquery-2.2.0.min.js"></script>
    <script src="/js/blog-common.min.js?v=_VJOqWATc0TAviQOjnzT22LUj1TTDFPkKzsBT_F3qYI"></script>
    
    
    
</head>
<body class="skin-simplememory no-navbar">
    <a name="top"></a>
    <div id="top_nav" class="navbar forpc navbar-custom">
        <nav id="nav_main" class="navbar-main">
            <ul id="nav_left" class="navbar-list navbar-left">
                <li class="navbar-branding"><a href="https://www.cnblogs.com/" title="开发者的网上家园"><img src="/images/logo.svg?v=R9M0WmLAIPVydmdzE2keuvnjl-bPR7_35oHqtiBzGsM" alt="博客园Logo" /></a></li>
                <li><a href="/" onclick="countClicks('skin-navbar-sitehome')">首页</a></li>
                <li><a href="https://news.cnblogs.com/" onclick="countClicks('nav', 'skin-navbar-news')">新闻</a></li>
                <li><a href="https://q.cnblogs.com/" onclick="countClicks('nav', 'skin-navbar-q')">博问</a></li>
                <li><a id="nav_brandzone" href="https://brands.cnblogs.com/" onclick="countClicks('nav', 'skin-navbar-brands')">专区</a></li>
                <li><a href="https://ing.cnblogs.com/" onclick="countClicks('nav', 'skin-navbar-ing')">闪存</a></li>
                <li><a href="https://edu.cnblogs.com/" onclick="countClicks('nav', 'skin-navbar-edu')">班级</a></li>
            </ul>
            <ul id="nav_right" class="navbar-list navbar-right">
                <li>
                    <form id="zzk_search" class="navbar-search" action="https://zzk.cnblogs.com/s" method="get">
                        <input name="w" id="zzk_search_input" placeholder="代码改变世界" type="text" tabindex="3" />
                        <button type="submit" id="zzk_search_button">
                            <img src="/images/aggsite/search.svg" alt="搜索" />
                        </button>
                    </form>
                </li>
                <li id="navbar_login_status" class="navbar-list">
                    <a class="navbar-user-info navbar-blog" href="https://i.cnblogs.com/EditPosts.aspx?opt=1" alt="写随笔" title="写随笔">
                        <img id="new_post_icon" class="navbar-icon" src="/images/aggsite/newpost.svg" alt="写随笔" />
                    </a>
                    <a id="navblog-myblog-icon" class="navbar-user-info navbar-blog" href="https://passport.cnblogs.com/GetBlogApplyStatus.aspx" alt="我的博客" title="我的博客">
                        <img id="myblog_icon" class="navbar-icon" src="/images/aggsite/myblog.svg" alt="我的博客" />
                    </a>
                    <a class="navbar-user-info navbar-message navbar-icon-wrapper" href="https://msg.cnblogs.com/" alt="短消息" title="短消息">
                        <img id="msg_icon" class="navbar-icon" src="/images/aggsite/message.svg?v=J0WS2P2iPgaIVgXxcAhliw4AFZIpaTWxtdoNAv9eiCA" alt="短消息" />
                        <span id="msg_count" style="display: none"></span>
                    </a>
                    <div id="user_info" class="navbar-user-info dropdown">
                        <a class="dropdown-button" href="https://home.cnblogs.com/">
                            <img id="user_icon" class="navbar-avatar" src="/images/aggsite/avatar-default.svg" alt="用户头像" />
                        </a>
                        <div class="dropdown-menu">
                            <a id="navblog-myblog-text" href="https://passport.cnblogs.com/GetBlogApplyStatus.aspx">我的博客</a>
                            <a href="https://home.cnblogs.com/">我的园子</a>
                            <a href="https://account.cnblogs.com/settings/account">账号设置</a>
                            <a href="javascript:void(0)" id="navbar_lite_mode_toggle" title="简洁模式会使用简洁款皮肤显示所有博客">
    简洁模式 <img id="navbar_lite_mode_on" src="/images/lite-mode-check.svg" class="hide" /><span id="navbar_lite_mode_spinner" class="hide">...</span>
</a>
                            <a href="javascript:void(0)" onclick="account.logout();">退出登录</a>
                        </div>
                    </div>
                    <a class="navbar-anonymous" href="https://account.cnblogs.com/signup/">注册</a>
                    <a class="navbar-anonymous" href="javascript:void(0);" onclick="account.login()">登录</a>
                </li>
            </ul>
        </nav>
    </div>

    <div id="page_begin_html">
        <div class="pio-container" style="left: 50px; bottom: 50px;">
	<div class="pio-action"></div>
	<canvas id="pio" style="opacity: 0.6;" width="200px" height="200px"></canvas>
</div>
<canvas id="content_canvas" width="1440" height="900" style="opacity:0.7;" ></canvas>
    </div>
    <!--done-->
<div id="home">
<div id="header">
	<div id="blogTitle">
        <a id="lnkBlogLogo" href="https://www.cnblogs.com/chenjiajiale/"><img id="blogLogo" src="/skins/custom/images/logo.gif" alt="返回主页" /></a>		
		
<!--done-->
<h1><a id="Header1_HeaderTitle" class="headermaintitle HeaderMainTitle" href="https://www.cnblogs.com/chenjiajiale/">初雨</a>
</h1>
<h2></h2>




		
	</div><!--end: blogTitle 博客的标题和副标题 -->
	<div id="navigator">
		
<ul id="navList">
<li><a id="blog_nav_sitehome" class="menu" href="https://www.cnblogs.com/">
博客园</a>
</li>
<li>
<a id="blog_nav_myhome" class="menu" href="https://www.cnblogs.com/chenjiajiale/">
首页</a>
</li>
<li>

<a id="blog_nav_newpost" class="menu" href="https://i.cnblogs.com/EditPosts.aspx?opt=1">
新随笔</a>
</li>
<li>
<a id="blog_nav_contact" class="menu" href="https://msg.cnblogs.com/send/%E5%88%9D%E9%9B%A8%E4%BA%86%E7%84%B6">
联系</a></li>
<li>
<a id="blog_nav_rss" class="menu" href="javascript:void(0)" data-rss="https://www.cnblogs.com/chenjiajiale/rss/">
订阅</a>
<!--<partial name="./Shared/_XmlLink.cshtml" model="Model" /></li>--></li>
<li>
<a id="blog_nav_admin" class="menu" href="https://i.cnblogs.com/">
管理</a>
</li>
</ul>


		<div class="blogStats">
			<div id="blog_stats_place_holder"><script>loadBlogStats();</script></div>
		</div><!--end: blogStats -->
	</div><!--end: navigator 博客导航栏 -->
</div><!--end: header 头部 -->
<div id="main">
	<div id="mainContent">
	<div class="forFlow">
		





		


<div class="day">
    <div class="dayTitle">
        <a href="https://www.cnblogs.com/chenjiajiale/archive/2021/10/19.html">2021年10月19日</a>
    </div>

        <div class="postTitle">
            

<a class="postTitle2 vertical-middle" href="https://www.cnblogs.com/chenjiajiale/p/15423578.html">
    <span>