markdown: {
        config: (md: MarkdownIt) => {
            md.use(require('markdown-it-container'), 'netease', {
                validate: function(params) {
                    return params.trim().match(/^netease\s+(.*)$/);
                },

                render: function (tokens, idx) {
                    const m = tokens[idx].info.trim().match(/^netease\s+(.*)$/);

                    if (tokens[idx].nesting === 1) {
                        return `<div id="music"><iframe style="border: 0; margin-left: -10px; width: 298px; height: 52px" src="//music.163.com/outchain/player?type=2&id=` + md.utils.escapeHtml(m[1]) + `&auto=1&height=32"></iframe></div>`;
                    } else {
                        return "";
                    }
                }
            });

            md.use(require('markdown-it-container'), 'youtube', {
                validate: function(params) {
                    return params.trim().match(/^youtube\s+(.*)$/);
                },

                render: function (tokens, idx) {
                    const m = tokens[idx].info.trim().match(/^youtube\s+(.*)$/);
                    if (tokens[idx].nesting === 1) {
                        return `<div id="video"><iframe style="width: 100%; height: 387px" type="text/html" src="https://www.youtube.com/embed/` + md.utils.escapeHtml(m[1]) + `?autoplay=1&loop=1&rel=0&showinfo=0&playlist=` + md.utils.escapeHtml(m[1]) + `" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe></div>`;
                    } else {
                        return "";
                    }
                }
            });
        }
    },

https://mp.weixin.qq.com/s/oAS-0NPm1q7D67gK47UcjA

详见操作文档：https://docsearch.algolia.com/docs/manage-your-crawls

ALTER TABLE `user` ADD `age` int NOT NULL DEFAULT '0' COMMENT '年龄', 
ALGORITHM=Inplace, 
LOCK=NONE;

来源：https://www.cnblogs.com/yidengjiagou/p/16769180.html

来源：https://segmentfault.com/a/1190000019710081

import csv

header = ['id', 'name', 'age']
data = [[1, 'zhangsan', 20], [2, 'lisi', 25]]

with open (filename, "w", newline='', encoding='utf-8') as csv_file :
    writer = csv.writer(csv_file)
    writer.writerow(header)
    writer.writerows(data)
    csv_file.close()

import requests
import json

headers = {'content-type': 'application/json'}
data = {'key':'value'}
response = requests.post(url,  json=data, headers=hd)
res = json.loads(response.text)

module.exports = {
    devServer: {
        proxy: {
            '/repos': {
                target: 'https://api.github.com', //接口域名
                changeOrigin: true,               //是否跨域
                ws: true,                         //是否代理 websockets
                secure: true,                     //是否https接口
                pathRewrite: {                    //路径重置
                    '^/repos': ''
                }
            }
        }
    }
};

public class SpringContextHolder implements ApplicationContextAware {
    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextHolder.applicationContext = applicationContext;
    }

    public static <T> T getBean(Class<T> clazz) {
        return applicationContext.getBean(clazz);
    }

    public static <T> T getBean(String name, Class<T> clazz) {
        return applicationContext.getBean(name, clazz);
    }
}

String classInfo = "Class=2,Teacher=Lisa,StudentNum=30";
// 该方法按照每单个字符逐个分割
System.out.println(StringUtils.split(classInfo, ",PC")[0]); // lass=2
// 该方法将字符串当成一个整体去分割
System.out.println(StringUtils.splitByWholeSeparator(classInfo, ",PC")[0]); // Class=2,Teacher=Lisa,StudentNum=30