remix 使用方法和 solidity入门
从 https://remix.ethereum.org/ 下载档案 // SPDX-License-Identifier: MIT pragma solidity ^0.8.4; contract HelloWeb3{ string public _string = "Hello Web3!"; } // 行是注释,其中标明这个代码所用的软件许可...
Hello, I’m geo
Designs, talks, and writes about web, ethics, privacy, and dev. I share dev tutorials, free resources and inspiration. Loves music & riding his bicycle.
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nodejs mongodb 更新数据
更新单笔数据 const { MongoClient } = require("mongodb"); // 1. 定义连接地址 const url = "mongodb://127.0.0.1:27017/"; const client = new MongoClient(url); async function run() { try { ...
nodejs mongodb 新增数据
新增一笔数据 const { MongoClient } = require("mongodb"); // 1. 定义连接地址 const url = "mongodb://127.0.0.1:27017/"; const client = new MongoClient(url); async function run() { try { ...
英文文章 Trees, Not Grass, Linked to Heart Health [可以复习]
Trees, Not Grass, Linked to Heart Health Research has suggested that living near to green spaces can be really good for our health. Green spaces are areas where there are things lik...
nodejs 快速入门以及连接mongodb
nodejs 下载nodejs sudo apt install nodejs npm 下载第三方套件库 sudo apt install npm mongodb 下载mongodb composs GUI , MongoDB Community Server 和 npm npm install mongodb 旧版写法 console...
英文文章 What is the Online 2016 Nostalgia Trend?[可以复习]
What is the Online 2016 Nostalgia Trend? Millions of people, particularly those in their 20s and 30s, are thinking about 2016 these days. Over the past few weeks, they have been sha...
购买美股 | ETF
巴菲特長期以來一直建議投資者將資金投入低成本指數基金(ETF) 常见 ETF 投资工具概览 股票代码 基金名称与描述 十年报酬率 SPY SPDR 标准普尔 500 指数 (SPY)：“SPDR”是追踪标准普尔 500 指数的现存最古老、最广为人知的...