[区块链]03_开发记录

记录js中对象、数组

对象

{
  infrastructure: 21,
  wallet: 3,
  dapp: 19,
  explorer: 4,       
  social: 3,
  tooling: 4,
  defi: 11,
  nft: 5,
  dex: 3,
  community: 5,
  work: 3,
  game: 3
}

对于对象的取值：

for (let tag in tags) {
	console.log(tags[tag])
}

json格式

[
	{
	        "id": "dl",
	        "title": "Departure Labs",
	        "url": "https://github.com/DepartureLabsIC/non-fungible-token",
	        "tags": "Dapp,NFT",
	        "website": "https://github.com/DepartureLabsIC/non-fungible-token",
	    },
    {
        "id": "axon",
        "title": "Axon",
        "url": "https://axon.ooo/",
        "tags": "Infrastructure",
        "website": "https://axon.ooo/",
    }
] 

js引入json文件（这只是一种）

const fs = require('fs')
const path = require('path')
try {
    const projectfile = path.resolve(__dirname, '../data/projectData.json')
    const projectDataContent = fs.readFileSync(projectfile)
    projectData = JSON.parse(projectDataContent)
} catch (error) {
    console.log(error)
}

遍历json，将tags全部取出，放到一个数组里。

let alltags = []
projectData.forEach((data) => {
        if (data) {
            alltags = alltags.concat(data.tags.split(','))
        }
    })

取出的alltags:

[
  'Infrastructure', 'Infrastructure', 'Infrastructure', 'Infrastructure',
  'Wallet',         'Infrastructure', 'Wallet',         'Dapp',
  'Infrastructure', 'Explorer',       'Infrastructure', 'Explorer',
  'Infrastructure', 'Explorer',       'Infrastructure', 'Explorer',
  'Dapp',           'Social',         'Dapp',           'Social',
  'Infrastructure', 'Tooling',        'DeFi',           'Dapp',
  'NFT',            'DeFi',           'DeFi',           'Dex',
  'Infrastructure', 'DeFi',           'DeFi',           'DeFi',
  'Dex',            'DeFi',           'DeFi',           'DeFi',
  'Infrastructure', 'Dapp',           'Tooling',        'Infrastructure',
  'Dapp',           'Dapp',           'Tooling',        'Infrastructure',
  'Community',      'Community',      'Community',      'Community',
  'Community',      'Dapp',           'Work',           'Dapp',
  'Work',           'Infrastructure', 'Infrastructure', 'Dapp',
  'Work',           'Dapp',           'Social',         'Dapp',
  'Game',           'Dapp',           'Game',           'Dapp',
  'Game',           'Dapp',           'NFT',            'Dapp',
  'NFT',            'Dapp',           'NFT',            'Infrastructure',
  'Infrastructure', 'Wallet',         'Dapp',           'NFT',
  'Dapp',           'DeFi',           'Infrastructure', 'Tooling',
  'DeFi',           'Dex',            'Infrastructure', 'Infrastructure'
]

数组

统计数组中各个元素出现的个数。

var total = alltags.reduce((obj, name) => {
        const lowerName = name.toLowerCase()
        if (lowerName in obj) {
            obj[lowerName]++
        } else {
            obj[lowerName] = 1
        }
        return obj
    }, {})
    console.log(total)
    return total
}