JS Tips

tips.js

// parse search query
const params = new URLSearchParams('?a=b');
params.get('a')

// querySelector with attribute
document.querySelector('div:not([data-role="head"])')

// online matrix
const matrix = new Array(10).fill(0).map((v, i) => (new Array(10).fill(0).map((vv, ii) => `r${i}c${ii}`)))

// querystring
const qs = {
  parse (search) {
    search = decodeURIComponent(search).replace(/^\?/, '')
    const query = _.reduce(search.split('&'), (query, item) => {
      const [key, value] = item.split('=')
      query[key] = value
      return query
    }, {})
    return query
  },
  stringify (query) {
    let search = _.reduce(Object.keys(query), (search, key) => {
      search += `${key}=${query[key]}&`
      return search
    }, '')
    search = search.replace(/&$/, '')
    return search
  }
}

// random Chinese
String.fromCharCode(19968 + Math.floor(Math.random() * (40869-19968)))