JS数据分析数据去重及参数序列化示例

const set = new Set([2, 8, 3, 8, 5])

const uniqueness = (data, key) => {
  const hash = new Map()
  return data.filter(item => !hash.has(item[key]) && hash.set(item[key], 1))
}

/**
* @description: 对象转为查询字符串
* @params {Object} data: 源数据
* @return {String} 目标数据
* @example
*
*   serialize({ a: 1, b: 2 })
*   
*   a=1&b=2
*/

export const serialize = data => {
  return Object.keys(data).map(key => `${encodeURIComponent(key)}=${encodeURIComponent(data[key])}`).join('&')
}

/**
* @description: 获取查询参数
* @params {String} name: 查询参数名称
* @return {String} 目标数据
* @example
*
*   getQueryString('id')
*/

export const getQueryString = key => {
  return (new URLSearchParams(location.search)).get(key)
}

class Route {
  static url = new URL(location)
  static attr(attribute) {
    return this.url[attribute]
  }
  static getParams() {
    const { searchParams } = this.url, params = {}
    for (const [key, value] of searchParams.entries()) {
      params[key] = value
    }
    return params
  }
  static getParam(name) {
    const { searchParams } = this.url
    return searchParams.get(name)
  }
  static hasParam(name) {
    const { searchParams } = this.url
    return searchParams.has(name)
  }
}