JS数据分析数据去重及参数序列化示例_JavaScript_

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) } }