解析url参数

1 split + map

function parse(url){
  let obj={}
  url.slice(url.indexOf('?')+1)
     .split('&')
     .map(i=>{
     let [k,v]=i.split('=')
     obj[k]=v
     })
  return obj
}
let url = "http://www.xxx.com?a=1&b=2&c=3"
let result = parse(url);
console.log(result);
// { a: '1', b: '2', c: '3' }

2 split + reduce

function parse(url){
  return url.slice(url.indexOf('?')+1)
         .split('&')
         .reduce((acc,cur)=>{
           let[k,v]=cur.split('=')
           acc[k]=v
           return acc
     },{})
}
let url = "http://www.xxx.com?a=1&b=2&c=3"
let result = parse(url);
console.log(result);
// { a: '1', b: '2', c: '3' }