提取出url 里的参数并转成对象

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function getUrlParams(url){
  let reg = /([^?&=]+)=([^?&=]+)/g
  let obj = { }
  url.replace(reg, function(){
      obj[arguments[1]] = arguments[2]
  })
  // 或者
  const search = window.location.search
  search.replace(/([^&=?]+)=([^&]+)/g, (m, $1, $2)=>{obj[$1] = decodeURIComponent($2)})
  
  return obj
}
let url = 'https://www.junjin.cn?a=1&b=2'
console.log(getUrlParams(url)) // { a: 1, b: 2 }