get请求方式参数的分离

  let str1 = 'http://item.taobao.com/item.htm?a=1&b=2&c=&d=xxx&e=undefined'
    function unique(str) {
      let json = {}
      let arr = str.split('?')[1].split('&')
      for (var i = 0; i < arr.length; i++) {
        let arr1 = arr[i].split('=')
        json[arr1[0]] = arr1[1]
      }
      return json
    }