Coding：解析url中的queryString

入参格式参考：

const url = "https://www.youzan.com?name=coder&age=20&callback=https%3A%2F%2Fyouzan.com%3Fname%3Dtest&list[]=a&list[]=b&json=%7B%22str%22%3A%22abc%22,%22num%22%3A123%7D"

出参格式参考：

{
  name: "coder",
  age: "20",
  callback: "https://youzan.com?name=test",
  list: ["a", "b"],
  json: {
    str: 'abc',
    num: 123
  }
}

参考

function parseQuery(url) {
    const obj = {}
    const searchParams = new URLSearchParams(new URL(url).search)
    for (let [key, value] of searchParams.entries()) {
        if (value.startsWith('{')) {
            value = JSON.parse(value)
        }
        if(!obj[key]) {
            obj[key] = value
        } else {
            // 如果存在多个值，把第一个存到数组
            if (!Array.isArray(obj[key])) {
                obj[key] = [obj[key]]
            }
            obj[key].push(value)
        }
    }
    return obj
}