对象和URL字符串相互转换

对象转ur字符串

例如： {a:1,b:2}转为‘a=1&b=2’

    const obj = {a:1,b:2}
    const searchParams = new URLSearchParams(obj)
    searchParams.toString() //'a=1&b=2'

url字符串转对象

例如：‘a=1&b=2’转为 {a:1,b:2}

    const str = ‘a=1&b=2’
    const searchParams = new URLSearchParmas(str)
    Object.fromEntries(searchParams) //{a: '1', b: '2'}