function param(data) {
  let url = ''
  for (var k in data) {
    let value = data[k] !== undefined ? data[k] : ''
    url += '&' + k + '=' + encodeURIComponent(value)
  }
  //去除第一个&
  return url ? url.substring(1) : ''
}

function url(url,data){
  url += (url.indexOf('?') < 0 ? '?' : '&') + param(data)
  return url;
}

console.log(url("https://www.baidu.com",{a:1,b:2}))

 

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