来自ajax字符串的Javascript键值[重复]

I have a string returned from php ajax page like this:

$returnString = "firstName=" . $row['firstName'] . "&lastName=" 
  .$row['lastName'] . "&address=" . $row['address'] . "&province_id=" 
  .$row['province_id'] . "&city_id=" . $row['city_id'];

so on my calling page I get the string returned to :

var newCompleteString = this.responseText;

I am trying to figure out the best way to parse the string into a key: value array

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What you want seems to be basically the same as parsing the query string.

See this question How can I get query string values in JavaScript?

const getParams = query => {
  if (!query) {
    return { };
  }

  return (/^[?#]/.test(query) ? query.slice(1) : query)
    .split('&')
    .reduce((params, param) => {
      let [ key, value ] = param.split('=');
      params[key] = value ? decodeURIComponent(value.replace(/\+/g, ' ')) : '';
      return params;
    }, { });
};

console.log(
  getParams('firstName=first&lastName=last&address=addr&province_id=322&city_id=11')
);

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