如何在angular 4中将对象转换为application/x-www-form-urlencoded

import { URLSearchParams } from '@angular/http';

function objectToUrlEncoded(obj: any): string {
  const params = new URLSearchParams();
  for (const key in obj) {
    if (obj.hasOwnProperty(key)) {
      params.set(key, obj[key]);
    }
  }
  return params.toString();
}

const myObject = {
  name: 'John',
  age: 25,
  email: 'john@example.com'
};

const urlEncodedString = objectToUrlEncoded(myObject);
console.log(urlEncodedString);

name=John&age=25&email=john%40example.com