/** 
 * 对象转 Post 字符串   
 * @param Obj 需要转换的对象 
 * @returns 返回 'a=b&c=d&e=f' 的字符串格式 
 */
const PostList = (Obj: object) => {
  let r_string = '', i = 0, FenGe: string;
  for (let item of Object.entries(Obj)) { 
    FenGe = i > 0 ? '&' : ''; 
    i++; 
    r_string += FenGe + item[0] + '=' + item[1]; 
  }
  return r_string;
}

let Post_Content = {
  ID: 1,
  Name: '枭龙',
  EnName: 'Lucas',
}

console.log(PostList(Post_Content));

打印结果

ID=1&Name=枭龙&EnName=Lucas