new URLSearchParams(obj)

• obj <Object> 表示一组键值对的对象

使用查询哈希映射实例化一个新的 URLSearchParams 对象。obj 的每个属性的键和值总是被强制转换为字符串。

🌐 Instantiate a new URLSearchParams object with a query hash map. The key and value of each property of obj are always coerced to strings.

与 querystring 模块不同，表单中不允许出现作为数组值的重复键。数组使用 array.toString() 转换为字符串，方法是将所有数组元素用逗号连接。

🌐 Unlike querystring module, duplicate keys in the form of array values are not allowed. Arrays are stringified using array.toString(), which simply joins all array elements with commas.

const params = new URLSearchParams({
  user: 'abc',
  query: ['first', 'second']
});
console.log(params.getAll('query'));
// Prints [ 'first,second' ]
console.log(params.toString());
// Prints 'user=abc&query=first%2Csecond' 拷贝