new URLSearchParams(obj)

• obj <Object> 表示键值对集合的对象

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

与 querystring 模块不同，不允许以数组值的形式出现重复的键。 数组使用 array.toString() 字符串化，它简单地用逗号连接所有数组元素。

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

• obj <Object> An object representing a collection of key-value pairs

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

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'