## URLSearchParams Map-like representation of url search parameters, based on [URLSearchParams](https://url.spec.whatwg.org/#urlsearchparams) in the url living standard, with several extensions for merging URLSearchParams objects: setAll() appendAll() replaceAll() This class accepts an optional second parameter of $`QueryEncoder`, which is used to serialize parameters before making a request. By default, QueryEncoder encodes keys and values of parameters using encodeURIComponent, and then un-encodes certain characters that are allowed to be part of the query according to IETF RFC 3986: https://tools.ietf.org/html/rfc3986. These are the characters that are not encoded: ! $ \' ( ) * + , ; A 9 - . _ ~ ? / If the set of allowed query characters is not acceptable for a particular backend, QueryEncoder can be subclassed and provided as the 2nd argument to URLSearchParams. ```typescript import {URLSearchParams, QueryEncoder} from '@angular/http'; class MyQueryEncoder extends QueryEncoder { encodeKey(k: string): string { return myEncodingFunction(k); } encodeValue(v: string): string { return myEncodingFunction(v); } } let params = new URLSearchParams('', new MyQueryEncoder()); ``` ### 类定义 ```typescript class URLSearchParams { constructor(rawParams?: string, queryEncoder?: QueryEncoder) paramsMap : Map<string, string[]> rawParams : string clone() : URLSearchParams has(param: string) : boolean get(param: string) : string getAll(param: string) : string[] set(param: string, val: string) setAll(searchParams: URLSearchParams) append(param: string, val: string) : void appendAll(searchParams: URLSearchParams) replaceAll(searchParams: URLSearchParams) toString() : string delete(param: string) : void } ``` ### 属性 - paramsMap : Map<`string`, `string[]`> - rawParams : string - clone() : URLSearchParams - has(param: string) : boolean - get(param: string) : string - getAll(param: string) : string[] - set(param: string, val: string) - setAll(searchParams: URLSearchParams) - append(param: string, val: string) : void - appendAll(searchParams: URLSearchParams) - replaceAll(searchParams: URLSearchParams) - toString() : string - delete(param: string) : void