# Common Library Subsystem Changelog

## cl.commonlibrary.1 URLParams Class Changes
The constructor function of the **URLParams** class in the URL module of the common library subsystem is changed.

Specifically, **constructor(init?: string[][] | Record<string, string> | string | URLSearchParams)** is changed to **constructor(init?: string[][] | Record<string, string> | string | URLParams)**, and the parameter type is changed from **URLSearchParams** to **URLParams**.

You need to adapt your application.

**Change Impacts**

JS APIs in API version 9 are affected. Your application needs to adapt these APIs so that it can properly implement features in the SDK environment of the new version.

**Key API/Component Changes**

| Module                   | Class               | Method/Attribute/Enum/Constant                                         | Change Type|
| :------------------------ | ------------------- | ------------------------------------------------------------ | -------- |
| @ohos.url        | URLParams         | constructor(string[][] \| Record&lt;string, string&gt; \| string \| URLSearchParams) | Deleted |
| @ohos.url         | URLParams       | constructor(string[][] \| Record&lt;string, string&gt; \| string \| URLParams)| Changed |

**Adaptation Guide**

The following illustrates how to create a **URLParams** object in your application.

Example:

```ts
import url from '@ohos.url'
try {
    let params1 = new Url.URLParams('?user=abc&query=xyz')
    let params2 = new Url.URLParams(params1)
    var result= params2.toString()
    console.log(result) //"user=abc&query=xyz"
} catch (err) {
    console.error(`Fail to ceate URLParams.codeis${err.code},message is ${err.message}`);
}
```
## cl.commonlibrary.2 URL Attribute Changes of URLParams Class APIs
The URL attributes of the URL module in the common library subsystem are changed.

Specifically, the **searchParams: URLSearchParams** attribute is deprecated, and the **params: URLParams** attribute is added.

You need to adapt your application.

 **Change Impacts**

JS APIs in API version 9 are affected. Your application needs to adapt these APIs so that it can properly implement features in the SDK environment of the new version.

**Key API/Component Changes**

| Module                   | Class               | Method/Attribute/Enum/Constant                                         | Change Type|
| :------------------------ | ------------------- | ------------------------------------------------------------ | -------- |
| @ohos.url        | URL         |  searchParams: URLSearchParams; |Deprecated (in API version 9)<br>   |
| @ohos.url        | URL         |  params: URLParams; | Added    |

**Adaptation Guide**

The following illustrates how to create a **URLParams** object in your application.

Example:

```ts
import url from '@ohos.url'
let that = new Url.URL('http://username:password@host:8080/directory/file?Hello=china#qwer=da')
let params = that.URLParams
var result = params.toString()
console.log(result) //%E4%BD%A0%E5%A5%BD=china
```