`decodeURIComponent()` 方法用于解码由 `encodeURIComponent` 方法或者其它类似方法编码的部分统一资源标识符（URI）。

## 语法

    decodeURIComponent(encodedURI)

### 参数

`encodedURI`
  编码后的部分 URI

### 返回值

A new string representing the decoded version of the given encoded Uniform Resource Identifier (URI) component.

### Exceptions

Throws an `URIError` ("malformed URI sequence") exception when used wrongly.

## 描述

将已编码 URI 中所有能识别的转义序列转换成原字符。

## 示例

### 解码一个西里尔字母的URL

    decodeURIComponent("JavaScript_%D1%88%D0%B5%D0%BB%D0%BB%D1%8B");
    // "JavaScript_шеллы"

### 捕捉异常

    try {
      var a = decodeURIComponent('%E0%A4%A');
    } catch(e) {
      console.error(e);
    }

    // URIError: malformed URI sequence

## 规范

规范 | 状态 | 备注
--- | --- | ---
ECMAScript 3rd Edition (ECMA-262) | Standard | 初始定义
ECMAScript 5.1 (ECMA-262) decodeURIComponent | Standard |
ECMAScript 2015 (6th Edition, ECMA-262) decodeURIComponent | Standard |
ECMAScript Latest Draft (ECMA-262) decodeURIComponent | Draft |

## 浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

- Desktop
- Mobile

特性 | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari
--- | --- | --- | --- | --- | ---
基础功能 | (Yes) | (Yes) | (Yes) | (Yes) | (Yes)

特性 | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile
--- | --- | --- | --- | --- | --- | ---
基础功能 | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes)

## 相关链接

- `decodeURI`
- `encodeURI`
- `encodeURIComponent`