`decodeURI()` 函数解码一个由`encodeURI` 先前创建的统一资源标识符（URI）或类似的例程。

## 语法

    decodeURI(encodedURI)

### 参数

`encodedURI`
  一个完整的编码过的 URI

### 返回值

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

### Exceptions

Throws an `URIError` ("malformed URI sequence") exception when `encodedURI` contains invalid character sequences.

## 描述

将已编码 URI 中所有能识别的转义序列转换成原字符，但不能解码那些不会被 `encodeURI` 编码的内容（例如 "`#`"）。

## 示例

### 解码一个西里尔字母（Cyrillic）URL

    decodeURI("https://developer.mozilla.org/ru/docs/JavaScript_%D1%88%D0%B5%D0%BB%D0%BB%D1%8B");
    // "https://developer.mozilla.org/ru/docs/JavaScript_шеллы"

### 捕捉异常

    try {
      var a = decodeURI('%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) decodeURI | Standard |
ECMAScript 2015 (6th Edition, ECMA-262) decodeURI | Standard |
ECMAScript Latest Draft (ECMA-262) decodeURI | 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

- `decodeURIComponent`
- `encodeURI`
- `encodeURIComponent`