在此页

• 描述
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

只读 description property is a string returning the optional description of Symbol 对象。

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

描述

Symbol objects can be created with an optional description which can be used for debugging but not to access the symbol itself. The Symbol.prototype.description property can be used to read that description. It is different to Symbol.prototype.toString() as it does not contain the enclosing " Symbol() " string. See the examples.

范例

Using description

Symbol('desc').toString();   // "Symbol(desc)"
Symbol('desc').description;  // "desc"
Symbol('').description;      // ""
Symbol().description;        // undefined
// well-known symbols
Symbol.iterator.toString();  // "Symbol(Symbol.iterator)"
Symbol.iterator.description; // "Symbol.iterator"
// global symbols
Symbol.for('foo').toString();  // "Symbol(foo)"
Symbol.for('foo').description; // "foo"
					

规范

规范
ECMAScript (ECMA-262) The definition of 'get Symbol.prototype.description' in that specification.

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
description	Chrome 70	Edge 79	Firefox 63	IE No	Opera 57	Safari 12.1 12.1 部分支持 12 No support for an undefined description.	WebView Android 70	Chrome Android 70	Firefox Android 63	Opera Android 49	Safari iOS 12.2 12.2 部分支持 12 No support for an undefined description.	Samsung Internet Android 10.0	nodejs 11.0.0

图例

完整支持

完整支持

不支持

不支持

见实现注意事项。

另请参阅

• Symbol.prototype.toString()
• Polyfill: https://npmjs.com/symbol.prototype.description

元数据

• 最后修改： May 21, 2020

相关话题

1. 标准内置对象
2. Symbol
3. 特性
   1. Symbol.asyncIterator
   2. Symbol.hasInstance
   3. Symbol.isConcatSpreadable
   4. Symbol.iterator
   5. Symbol.match
   6. Symbol.matchAll
   7. Symbol.prototype.description
   8. Symbol.replace
   9. Symbol.search
   10. Symbol.species
   11. Symbol.split
   12. Symbol.toPrimitive
   13. Symbol.toStringTag
   14. Symbol.unscopables
4. 方法
   1. Symbol.for()
   2. Symbol.keyFor()
   3. Symbol.prototype.toSource()
   4. Symbol.prototype.toString()
   5. Symbol.prototype.valueOf()
   6. Symbol.prototype[@@toPrimitive]
5. 继承：
6. Function
7. 特性
   1. Function.arguments
   2. Function.caller
   3. Function.displayName
   4. Function.length
   5. Function.name
8. 方法
   1. Function.prototype.apply()
   2. Function.prototype.bind()
   3. Function.prototype.call()
   4. Function.prototype.toSource()
   5. Function.prototype.toString()
9. Object
10. 特性
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
11. 方法
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.valueOf()
    12. Object.setPrototypeOf()