Symbol.prototype.toString()

概述

toString() 方法返回当前 symbol 对象的字符串表示。

语法

symbol.toString();

描述

Object.prototype.toString()。

symbol 原始值不能转换为字符串

symbol 原始值不能转换为字符串，所以只能先转换成它的包装对象，再调用 toString() 方法：

Symbol("foo") + "bar";      
// TypeError: Can't convert symbol to string
Symbol("foo").toString() + "bar"
// "Symbol(foo)bar"，就相当于下面的:
Object(Symbol("foo")).toString() + "bar"
// "Symbol(foo)bar"

示例

Symbol("desc").toString();   // "Symbol(desc)"

// well-known symbols
Symbol.iterator.toString();  // "Symbol(Symbol.iterator)

// global symbols
Symbol.for("foo").toString() // "Symbol(foo)"

规范

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
Symbol.prototype.toString		 Standard Initial definition.

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!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) 33.0 (33.0) 未实现 未实现 未实现
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) 33.0 (33.0) 未实现 未实现 未实现

相关链接

  1. JavaScript 标准库
  2. Symbol
  3. 属性
    1. Symbol.hasInstance
    2. Symbol.isConcatSpreadable
    3. Symbol.iterator
    4. Symbol.match
    5. Symbol.prototype
    6. Symbol.prototype.description
    7. Symbol.replace
    8. Symbol.search
    9. Symbol.species
    10. Symbol.split
    11. Symbol.toPrimitive
    12. Symbol.toStringTag
    13. 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. 属性
    1. Function.arguments
    2. Function.arity
    3. Function.caller
    4. Function.displayName
    5. Function.length
    6. Function.prototype
    7. Function.name
  8. 方法
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.isGenerator()
    5. Function.prototype.toSource()
    6. Function.prototype.toString()
  9. Object
  10. 属性
    1. Object.prototype.__count__
    2. Object.prototype.__noSuchMethod__
    3. Object.prototype.__parent__
    4. Object.prototype.__proto__
    5. 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.unwatch()
    12. Object.prototype.valueOf()
    13. Object.prototype.watch()
    14. Object.setPrototypeOf()