[ Web Proxy ]
URL:
Viewing: https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/String/toString [Back]  [Original]
String.prototype.toString() - JavaScript | MDN
HTML

HTML: Markup language

HTML reference
HTML guides
Markup languages
CSS

CSS: Styling language

CSS reference
CSS guides
Layout cookbook
JavaScriptJS

JavaScript: Scripting language

JS reference
JS guides
Web APIs

Web APIs: Programming interfaces

Web API reference
Web API guides
All

All web technology

Technologies
Topics
Learn

Learn web development

Frontend developer course
Learn HTML
Learn CSS
Learn JavaScript
Tools

Discover our tools

About

Get to know MDN better

Blog
  1. Web
  2. JavaScript
  3. JavaScript
  4. JavaScript
  5. String
  6. String.prototype.toString()
()

MDN Web Docs

View in English Always switch to English

String.prototype.toString()

20157

String toString() 

const stringObj = new String("foo");

console.log(stringObj);
// Expected output: String { "foo" }

console.log(stringObj.toString());
// Expected output: "foo"

js
toString()

String Object toString Object.prototype.toString() String toString String String.prototype.valueOf()

toString() this String this TypeError

String [Symbol.toPrimitive]() String JavaScript toString() String toString()

js
String.prototype.toString = () => "";
console.log(`${"foo"}`); // "foo"
console.log(`${new String("foo")}`); // ""

toString()

String

js
const x = new String("Hello world");

console.log(x.toString()); // "Hello world"

ECMAScript 2027 LanguageSpecification
# sec-string.prototype.tostring

MDN

20251023 MDN

GitHub
  1. JavaScript
  2. String
    1. String()
    1. String.fromCharCode()
    2. String.fromCodePoint()
    3. String.raw()
    1. String.prototype.anchor()
    2. String.prototype.at()
    3. String.prototype.big()
    4. String.prototype.blink()
    5. String.prototype.bold()
    6. String.prototype.charAt()
    7. String.prototype.charCodeAt()
    8. String.prototype.codePointAt()
    9. String.prototype.concat()
    10. String.prototype.endsWith()
    11. String.prototype.fixed()
    12. String.prototype.fontcolor()
    13. String.prototype.fontsize()
    14. String.prototype.includes()
    15. String.prototype.indexOf()
    16. String.prototype.isWellFormed()
    17. String.prototype.italics()
    18. String.prototype.lastIndexOf()
    19. String.prototype.link()
    20. String.prototype.localeCompare()
    21. String.prototype.match()
    22. String.prototype.matchAll()
    23. String.prototype.normalize()
    24. String.prototype.padEnd()
    25. String.prototype.padStart()
    26. String.prototype.repeat()
    27. String.prototype.replace()
    28. String.prototype.replaceAll()
    29. String.prototype.search()
    30. String.prototype.slice()
    31. String.prototype.small()
    32. String.prototype.split()
    33. String.prototype.startsWith()
    34. String.prototype.strike()
    35. String.prototype.sub()
    36. String.prototype.substr()
    37. String.prototype.substring()
    38. String.prototype.sup()
    39. String.prototype.toLocaleLowerCase()
    40. String.prototype.toLocaleUpperCase()
    41. String.prototype.toLowerCase()
    42. String.prototype.toString()
    43. String.prototype.toUpperCase()
    44. String.prototype.toWellFormed()
    45. String.prototype.trim()
    46. String.prototype.trimEnd()
    47. String.prototype.trimStart()
    48. String.prototype.valueOf()
    49. String.prototype[Symbol.iterator]()
    1. Stringlength
  8. Object/Function
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toString()
    5. Function.prototype[Symbol.hasInstance]()
    1. Function.displayName
    2. Functionlength
    3. Function.name
    4. Function.prototype.prototype
    5. Function.prototype.arguments
    6. Function.prototype.caller
    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.toString()
    10. Object.prototype.valueOf()
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
MDN

MDN
Mozilla

mozilla.org 19982026

Web Proxy Viewer  |  New URL  |  Original Page