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• 句法
• 描述
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

静态 String.raw() method is a tag function of template literals . This is similar 到 r prefix in Python, or the @ prefix in C# for string literals. (But it is not identical ; see explanations in this issue .) It's used to get the raw string form of template strings, that is, substitutions (e.g. ${foo} ) are processed, but escapes (e.g. \n ) are not.

句法

String.raw(callSite, ...substitutions)
String.raw`templateString`

					

参数

callSite

Well-formed template call site object, like { raw: ['foo', 'bar', 'baz'] } .

...substitutions

Contains substitution values.

templateString

A template string , optionally with substitutions ( ${...} ).

返回值

The raw string form of a given template string.

异常

TypeError

TypeError is thrown if the first argument is not a well-formed object.

描述

In most cases, String.raw() is used with template strings. The first syntax mentioned above is only rarely used, because the JavaScript engine will call this with proper arguments for you, (just like with other tag functions ).

String.raw() is the only built-in tag function of template strings. It works just like the default template function and performs concatenation. You can even re-implement it with normal JavaScript code.

范例

Using String.raw()

String.raw`Hi\n${2+3}!`;
// 'Hi\n5!', the character after 'Hi'
// is not a newline character,
// '\' and 'n' are two characters.
String.raw`Hi\u000A!`;
// 'Hi\u000A!', same here, this time we will get the
//  \, u, 0, 0, 0, A, 6 characters.
// All kinds of escape characters will be ineffective
// and backslashes will be present in the output string.
// You can confirm this by checking the .length property
// of the string.
let name = 'Bob';
String.raw`Hi\n${name}!`;
// 'Hi\nBob!', substitutions are processed.
// Normally you would not call String.raw() as a function,
// but to simulate `foo${2 + 3}bar${'Java' + 'Script'}baz` you can do:
String.raw({
  raw: ['foo', 'bar', 'baz']
}, 2 + 3, 'Java' + 'Script'); // 'foo5barJavaScriptbaz'
// Notice the first argument is an object with a 'raw' property,
// whose value is an iterable representing the separated strings
// in the template literal.
// The rest of the arguments are the substitutions.
// The first argument’s 'raw' value can be any iterable, even a string!
// For example, 'test' is treated as ['t', 'e', 's', 't'].
// The following is equivalent to
// `t${0}e${1}s${2}t`:
String.raw({ raw: 'test' }, 0, 1, 2); // 't0e1s2t'
					

规范

规范
ECMAScript (ECMA-262) The definition of 'String.raw' in that specification.

浏览器兼容性

The compatibility table in 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
raw	Chrome 41	Edge 12	Firefox 34	IE No	Opera No	Safari 10	WebView Android No	Chrome Android 41	Firefox Android 34	Opera Android No	Safari iOS 10	Samsung Internet Android 4.0	nodejs 4.0.0

图例

完整支持

完整支持

不支持

不支持

另请参阅

• Template strings
• String
• 词法语法

元数据

• 最后修改： Aug 14, 2020

相关话题

1. 标准内置对象
2. String
3. 特性
   1. String 长度
4. 方法
   1. String.fromCharCode()
   2. String.fromCodePoint()
   3. String.prototype.anchor()
   4. String.prototype.big()
   5. String.prototype.blink()
   6. String.prototype.bold()
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   8. String.prototype.charCodeAt()
   9. String.prototype.codePointAt()
   10. String.prototype.concat()
   11. String.prototype.endsWith()
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   13. String.prototype.fontcolor()
   14. String.prototype.fontsize()
   15. String.prototype.includes()
   16. String.prototype.indexOf()
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   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.toSource()
   43. String.prototype.toString()
   44. String.prototype.toUpperCase()
   45. String.prototype.trim()
   46. String.prototype.trimEnd()
   47. String.prototype.trimStart()
   48. String.prototype.valueOf()
   49. String.prototype[@@iterator]()
   50. String.raw()
5. 继承：
6. Function
7. 特性
   1. Function.arguments
   2. Function.caller
   3. Function.displayName
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   5. Function.name
8. 方法
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   2. Function.prototype.bind()
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