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📜  TypeScript-字符串

📅  最后修改于: 2020-10-19 03:52:44             🧑  作者: Mango

String对象使您可以处理一系列字符。它使用许多辅助方法包装字符串原始数据类型。

句法

var var_name = new String(string);

下面给出了String对象中可用方法的列表及其说明-

S.No. Property & Description
1. Constructor

Returns a reference to the String function that created the object.
2. Length

Returns the length of the string.
3. Prototype

The prototype property allows you to add properties and methods to an object.

字符串方法

下面给出了String对象中可用方法的列表及其说明-

S.No. Method & Description
1. charAt()

Returns the character at the specified index.
2. charCodeAt()

Returns a number indicating the Unicode value of the character at the given index.
3. concat()

Combines the text of two strings and returns a new string.
4. indexOf()

Returns the index within the calling String object of the first occurrence of the specified value, or -1 if not found.
5. lastIndexOf()

Returns the index within the calling String object of the last occurrence of the specified value, or -1 if not found.
6. localeCompare()

Returns a number indicating whether a reference string comes before or after or is the same as the given string in sort order.
7.

match()

Used to match a regular expression against a string.
8. replace()

Used to find a match between a regular expression and a string, and to replace the matched substring with a new substring.
9. search()

Executes the search for a match between a regular expression and a specified string.
10. slice()

Extracts a section of a string and returns a new string.
11. split()

Splits a String object into an array of strings by separating the string into substrings.
12. substr()

Returns the characters in a string beginning at the specified location through the specified number of characters.
13. substring()

Returns the characters in a string between two indexes into the string.
14. toLocaleLowerCase()

The characters within a string are converted to lower case while respecting the current locale.
15. toLocaleUpperCase()

The characters within a string are converted to upper case while respecting the current locale.
16. toLowerCase()

Returns the calling string value converted to lower case.
17. toString()

Returns a string representing the specified object.
18. toUpperCase()

Returns the calling string value converted to uppercase.
19. valueOf()

Returns the primitive value of the specified object.