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📜  ES6-字符串

📅  最后修改于: 2020-10-25 10:37:06             🧑  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JavaScript的字符串原始数据类型。

由于JavaScript字符串之间的原语自动转换和字符串对象，你可以调用任何String对象的一个字符串原始的辅助方法。

使用以下语法创建String对象。

var val = new String(string);

字符串参数是一系列已正确编码的字符。串。

字符串属性

以下是String对象的属性及其描述的列表。

Sr.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

这是String对象中可用方法的列表以及它们的描述。

Sr.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 a sorted 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 uppercase while respecting the current locale.
16 toLowerCase()

Returns the calling string value converted to lowercase.
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.