The use of Substring,substr,split in jquery

First, substring method

Returns a substring at the specified position in a string object.

Strvariable.substring (start, end)

"String Literal". Substring (start, end)

Parameters

Start------Indicates the starting position of the substring starting at 0.

The end------indicates where the substring ends, starting at 0.

Description: The method will return a string containing a substring from start to last (not including end).

The substring method uses the smaller values from start and end as the starting point for the substring.

For example, strvar.substring (0, 3) and strvar.substring (3, 0) will return the same substring.

If start or end is NaN or negative, replace it with 0.

The length of the substring equals the absolute value of the difference between start and end.

For example, the length of the substring returned in strvar.substring (0, 3) and strvar.substring (3, 0) is 3.

Example

The following example demonstrates the use of the substring method.

function Substringdemo () {

var SS; Declares a variable.

var s = "The rain in Spain falls mainly in the plain.";

SS = S.substring (12, 17); Takes a substring.

return (SS); return substring "Spain"

}

Second, substr method

Returns a substring of the specified length starting at the specified position.

Stringvar.substr (start [, length])

Parameters

Stringvar-----Required option. The string literal or string object to extract the substring from.

Start-----required option. The starting position of the desired substring. The index of the first character in the string is 0.

Length------options available. The number of characters that should be included in the returned substring.

Description

If length is 0 or negative, an empty string is returned. If this argument is not specified, the substring continues to the end of the stringvar.

Example

The following example demonstrates the use of the Substr method.

function Substrdemo () {

var s, SS; Declares a variable.

var s = "The rain in Spain falls mainly in the plain.";

SS = S.substr (12, 5); Gets a substring.

return (SS); Returns "Spain".

}

Third, split method

Splits a string into substrings and returns the result as an array of strings.

Stringobj.split ([separator[, limit]])

Parameters

stringobj------Required option. The String object or text to be decomposed. The object is not modified by the split method.

Separator-------options available. A string or regular expression object that identifies whether one or more characters are used when separating the string. If this option is omitted, a single element array containing the entire string is returned.

Limit------options. This value is used to limit the number of elements in the returned array.

Description

The result of the split method is an array of strings, which are decomposed in the stingobj where each occurrence of the separator occurs. Separator is not returned as part of any array element.

Example

The following example demonstrates the use of the split method.

function Splitdemo () {

var s, SS;

var s = "The rain in Spain falls mainly in the plain.";

Decompose at each space character.

SS = S.split ("");

return (ss);//returns ["The", "Rain", "in", "Spain", "Falls", "mainly", "in", "the", "plain.")

}

The use of Substring,substr,split in jquery