Substr method of JS operation string

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 are 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; The  declares a variable.      var s = "The rain in Spain falls mainly in the plain.";       ss =   s.substr (  12 ,   5)  ; The  gets a substring.                    return (SS);  returns  "Spain" . }