JS to determine the method of string inclusion

Source: Internet
Author: User
Tags bool integer

The example of this article describes the method of JS judgment string inclusion. Share to everyone for your reference. Specifically as follows:

1. Examples:

1 2 3 4 5 6 7 8 var tempstr = "Temptext"; var bool = Tempstr.indexof ("Texxt"); Returns an integer value greater than or equal to 0, and returns "-1" if it does not contain "Text". if (bool>0) {document.write ("include string");} else{document.write ("Do Not Contain strings");

2. IndexOf Usage:

1 Strobj.indexof (substring[, StartIndex])

The IndexOf function method in JavaScript returns an integer value that indicates the starting position of the substring of a string object. If no substring is found, returns-1. If the startindex is a negative number, the startindex is treated as zero. If it is larger than the maximum character position index, it is considered to be the largest possible index.

Parameters:

Strobj: Required option, String object or text.
SubString: Required, substring to find in string object.
Starindex: Optional, an integer value that indicates the index in which to start the lookup within a String object. If omitted, it is searched from the beginning of the string;

If the startindex is a negative number, the startindex is treated as zero. If it is larger than the maximum character position index, it is considered to be the largest possible index.

3. The difference from the LastIndexOf:

The LastIndexOf () method retrieves the substring starting at the end of the string.

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