JS to determine whether a string variable contains a Word string implementation method _javascript tips

JS to determine whether a string variable contains a Word string implementation method

varcts = "Bbltext";
if (Cts.indexof ("text") > 0) {
 alert (the ' Cts contains the Text string ');
} 

IndexOf Usage:

Returns the character position for the first occurrence of a substring within a string object.

Strobj.indexof (substring[, StartIndex])

Parameters

Strobj

Required option. A String object or text.

SubString

Required option. The substring to find in the string object.

Starindex

Options available. An integer value that indicates the index in which to start the lookup within a String object. If omitted, it is looked up from the beginning of the string.

Description

The IndexOf method returns an integer value that indicates the starting position of the substring of the 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.

Performs a lookup from left to right. Otherwise, the method is the same as LastIndexOf.

Example

The following example illustrates the use of the IndexOf method.

 function Indexdemo (str2) { 
  var str1 = "Babebibobubabebibobu" 
  var s = str1.indexof (str2); 
  return (s); 
  

For JavaScript indexof ignore case

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.

The IndexOf function performs a lookup from left to right. Otherwise, the method is the same as LastIndexOf.

The following example illustrates the use of the IndexOf function method.

Functionindexdemo (str2) {
  varstr1 = "Babebibobubabebibobu"
  VARs = Str1.indexof (str2);
  return (s);

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