jquery Method Summary for judging whether a string contains a specific character

Method One: Use the indexof () and LastIndexOf () methods

Case:

var Cts = "Bbltext"; if (Cts.indexof ("Text") >= 0) {     

indexof Usage :

Returns the character position of a substring within a string object for the first time. Strobj.indexof (substring[, StartIndex]) parameter strobj required option. A String object or literal. Substring required option. The substring to find in the string object. Starindex options available. The integer value that indicates the index at which to start the lookup within a String object. If omitted, it is searched from the beginning of the string. Description The IndexOf method returns an integer value that indicates the starting position of a substring in a string object. If no substring is found, 1 is returned. If the startindex is negative, then startindex is treated as zero. If it is larger than the maximum character position index, it is treated as the largest possible index. Performs a lookup from left to right. Otherwise, the method is the same as lastIndexOf.

Attention:

The IndexOf () method is case-sensitive! If the string value that you want to retrieve does not appear, the method returns-1. The use of lastIndexOf () is the same as indexof (), except that you want to find it from the right.

Method Two: Use the test () method

Example: In the following example, we will retrieve "W3school":

var str = "Visit w3school"; var patt1 = new RegExp ("W3school"); var result = Patt1.test (str);d ocument.write ("Result:" + res ULT);

Result output: Result:true
Introduction to How to use:

The Define and use test () method is used to detect whether a string matches a pattern. The syntax Regexpobject.test (string) parameter describes a string that is  required. The string to detect. The return value returns True if the string contains text that matches regexpobject, otherwise false. The description invokes the test () method of the RegExp object R and passes the string s to it, which is equivalent to this expression: (R.exec (s)! = null).

Reference website: http://www.w3school.com.cn/jsref/jsref_test_regexp.asp

jquery Method Summary for judging whether a string contains a specific character