String. indexof
String. indexof method (char, int32, int32)The index of the first matching item of the specified character in this instance. Searches start from the specified character location and checks the specified number of character
IndexOf method
Returns the character position of a substring within a string object for the first time.
Strobj.indexof (substring[, StartIndex])
Parameters
Strobj
Required option. A String object or literal.
SubString
Required option. The substring
String. indexof
String. indexof method (char, int32, int32)The index of the first matching item of the specified character in this instance. Searches start from the specified character location and checks the specified number of character locations.
Array does not have the indexOf method, which makes it troublesome to search for the index of an element in an Array. Therefore, Array is extended through prototype. prototype. indexOf (), but there is a problem when traversing the Array. The Array
Use of the indexOf method String type in the JavaScript Array
Let's take a look at the well-known string usage.
let str = 'orange'; str.indexOf('o'); //0 str.indexOf('n'); //3 str.indexOf('c'); //-1
Here 0 and 3 are the positions where o and n
Returns the first occurrence of a substring in a String object.
Public indexOf (value: String, [startIndex: Number]): NumberSearch for the string, and return the position of the first matching item of the value found at or after the startIndex
ArticleDirectory
Syntax
Description
Instance
Reprinted ......
String. indexof method (value, [startindex], [count])
The index of the first matching item of the specified character in this instance. Searches start
Javascript indexofReturns the position of the substring that appears for the first time in the string object.
Javascript indexof format
Strobj. indexof (substring, start)
The strobj parameter is required. String object or text.
Substring is
Array does not have the indexOf method. In this way, it is troublesome to search for the index of an element in an Array. For the convenience of calling, Array is extended through prototype. prototype. indexOf (), which makes it easier to use.
Generally, we can determine whether a value exists in a string. contains, in fact, there are many methods to determine the existence of a value in a string, the most common is the aforementioned string. contains, which are commonly used, are also
Document directory
Indexof
Indexof
Int indexof (int ch, int fromindex) function: it is the first position of the character ch after the string fromindex bit.-1 is not found.Indexof
public int indexOf(int ch)
Returns the index of the
Array does not have the indexOf method. In this way, it is troublesome to search for the index of an element in an Array. For the convenience of calling, Array is extended through prototype. prototype. indexOf (), which makes it easier to use.
Examples of indexOf () and lastIndexOf application methods in Javascript, indexoflastindexof
IndexOf () method
indexOf() Returns the position of the first occurrence of a specified string value.
Note:indexOf() The method is case sensitive!
Note: If
This article mainly introduces the extension of Array for JS. prototype. the problem caused by indexOf and the solution can be found by a friend who needs it. the Array does not have the indexOf method, so it is troublesome to search for the index
This article mainly introduces the extension of Array for JS. prototype. the problem caused by indexOf and the solution can be found by a friend who needs it. The Array does not have the indexOf method, so it is troublesome to search for the index
Detailed analysis of indexof usage in js
This article mainly introduces the use of indexof in js in detail. If you need a friend, please refer to it and hope to help you.
String. IndexOf method (Char, [startIndex], [count])
The index of the first
Problems caused by extension of Array. prototype. indexOf for JS and solutions, jsarrayindexof
Array does not have the indexOf method. In this way, it is troublesome to search for the index of an element in an Array. For the convenience of calling,
Objective
Believe that when it comes to indexOf everyone is not unfamiliar, to determine whether the string contains substrings are particularly common, is not skilled students of the sharp weapon. This article on the recent encounter of a problem,
Locate a substring is to find the substring or character contained in a string. Next, we will introduce it in detail. I. IndexOf/LastIndexOfThe IndexOf method is used to search for the first occurrence of a specific character or substring in a
Homepage? Javascript? Indexof () and lastindexof () search string location published on by admin two methods to find the sub-string from the string: indexof () and lastindexof (). Both methods search for a given string from a string, and then return
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