JavaScript lastIndexOf () method
Examples
Find the string "planet" last seen:
var n=str.lastIndexOf("planet");
n output:
try it"
Definition and Usage
lastIndexOf () method returns the position of a specified string value last appeared in a string at a specified location from the search forward.
Note: This method is retrieved from the head to the tail string string Object, to see if it contains a substring searchvalue.Start retrieving location (not specified fromindex time) at the end of the fromindex string or strings. If you find a searchvalue, the first character position in stringObject searchvalue in return. stringObject character position is zero-based.
If no matching string is returned -1.
Note: The lastIndexOf () method is case sensitive!
Tip: You can also refer a similar manner to the indexOf () .
Browser Support
All major browsers support lastIndexOf () method
grammar
Parameter Value
| 参数 | 描述 |
|---|---|
| searchvalue | 必需。规定需检索的字符串值。 |
| start | 可选的整数参数。规定在字符串中开始检索的位置。它的合法取值是 0 到 stringObject.length - 1。如省略该参数，则将从字符串的最后一个字符处开始检索。 |
return value
| 类型 | 描述 |
|---|---|
| Number | 查找的字符串最后出现的位置，如果没有找到匹配字符串则返回 -1。 |
technical details
| JavaScript version: | 1.0 |
|---|
More examples
Examples
From the first 20 characters Find the string "planet" last seen,:
var n=str.lastIndexOf("planet",20);
n output:
try it"