JavaScript Array lastIndexOf Method if (!Array.prototype.lastIndexOf) { Array.prototype.lastIndexOf = function(elt /*, from*/) { var len = this.length; var from = Number(arguments[1]); if (isNaN(from)) { from = len - 1; } else { from = (from < 0) ? Math.ceil(fro...
varname=['gfg','cse','geeks','portal']; // lastIndexOf() method is called to // test whether the searching element // is present in given array or not. a=name.lastIndexOf('cat') // Printing result of method document.write(a); 输出: -1 支持的浏览器:JavaScript Array lastIndex...
ThelastIndexOf()method returns the last index (position) of a specified value. ThelastIndexOf()method returns -1 if the value is not found. ThelastIndexOf()starts at a specified index and searches from right to left (from the given postion to the beginning of the array). ...
The lastIndexOf() method does not change the value of the original string.Example Let's take a look at an example of how to use the lastIndexOf() method in JavaScript. For example: var totn_string = 'TechOnTheNet'; console.log(totn_string.lastIndexOf('T')); In this example, we...
JavaScript Array lastIndexOf Method if (!Array.prototype.lastIndexOf) { Array.prototype.lastIndexOf=function(elt /*, from*/) { var len=this.length; var from=Number(arguments[1]); if (isNaN(from)) { from=len - 1; } else { from=(from ...
The indexOf() and lastIndexOf() methods return different index values for the same sub-string as − Original string: JavaScript Sub-string to be searched: a Position value: 20 Method str.lastIndexOf(sub_str) returns: 3 Print Page Previous Next...
if (from in this && this[from] === elt) return from; } return -1; }; } 例子(Example) 请尝试以下示例。 JavaScript Array lastIndexOf Method if (!Array.prototype.lastIndexOf) { Array.prototype.lastIndexOf = function(elt /*, from*/) { var len = ...
TheArray.lastIndexOf()method returns the last index position of a specified value. If the searched value is not found in the array, it will return-1. Example 1: UseArray.lastIndexOf()Method With Required ParametertargetValue arr1=[5,3,6,5,9]arr2=['Eel','Whale','Eel','Dolphin','...
ThelastIndexOf()method returns the index (position) of the last occurrence of a specified value in a string. ThelastIndexOf()method searches the string from the end to the beginning. ThelastIndexOf()method returns the index from the beginning (position 0). ...
In the following program, we are instantiating the StringBuilder with the value Welcome to TutorialsPoint. Using the lastIndexOf() method, we are trying to retrieve the index of the to substring.Open Compiler public class Index { public static void main(String[] args) { // instantiating the ...