Community Learn Tools Library Leisure
search
English
Home > Web Front-end > JS Tutorial > JavaScript Array object extends indexOf() method_javascript tips

JavaScript Array object extends indexOf() method_javascript tips

WBOY
Release： 2016-05-16 16:49:07
Original
1657 people have browsed it

Background: Among the standard methods of Array objects in JavaScript, there is no indexOf() method, which can be extended through the following code.

Copy code The code is as follows:

if (!Array.prototype.indexOf) {
Array.prototype.indexOf = function(elt) {
var len = this.length >>> 0;
var from = Number(arguments[1]) || 0;
from = (from < 0) ? Math.ceil(from) : Math.floor(from);
if (from < 0) from = len;
for (; from < len; from ) {
if (from in this && this[from] === elt) return from;
}
return - 1;
};
}
Related labels：
indexof
source：php.cn
Previous article：js statistics page visit count implementation code_javascript skills Next article：A JavaScript courtship small special effect_javascript skills
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
Invalid React child element (found: Object with key {clientVersion}). If you want to render a collection of child elements, use an array instead I have a multi-step form and when I try to submit it shows this error. However, if I use c...
From 2024-04-06 16:25:39
0
1
346
vue vee-validate captures the problem of date picker selection The v-model binding on my datepicker field is not working properly. When you make a select...
From 2024-04-06 11:38:56
0
1
510
**Error type: Unable to iterate 'NoneType' object** I want to use ssh tunnel to access Mysql database. Unfortunately, the architecture of this...
From 2024-04-06 10:26:38
0
1
378
Push objects to array, composable API There is a project. There are two selection options "size" (large, small) and qu...
From 2024-04-05 14:41:47
0
1
1526
Display nested array of objects in HTML table by iterating I have the following input containing an array of nested objects. summary is the parent ob...
From 2024-04-05 14:11:42
0
1
1373
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template