JavaScript determines whether an array contains a specified element

Source: Internet
Author: User

The example in this article describes how JavaScript determines whether an array contains a specified element. Share to everyone for your reference. Specifically as follows:

This code defines the array method through prototype so that the Contains method can be invoked in any array

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1 2 3 4 5 6 7 8 9 10 11-12 /** * Array.prototype. [Method name] allows-define/overwrite an objects-needle is the item/are searching for * This is a spec Ial variable that refers to ' this ' instance an Array. * Returns True if Needle is in the array, and false otherwise/Array.prototype.contains = function (needle) {for (i) n this) {if (this[i] = needle) return true; }

Usage:

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1 2 3 4 5 Now, can do things like:var x = Array (); if (X.contains (' foo ')) {//Do something special}

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