本文實例講述了JavaScript判斷數組是否包含指定元素的方法。分享給大家供大家參考。具體如下：
這段代碼通過prototype定義了數組方法，這樣就可以在任意數組調用contains方法
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1 2 3 4 5 6 7 8 9 10 11 12 /** * Array.prototype.[method name] allows you to define/overwrite an objects method * needle is the item you are searching for * this is a special variable that refers to "this" instance of an Array. * returns true if needle is in the array, and false otherwise */ Array.prototype.contains = function ( needle ) { for (i in this) { if (this[i] == needle) return true; } return false; }用法：
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1 2 3 4 5 // Now you can do things like: var x = Array(); if (x.contains('foo')) { // do something special }希望本文所述對大家的javascript程序設計有所幫助。