本文实例讲述了JavaScript判断数组是否包含指定元素的方法。分享给大家供大家参考。具体如下：

这段代码通过prototype定义了数组方法，这样就可以在任意数组调用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 }

希望本文所述对大家的javascript程序设计有所帮助。