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
/** * 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：
// now you can do things like:var x = array();if (x.contains('foo')) { // do something special}