JavaScript,数组,包含,元素本文实例讲述了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}希望本文所述对大家的javascript程序设计有所帮助。
JavaScript,数组,包含,元素
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