best way to test if a variable is an array

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How to detect if a variable is an array

When I need to test if variable is an array (for example input argument in a function that could be object or array) I usually use this piece of code

typeof(myVar) === 'object' && myVar.length !== undefined;

Is this the correct way or is there a more efficient way, considering that even if myVar instanceof Array is faster it should be avoided due to iframe problem?

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Array.isArray现在可用于ECMAScript 5，因此您可以将它与polyfill一起用于旧版浏览器：

if(!Array.isArray) {
  Array.isArray = function (vArg) {
    return Object.prototype.toString.call(vArg) === "[object Array]";
  };
}

Array.isArray(myVar);

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在我看来，“iframe问题”可以简单地通过不使用同一个名称来完成，在我看来，这并不难。但是，我从来没有必要断言某件事是否是阵列...

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If you are already using jQuery within your code, you may use jQuery.isArray(). Here is the documentation:

http://api.jquery.com/jQuery.isArray/

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