Three ways to determine whether an object is empty in JS

Source: Internet
Author: User

This article is mainly to determine whether the object is empty in JS three kinds of implementation methods for the detailed analysis of the introduction, the need for friends can come to the reference, I hope to help you

When you write a JS script, you often encounter objects that are empty or are not objects, in this case we can use if to judge it, and then to carry out the corresponding processing methods, the specific determination of their methods are as follows: 1, if (typeOf (x) = = "undefined") 2, if   (TypeOf (x)!= "Object") 3, if (!x) The third is the simplest method, but the third one cannot be judged by a mutually exclusive method of if (x), only in front of the object! Java inside! X must be False when X is true, but this is not possible.
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