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This article mainly introduces "how to use the hasOwnProperty function in js". In the daily operation, I believe that many people have doubts about how to use the hasOwnProperty function in js. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to use the hasOwnProperty function in js". Next, please follow the editor to study!

1. HasownProperty is the only function in JavaScript that handles attributes, but does not look for prototype chains.

2. Only hasownProperty can give correct and expected results, which is very useful in traversing the properties of an object. There is no other way to exclude attributes on the prototype chain rather than defining the properties of the object itself.

Example

/ / modify Object.prototypeObject.prototype.bar = 1: goo' foo = {goo: undefined}; foo.bar; / / 1 destroy bar' in foo; / / truefoo.hasOwnProperty ('bar'); / / falsefoo.hasOwnProperty (' goo'); / / true at this point, the study on "how to use the hasOwnProperty function in js" is over, hoping to solve everyone's doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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