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This article mainly introduces "how to understand ajax cross-domain problems". In daily operation, I believe many people have doubts about how to understand ajax cross-domain problems. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "how to understand ajax cross-domain problems". Next, please follow the editor to study!

What is the AJAX cross-domain problem

Simply put, when the front end invokes the back-end service interface

Cross-domain problems arise if the service interface is not in the same domain

AJAX cross-domain scenario

The development mode of separation and service of front and rear end

Scenarios in which the front and rear end are developed independently and the front end needs to call a large number of back-end interfaces

Cross-domain problems arise as long as the back-end interface is not in the same domain.

Cross-domain problems are very common, and it is also important to solve them.

Cross-domain reasons for AJAX

Browser restrictions: browser security check restrictions

Cross-domain (any difference in protocol, domain name, port will be considered cross-domain)

XHR (XMLHttpRequest) request

Ideas for solving Cross-domain problems in AJAX

Browser: the browser removes the cross-domain check, which is of little practical value.

XHR: do not use XHR, use JSONP, there are many disadvantages, can not meet the current development requirements

Cross-domain: the callee modifies to support cross-domain calls (specify parameters); the caller modifies hidden cross-domain (based on proxy)

At this point, the study on "how to understand the cross-domain problem of ajax" is over. I hope to be able to solve your 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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