ajax study notes

This time I bring you the study notes of ajax. What are theprecautionswhen using ajax? Here are practical cases, let’s take a look.

XMLHttpRequest prototypeObject：

##let xhr = new XMLHttpRequest(); //new an XMLHttpRequestInstance of constructor: xhr, open, send, status, onreadystatechangeInheritanceSince XMLHttpRequest;

Whenever readyState changes, the onreadystatechangeeventwill be triggered.

xhr request:

xhr.open('GET','http ://118.25.16.102:3000/user/hive_post_cascader',true); //

readyState:1, the server connection has been established;

xhr.send(); //readyState: 4

,The request has been completed and the response is ready

I believe you have mastered the method after reading the case in this article. Please come for more exciting information. Follow php Chinese website

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