This time I bring you the study notes of ajax. What are the precautions when 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 onreadystatechange event will 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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