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          June 23, 2020 04:21 
        
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    Smallest possible Ajax implementation (120 characters)
  
        
  
    
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  | function a(u,c){var x=new XMLHttpRequest;x.open('GET',u);x.onreadystatechange=function(){3<x.readyState&&c(x)};x.send()} | 
Using commas instead of semicolons means you can get away without the {}, so you could shave off a couple more characters :p
  
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The
cstands for “callback”, so you pass in a function to get run (and passed theXMLHttpRequestobject) when the request returns.