ajax的两种方式

get:

var ajax=new XMLHttpRequest();
ajax.open('get','__URL__/check_all?val='+check);
ajax.send();
ajax.onreadystatechange=function(){
   if(ajax.readyState==4&&ajax.status==200）{
     ajax.responseText;
    }
}

post:
 

var ajax=new XMLHttpRequest();
ajax.open('get','__URL__/check_all?val='+check);
ajax.setRequestHeader('content-type','application/x-www-form-urlencoded')
ajax.send();
ajax.onreadystatechange=function(){
   if(ajax.readyState==4&&ajax.status==200）{
     ajax.responseText;
    }
}