PHP Ajax Learning_PHP Tutorial

I am watching ajax recently It needs to be a relatively basic thing, novices can read it

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if(window.ActiveXObject) //If window declares a function { function XMLHttpRequest() //This function firefox has no declaration { try{ //Return object handle return new ActiveXObject("MSXML2.XMLHTTP"); return new ActiveXObject("Microsoft.XMLHTTP"); } catch (err){ alert("XMLHttpRequest error"); } } } //Declare an ajax function. This is the ajax entry function ajax(reqtype,url,asynch,respHandle) { $ajax=new XMLHttpRequest(); //new an xmlhttp. Pay attention to this function. Do you need to add var before it to represent global variables? if($ajax) //Check whether new is successful { //Check what type of submission if(reqtype.toLowerCase()!='post'){ initReq(reqtype,url,asynch,respHandle); //Call an initialization function } else { var args=arguments[4]; //If it is a post, there should be another parameter if(args!=null&&args.length>0) { initReq(reqtype,url,asynch,respHandle,args); //Call an initialization function } } }else { alert('ajax new error'); } } function initReq(reqType,url,bool,respHandle){ try{ $ajax.onreadystatechange=respHandle; //Set the function to be called if the submission is successful. Note that this is a variable $ajax.open(reqType,url,bool); //Open address if(reqType.toLowerCase()=="post"){ //If it is a post, also send the type $ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=UTF-8");

http://www.bkjia.com/PHPjc/631924.html www.bkjia.com true http: //www.bkjia.com/PHPjc/631924.html TechArticle I am looking at ajax recently. It needs to be a relatively basic thing. Newbies can take a look! DOCTYPE HTML PUBLIC -//W3C //DTD HTML 4.0 Transitional//EN HTML HEAD TITLE New Document /TITLE META NAME=Genera...