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来源：https://code.google.com/p/miniajax/

非常棒的一个迷你ajax库！

HOW TO USE:

ajax.x - The XMLHttpRequest object (or MS equivalent) used for communication

ajax.serialize(f) f = the form element you wish to be serialized This function serializes all the fields in a form so that they can be passed as a query string in the form 'arg1=val1&arg2=val2'.

ajax.get(url, func) url = the url to query (can contain arguments after a '?') func = the function to call once the response is returned This function uses a GET request to query the specified url and return a response to the specified function.

ajax.gets(url) url = the url to query (can contain arguments after a '?') This function uses a GET request to query the specified url and return a response synchronously. Use this sparingly, as synchronous calls can lock up the browser.

ajax.post(url, func, args) url = the url to query func = the function to call once the response is returned args = a string containing arguments to be passed to the url This function uses a POST request to query the specified url and return a response to the specified function.

ajax.update(url, elm) url = the url to query elm = the (name of the) element to update This function uses a GET request to query the specified url and insert the result into the specified element.

ajax.submit(url, elm, frm) url = the url to query elm = the (name of the) element to update frm = the form element to submit This function is typically used in the onsubmit handler of a function. The form is not submitted the usual way; the form is instead serialized using 'ajax.serialize' and submitted using 'ajax.post'. The result is then inserted into the specified element.

SOURCE CODE:

function $(e){if(typeof e=='string')e=document.getElementById(e);return e}; function collect(a,f){var n=[];for(var i=0;i<a.length;i++){var v=f(a[i]);if(v!=null)n.push(v)}return n};

ajax={}; 
ajax.x=function(){try{return new ActiveXObject('Msxml2.XMLHTTP')}catch(e){try{return new ActiveXObject('Microsoft.XMLHTTP')}catch(e){return new XMLHttpRequest()}}}; 
ajax.serialize=function(f){var g=function(n){return f.getElementsByTagName(n)};var nv=function(e){if(e.name)return encodeURIComponent(e.name)+'='+encodeURIComponent(e.value);else return ''};var i=collect(g('input'),function(i){if((i.type!='radio'&&i.type!='checkbox')||i.checked)return nv(i)});var s=collect(g('select'),nv);var t=collect(g('textarea'),nv);return i.concat(s).concat(t).join('&');}; 
ajax.send=function(u,f,m,a){var x=ajax.x();x.open(m,u,true);x.onreadystatechange=function(){if(x.readyState==4)f(x.responseText)};if(m=='POST')x.setRequestHeader('Content-type','application/x-www-form-urlencoded');x.send(a)}; 
ajax.get=function(url,func){ajax.send(url,func,'GET')}; 
ajax.gets=function(url){var x=ajax.x();x.open('GET',url,false);x.send(null);return x.responseText}; 
ajax.post=function(url,func,args){ajax.send(url,func,'POST',args)}; 
ajax.update=function(url,elm){var e=$(elm);var f=function(r){e.innerHTML=r};ajax.get(url,f)}; 
ajax.submit=function(url,elm,frm){var e=$(elm);var f=function(r){e.innerHTML=r};ajax.post(url,f,ajax.serialize(frm))};

来源：悠游悠游，原文地址：https://yymmss.com/p/miniajax-lib.html