Use of native ajax variable parameter post (code example)

The content of this article is to introduce the use of native ajax variable parameter post (code example). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

var Ajax = {
post:function(){
xmlhttp = new XMLHttpRequest();var len = arguments.length;var url = arguments[0];
callback = arguments[len-1];var str = '';
xmlhttp.open('POST', url, true);
xmlhttp.onreadystatechange=function()
{if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
callback(xmlhttp.responseText);
}
}if (len = 3) {
data = arguments[1]for(i in data){
str += i + "=" + data[i] +"&"}
str = str.replace(/&$/gi,'')
}if (len = 4) {
headers = arguments[2]for(i in headers){
xmlhttp.setRequestHeader(i,headers[i])
}
}
xmlhttp.send(str);
}
}

Basic syntax of variable parameter post:

Ajax.post(url,{},header,function(){
})

The first parameter is the url, the second is the data parameter, the third parameter is the header, and the fourth is the return function

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