What to dig into-Ajax efficient development

Get/post Request

Post send data 2 times, one header, one body, so post will be faster

Xmlhttprequest.getallresponseheaders ()

Xmlhttprequest.responsetext

Xmlhttprequest.setrequestheader

Xmlhttprequest.open ()

Xmlhttprequest.send

Cross-domain requests: dynamic footstep insertion

Multipart XHR: Slicing processing

http://techfoolery.com/mxhr/

Imagestring.split (' \u0001 '),

if (req.readystate===3) {

Window.setinterval (FN, 15)

Req.responseText.substring (lastlength, length)

}

The most lightweight request "semaphore"

var params=["step=2", ' page=3 ']

New Image (). src=url+ '? ' +params.join (' & ')

Image.onload=function () {

if (this.width==1) {success}

if (this.width==2) {failure, try again}

}

Data format: Performance comparisons, pros and cons

Verbose XML, Verbose json, simple JSON, Array JSON, Custom Format (Script insertion)

Simple XML, Verbose json-p, simple json-p, Array json-p, Custom Format (XHR)

Data cache: Cookie, Last Modified Date, Expire, Request Header, Server side configuration

Long Poll:

iframe, Comet,

What to dig into-Ajax efficient development