Ajax validates user name instance code _ajax related

Use Ajax to verify that the username code looks like this:

Interface:

get guestbook/index.php
m:index
a:verifyusername
Username: User name to authenticate

Return

{Code
: returned information 0 = no error, 1 = error message: Returned information
specific return information

Js

Ousername1.onblur = function () {//Lost focus, give the current username to the backend to verify
Ajax (' Get ', ' guestbook/index.php ', ' m=index&a= Verifyusername&username= ' + this.value, function (data) {
//alert (data); browser debug View
var d = json.parse (data) ; Parse
overifyusernamemsg.innerhtml = d.message///Send return information to the page
if (d.code) {//code: returned information code 0 = no error, 1 = Error 
  overifyusernamemsg.style.color = ' red '; The error message is red
} else {
OVerifyUserNameMsg.style.color = ' green ';

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