PHP Basics Review 2018-06-17

(1) AJAX

Asynchronous JavaScript and XML (asynchronous JavaScript and XML)

(2) Create a XMLHttpRequest object

Different browsers use different methods to create XMLHttpRequest objects.

Internet Explorer uses ActiveXObject.

Other browsers use JavaScript built-in objects named XMLHttpRequest.

functionGetxmlhttpobject () {varxmlhttp=NULL;Try { //Firefox, Opera 8.0+, Safarixmlhttp=NewXMLHttpRequest ();}Catch(e) {//Internet Explorer Try{xmlHttp=NewActiveXObject ("Msxml2.xmlhttp"); } Catch(e) {xmlHttp=NewActiveXObject ("Microsoft.XMLHTTP"); } }returnxmlHttp;}

PHP Basics Review 2018-06-17