How to interact between the front and back ends of the Web

How Web front-end and back-end interact

Use AJAX to perform asynchronous data requests. AJAX refers to a method for creating interactive and fast dynamic web applications. Web development technology that can update parts of web pages without reloading the entire web page.

Code example

if (window.XMLHttpRequest) {
	//  IE7+, Firefox, Chrome, Opera, Safari 浏览器执行代码
	xmlhttp = new XMLHttpRequest();
} else {
	// IE6, IE5 浏览器执行代码
	xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}

xmlhttp.onreadystatechange = function(){
	if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
	{
		alert(xmlhttp.responseText);
	}
}
xmlhttp.open("GET", "./get_user.php", true);
xmlhttp.send();

jQuery example

$.ajax({
	type: 'POST'
	url: './get_user.php',
	data: {uid: 123},
	dataType: 'json',
	success: function(result){
        console.log(result);
	}
});

Recommended tutorial: "JS Tutorial》

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