Ajax

$('#save').on('click',function(){
		
	//定义http请求
	var request = new XMLHttpRequest();	
	request.open('post','test.php',true);

	//获取数据
	var data={
		username:$('#user').val(),
		password:$('#pass').val()
	}
	data = $.param(data);
		
	//设置响应头
	request.setRequestHeader("Content-type","application/x-www-form-urlencoded");
	
	request.send(data);
	
	//监听
	request.onreadystatechange=function(){
		if(request.readyState===4){ //表示完成
			if (request.status===200) {  //表示请求成功
				//成功之后做的事情
				 console.log('成功',request.responseText);
			} else {  
				//表示失败
				console.log("发生错误：", request.status);
			}
			
		}
	}
		
})