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表单结构

function mysubmit(){
				var xhr ;

				if (window.XMLHttpRequest)
				{
				    //  IE7+, Firefox, Chrome, Opera, Safari 浏览器执行代码
				    xhr=new XMLHttpRequest();
				}
				else
				{
				    // IE6, IE5 浏览器执行代码
				    xhr=new ActiveXObject("Microsoft.XMLHTTP");
				}
				xhr.open("POST","http://localhost/graduationProject/server/login.php",true);
				xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
				xhr.send("userid=1111&username=1111&password=1111");

		// body...
	}

ajax请求

浏览器报错：index.html:1 Failed to load http://localhost/graduationProject/server/login.php: Redirect from 'http://localhost/graduationProject/server/login.php' to 'http://localhost/graduationProject/browser/flappybirds/index.html' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.