The difference between json object and json string while post with ajax:

var login = function(){

	var user = $("input[name=username]").val();

	var password = $("input[name=password]").val();

	

	var data = {

		username:user,

		password:password

	};

	data = JSON.stringify(data);

	console.log(data);

	$.post(url_login, data, function(ele, status){

		console.log(ele);

		console.log(status);

	});

}

Attention the command:

"data = JSON.stringify(data)"

It will post the data as normal request values if you didn't change data into a string in the function post. Otherwise as input stream.