function login(){
	
	 $.ajax({
		 url: login_url,
		 type: 'POST',
		 dataType: 'json',
	     data:'username='+$('#username').val()+'&password='+$('#password').val(),
	     error: function(){
	       alert('错误,请重试！');
	     },
	 	success: function(data){
	 	   
	 		if(data.state == true){
	 			window.location = data.result;
	 		}else{
	 			alert(data.result);
	 		}
		}
		
	});		
	return false;
	
}