var run=false;var timer;var startButton;var endButton;var img;$(document).ready(function(){startButton=$('#startButton');endButton=$('#endButton');img=$('#alexaimg')});function refresh(){if(run){var a=$('#url').val();var b=$('#frame');b.attr('src',a);var c=$('#times');c.val(parseInt(c.val())+1)}}function start(){run=true;try{startButton.hide();endButton.show();var a=parseInt($('#frequency').val());refresh();timer=setInterval("refresh()",a*1000);img.attr('src','http://traffic.alexa.com/graph?w=900&h=300&r=12m&y=t&u='+$('#url').val())}catch(Exception){startButton.show();endButton.hide();alert("设置错误")}}function end(){run=false;clearInterval(timer);startButton.show();endButton.hide()}