使用“标准”图片进行监控对比

idc.js

// via http://www.infoq.com/cn/presentations/wh-dianping-web-develop-road

var idcUrl = 'http://domian.com/test.jpg?' + Math.random();

document.getElementById('top').innerHTML = '<img src="'
    + idcUrl + '" onload="idc(this.src, '
    + (new Date().getTime()) + ')" />';

function idc(url, start) {
    var loadTime = new Date().getTime() - start;
    _gaq.push(['_trackEvent', 'IDCLoadTime', url, '', loadTime]);
}