性能测试工具开发的案例分享

　　第二步：代码实现
<script type="text/javascript">
function get_browser() {
var N = navigator.appName， ua =navigator.userAgent， tem;
var M =ua.match(/(opera|chrome|safari|firefox|msie)/?s*(.?d+(.d+)*)/i);
if (M && (TEM = ua.match(/version/([.d]+)/i)) != null) M[2] =tem[1];
M = M ? [M[1]， M[2]] : [N， navigator.appVersion， '-?'];
return M[0];
}
function get_browser_version() {
var N = navigator.appName， ua = navigator.userAgent， tem;
var M = ua.match(/(opera|chrome|safari|firefox|msie)/?s*(.?d+(.d+)*)/i);
if (M && (tem = ua.match(/version/([.d]+)/i)) != null) M[2] =tem[1];
M = M ? [M[1]， M[2]] : [N， navigator.appVersion， '-?'];
return M[1];
}
var browser = get_browser();
var browser_version = get_browser_version();
var br_detect = 0; //default to run
if (browser == 'MSIE') {
if (parseInt(browser_version) < 9) {
var br_detect = 1; //not runthe status js
}
} //end if browser
//setJS controller variable for speed monitor plugin
varBoomRunMark = 0; //0 = enable ，  1=disable
varBoomKickStartMark = 5; // run the collect plugin when random num < 5
varRandomNumber = Math.floor((Math.random() * 10) + 1);
if(br_detect == 0) {
imgLoadBeginTime= new Date();
}
//console.log('randomnumber :'+ RandomNumber);
if (br_detect == 0) {
if (BoomRunMark == 0){
if(RandomNumber  < BoomKickStartMark ){
BOOMR.init({
beacon_url:"http://perf.che168.com/pv_perf.php"，
BW:{ enabled: false }，
RT:{
cookie:'CHE168-RT'
}
});
}//endRandomNumber check
}// end BoomRunMark check
}//end if br_detect
</script>