var testFun = function( callback,lblstr ){

//callback 是你的方法 lblstr做标记的名称，测试字符串在函数内部。如有错误，自行改正。。切勿打脸（测试代码来源网上）

 var teststr = '3345687687876789123';

        var tipElem = document.createElement( 'div' ),

        startTime,

        duration = 0;

        for( var j = 5; j > 0; j-- ){

            startTime = +new Date();

            for( var i = 10000; i > 0; i-- ){

                callback(teststr);

            }

            duration = ((+new Date()) - startTime) + duration;

        }

        duration = (duration / 5).toFixed(0);

        tipElem.innerHTML = lblstr + '总耗时：' + duration + ' ms';

        document.body.appendChild( tipElem );

    };