時間計測（試用版)

gistfile1.js

runTime=function(func){
    var before = (new Date()).getTime();
    func();
    return ((new Date()).getTime() - before);
}

function heikin(arr){
    var sum=0;
    var n = arr.length;
    for (var i =0; i < n; i++) sum += arr[i];
    return  sum/n;
}

var median = function(arr){
  var num = ((arr.length/2)|0);
  if((arr.length % 2) == 1){
     return arr[num];
  }else{
     return (arr[num-1]+arr[num])/2;
  }
}

function bunsan(arr,sum){

    var vari=0;
    var n = arr.length;
    for (var i =0; i < n; i++) vari += Math.pow((arr[i] - sum),2);
    return Math.sqrt(vari/n);
}

function timeit(f, n){
    var a = [];
    for (var i = 0; i < n ; i++) a.push(runTime(f,1))
    console.log(a);
    var sum = heikin(a);
    var vari = bunsan(a,sum);
    return {vari:vari,sum:sum};
};

console.log(timeit(function(){
eval("var fun = function(a,b){return a + b;}");
if (fun(1,1) !== 2) alert('whoa!');
},10));