(function(){ let ary = []; ary.length = 10000000; for (let i = 0; i < ary.length; ++i) { ary[i] = false; // null or false } let count = 5, sum = 0; for (let k = 0; k < count; ++k) { let time0 = Date.now(); for (let i = 0; i < ary.length; ++i) { ary[i] = (Math.random() > 0.5); } for (let i = 0; i < ary.length; ++i) { ary[i] = (Math.random() > 0.5); } let time1 = Date.now(); sum += time1 - time0; } alert(sum * 1.0 / count); })();
