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对数组随机排序​两种方式的比较

对数组随机排序两种方式的比较

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function testArr(){

  var tt = new Date().getTime();

  var arr = [];
  for (var i = 1;i<=100;i++){
    arr.push(i);
  }


  var t1 = new Date().getTime();
  console.log('start Time:'+(t1-tt));
  for (var i = 1;i<=1000;i++){
    arr.sort(function(){return Math.random() - 0.5;});
  }
  var t2 = new Date().getTime();
  console.log('sort Time:'+(t2-t1));

  t2 = new Date().getTime();
  for (var i = 1;i<=1000;i++){
    shuffle(arr);
  }
  var t3 = new Date().getTime();
  console.log('shuffle Time:'+(t3-t2));

}

function shuffle(o){
  for(var j, x, i = o.length; i; j = Math.floor(Math.random() * i), x = o[--i], o[i] = o[j], o[j] = x);
  return o;
}

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