См консоли время изменяется каждый раз, когда я не знает, почемупочему время, необходимое для выполнения того же яваскрипт кода меняется
Я пытаюсь выполнить функцию и получить время, затраченное на него, я использовал консоль .time(), но каждый раз, когда я запускаю его, отображается разное время. Еще одна вещь. Время, затраченное на подчеркивание, - это больше, чем обычно.
function map(){
\t \t
\t \t console.time('mycode');
\t \t
\t \t var arr = [234345345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,5445645,456456,456456,234,467,234234234,456,43535,456,12,3123123123,456,456456,1231235,6456456,234,234456,4,5632452344,65,543452334124436,2345,345346,2345];
\t \t var result = [];
\t \t var constant = 3;
\t \t var length = arr.length; //will avoid calculation of length each time
\t \t for(i=0;i<length;i++){
\t \t \t temp = arr[i] * constant;
\t \t \t result.push(temp);
\t \t }
\t \t
\t \t console.timeEnd('mycode');
\t \t
\t \t console.time('mycode1');
\t \t
\t \t var underscore = _.map([arr], function(num){ return num * 3; });
\t \t
\t \t console.timeEnd('mycode1');
\t }
\t
\t function where(){
\t \t
\t \t console.time("myCode");
\t \t var arr = [{title: "Cymbeline", author: "Shakespeare", year: 1611},
\t \t \t
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1613},
\t \t \t {title: "The Tempest", author: "Shakespeare", year: 1615}
\t \t ];
\t \t var author = 'Shakespeare';
\t \t var year = '1611';
\t \t var result = [];
\t \t var length = arr.length; //will avoid calculation of length each time
\t \t for(i=0;i<length;i++){ //you know that and takes more time than or statement
\t \t \t if(arr[i]['author'] == author && arr[i]['year'] == year){
\t \t \t \t result.push(arr[i]);
\t \t \t }
\t \t }
\t \t console.log(result)
\t \t console.timeEnd("myCode");
\t \t
\t \t console.time("myCode1");
\t \t var underscore = _.filter(arr, {author: "Shakespeare", year: 1611});
\t \t
\t \t console.log(underscore)
\t \t console.timeEnd("myCode1");
\t }
.container{
\t \t width:calc(100% - 200px);
\t \t text-align:center;
\t \t margin:0 auto;
\t \t background:#f4f4f4;
\t }
<script src="http://underscorejs.org/underscore-min.js"></script>
<h1>Evaluating time </h1>
<input type='button' onclick='map()' value='Execute'>
<input type='button' onclick='where()' value='Execute'>
Почему у вас есть ожидание, что оно будет постоянным? Компьютеры не настолько стабильны, время всегда будет меняться хотя бы немного. –
, если он немного покраснел, но иногда он дает 1,565 мс, а иногда и 0,056 мс .. это не так уж мало. –