setInterval代码的优化建议，该代码显示每秒出生的小狗、小猫等数量

Optimization suggestions for setInterval code that display how many puppies, kittens, etc. are born every second

本文关键字：代码 出生 优化 setInterval 显示      更新时间：2023-11-26

我正在进行一个项目，该项目将以许多"逐秒"计时器为特色，这些计时器将显示每秒有多少动物出生：）对于如何最好地优化该脚本以获得性能和DRY ish，你有什么建议吗？

JSFiddle在这里-http://jsfiddle.net/gJy4x/32/

var start = new Date(),
midnight = new Date(start.getFullYear(), start.getMonth(), start.getDate(), 0),
first = new Date(start.getFullYear(), start.getMonth(), 1);
setInterval(function () {
    var now = new Date(),
        secondsFromStart = Math.floor((now - start)/1000),
        secondsFromMidnight = Math.floor((now - midnight)/1000),
        secondsFromFirst = Math.floor((now - first)/1000),
        puppiesBornPerSec = 3.16,
        puppiesStart = Math.round(secondsFromStart*puppiesBornPerSec*100) / 100,
        puppiesMidnight = Math.round(secondsFromMidnight*puppiesBornPerSec*100) / 100,
        puppiesFirst = Math.round(secondsFromFirst*puppiesBornPerSec*100) / 100;
    // 3 puppies born every second
    $('#badge01').text(puppiesStart.toFixed(2));
    $('#s01 .morning').text(puppiesMidnight.toFixed(2));
    $('#s01 .month').text(puppiesFirst.toFixed(2));
    // 5 kittens born every second 
    $('#badge02').text(Math.floor(secondsFromStart*5));
    $('#s02 .morning').text(Math.floor(secondsFromMidnight*5));
    $('#s02 .month').text(Math.floor(secondsFromFirst*5));
    // 7 rats born every second
    $('#badge03').text(Math.floor(secondsFromStart*7));
    $('#s03 .morning').text(Math.floor(secondsFromMidnight*7));
    $('#s03 .month').text(Math.floor(secondsFromFirst*7));
}, 1000);

包含省略整数小数的数据的解决方案如下所示
在这种情况下，你需要添加一个类"s"和数据量

<section class="s" data-quantity="3.16" id="s01">
    <h1>if 3.16 puppies are born every second</h1>
    <b id="badge01" class="now">0</b> puppies have been born so far.<br>
    <b class="morning">?</b> puppies have been born today<br>
    <b class="month">?</b> puppies have been born since the first of this month.
</section>
<hr>
<section class="s" data-quantity="5" id="s02">
    <h1>if 5 kittens are born every second</h1>
    <b id="badge02" class="now">0</b> kittens have been born so far.<br>
    <b class="morning">?</b> kittens have been born today<br>
    <b class="month">?</b> kittens have been born since the first of this month.
</section>
<hr>
<section class="s" data-quantity="7" id="s03">
    <h1>if 7 rats are born every second</h1>
    <b id="badge03" class="now">0</b> rats have been born so far.<br>
    <b class="morning">?</b> rats have been born today<br>
    <b class="month">?</b> rats have been born since the first of this month.
</section>

JS-

var start = new Date(),
midnight = new Date(start.getFullYear(), start.getMonth(), start.getDate(), 0),
first = new Date(start.getFullYear(), start.getMonth(), 1);
//create now Date outside Interval
var now = new Date(),
secondsFromStart = Math.floor((now - start)/1000),
secondsFromMidnight = Math.floor((now - midnight)/1000),
secondsFromFirst = Math.floor((now - first)/1000);
//create each $(".s").data with the values
$(".s").each(function(){
    var BornPerSec = $(this).data("quantity"),
    Start = secondsFromStart*BornPerSec,
    Midnight = secondsFromMidnight*BornPerSec,
    First = secondsFromFirst*BornPerSec;
    $(this).data("persec",{"BornPerSec":BornPerSec,"Start":Start,"Midnight":Midnight,"First":First});    
});
setInterval(function () {
    //increment each $(".s").data values and set .text
    $(".s").each(function(){
        var persec=$(this).data("persec");
        persec.Start+=persec.BornPerSec;
        persec.Midnight+=persec.BornPerSec;
        persec.First+=persec.BornPerSec;
        $(this).children('.now').text(persec.Start % 1 === 0 ?persec.Start: persec.Start.toFixed(2));
        $(this).children('.morning').text(persec.Midnight % 1 === 0 ?persec.Midnight:persec.Midnight.toFixed(2));
        $(this).children('.month').text(persec.First % 1 === 0 ?persec.First:persec.First.toFixed(2));
    });
}, 1000);

http://jsfiddle.net/gJy4x/34/

除了Abraham的脚本之外，为了实现最佳优化，循环中的所有内容都应该尽可能缓存。如$(".s")、.children('.now')多次执行

//cache them
var elems = [];
$(".s").each(function(){
   var $this = $(this);
   elems.push({
      obj: $this,
      data: $this.data('persec'),
      now: $this.children('.now'),
      morning: $this.children('.morning'),
      month: $this.children('.month'),
   });
});
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