cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - ActiveLovehtmlicon-new-collectionicon-personicon-teamlog-outoctocatpop-outspinnerstartv

Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation

     

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

            
              <input type="text" class="date-string" placeholder="要格式化的时间,默认为当前时间戳">
<input type="text" class="format-times" placeholder="格式化函数执行次数,默认50W次">
<input type="text" class="test-times" placeholder="重复测试次数,默认5次">
<div class="submit">执行测试</div>
<div>
  测试过程中的页面可能会长时间未反应,请安心等下平均时间计算完成。或者打开开发者工具观察console输出
</div>
<div>测试结果:
  <div class="testfunc parse">Date.parse(d):
    <div class="result"></div>
    <span class="avg"></span>
  </div>
  <div class="testfunc getTime">d.getTime():
    <div class="result"></div>
    <span class="avg"></span>
  </div>
  <div class="testfunc valueOf">d.valueOf():
    <div class="result"></div>
    <span class="avg"></span>
  </div>
  <div class="testfunc plus">+d:
    <div class="result"></div>
    <span class="avg"></span>
  </div>
  <div class="testfunc number">Number(d):
    <div class="result"></div>
    <span class="avg"></span>
  </div>
</div>
            
          
!
            
                 input {
     width: 200px;
     height: 30px;
     line-height: 30px;
     padding: 0 5px;
     margin: 10px 0;
     outline: none;
   }
   
   .submit {
     width: 150px;
     height: 50px;
     background: #EEE;
     border-radius: 5px;
     line-height: 50px;
     text-align: center;
     margin: 10px 0;
   }
   
   .testfunc {
     border: 1px solid #929C92;
     margin: 10px 0;
     padding: 10px;
   }
   
   .testfunc span {
     display: block;
   }
   
   .avg::before {
     content: '平均耗时为:';
     font-weight: bold;
   }
   
   .avg::after {
     content: 'ms';
     font-weight: bold;
   }
            
          
!
            
                function test(dateString,times,func){
    var startTime=window.performance.now();
    // console.log('start='+startTime.getTime());
    for (var i = 0; i < times; i++) {
        func(dateString);
    };
    var endTime=window.performance.now();
    // console.log('endTime='+endTime.getTime());
    var gapTime=endTime-startTime;
    console.log('一共耗时:'+gapTime+'ms');
    //console.log('时间字符串'+dateString);
    return gapTime;
}

function tParse(dateString){
    var d=new Date(dateString);
    var formatDate=Date.parse(d);
}
function tGetTime(dateString){
    var d=new Date(dateString);
    var formatDate=d.getTime();
}
function tValueOf(dateString){
    var d=new Date(dateString);
    var formatDate=d.valueOf();
}
function tPlus(dateString){
    var d=new Date(dateString);
    var formatDate=+d;
}
function tNumber(dateString){
    var d=new Date(dateString);
    var formatDate=Number(d);
}


function allTest(){
    console.log(resultMatrix);
    times=$('.format-times').val();
    testTimes=$('.test-times').val();
    dateString=$('.date-string').val();
    if(!dateString){
        dateString=Date.now();
    }
    if(!times){
        times=50000;
    }
    if(!testTimes){
        testTimes=5;
    }
    console.log('times='+times+'testTimes='+testTimes);
    var allFunc=[tParse,tGetTime,tValueOf,tPlus,tNumber];
    if(!resultMatrix.length){
        resultMatrix=[];
    }
    for (var i = 0; i < testTimes; i++) {
        for (var j = 0,funcLength=allFunc.length; j < funcLength; j++) {
            var currentResult=$('.result').eq(j);
            var gapTime=test(dateString,times,allFunc[j]);
            var testTime=currentResult.find('span').length+1;
            if(!resultMatrix[testTime-1]){
                resultMatrix[testTime-1]=[];
            }
            console.log('1');
            var result="<span>第"+testTime+'次实验结果:耗时'+gapTime+'ms</span>';
            currentResult.append(result);//append不是一条一条加,而是全部结果出来后才加上去,why?
            // var result=document.createElement('span');
            // result.innerHTML='第'+testTime+'次实验结果:耗时'+gapTime+'ms';
            // currentResult.get(0).appendChild(result);
            resultMatrix[testTime-1][j]=gapTime;
        };
    };
    console.log(resultMatrix);
    for (var i = 0,timeAvg=[]; i <resultMatrix[0].length; i++) {
        // console.log('resultMatrix.length='+resultMatrix.length);
        for (var j = 0,timeAll=0; j < resultMatrix.length; j++) {
        // console.log('resultMatrix['+i+'].length='+resultMatrix[i].length);
        // console.log('resultMatrix['+j+']['+i+']='+resultMatrix[j][i]);
            // timeAll+=resultMatrix[j][i];
            timeAll=resultMatrix[j][i]+timeAll;//i和j下标的先后位置不能弄反。否则会undefined
            console.log('总时间='+timeAll);
        };
        timeAvg[i]=timeAll/resultMatrix.length;
        console.log(timeAvg[i]);
        $('.avg').eq(i).text(timeAvg[i]);
    };
}
var resultMatrix=new Array();
$('.submit').on('click',function(){
    allTest();
});
            
          
!
999px
🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.
Loading ..................

Console