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              <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();
});
            
          
!
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