// Execution time: 3.007秒 // 测量同步操作耗时 measureExecutionTime(async() => { const startTime = Date.now(); while (Date.now() - startTime < 3000) { // 这是一个空循环,用于模拟耗时3秒的同步操作 } }); // Execution time: 3秒
functionmeasureExecutionTime(callback){conststartTime=performance.now();// 记录开始时间callback();// 执行回调函数constendTime=performance.now();// 记录结束时间returnendTime-startTime;// 计算并返回执行时长}constelapsedTime=measureExecutionTime(()=>{for(leti=0;i<1e6;i++){Math.sqrt(i);// ...
如下是一些常见的代码实现,有助于理解特性实现的差异: // 使用 Performance API 获取耗时constmeasurePerformance=(callback)=>{conststart=performance.now();callback();constend=performance.now();console.log(`Function executed in:${end-start}milliseconds.`);};// 示例调用measurePerformance(()=>{// 你...
performance.mark('end'); performance.measure('MyFunction', 'start', 'end'); const measure = performance.getEntriesByName('MyFunction')[0]; console.log(Execution time: ${measure.duration} milliseconds); 3. Chrome DevTools Chrome 开发者工具中的 Performance 面板可以记录和分析页面加载及脚本执行过程...
conststartTime=performance.now();// 执行一些耗时的操作constendTime=performance.now();constexecutionTime=endTime-startTime;console.log(`代码执行时间:${executionTime}毫秒`);performance.mark('start');// 执行一些操作performance.mark('end');performance.measure('操作耗时','start','end');constmeasureme...
The script is very simple, yet takes a couple dozen milliseconds (about 150ms on my machine) to execute. How did I measure this time? I could've done something like this: varoutput="";// Remember when we startedvarstart=newDate().getTime();for(vari=1; i<=1e6; i++) {output+=...
timer.heavyComputation(); // Logs execution time 上面的代码定义了一个名为的自定义装饰器 measureTime,并将其应用于 Timer 类中的方法。该装饰器测量装饰方法的执行时间。当我们调用该 heavyComputation 方法时,装饰器会记录开始时间,运行计算,记录结束时间,计算经过的时间,并将其记录到控制台。
performance.measure():计算两个时间戳标记之间的时间间隔。 performance.getEntriesByName():获取指定名称的时间戳标记信息。 这些方法可以帮助我们精确测量代码的执行时间和关键事件的发生时间。 示例代码: const startTime = performance.now(); // 执行一些耗时的操作 const endTime = performance.now();const execu...
We measure both the execution time and the power usage on a large number of web applications, the Google maps application and on HTML5 applications. We show that we are able to significantly reduce the execution time, and perhaps equally important on devices with a limitied amount of battery,...
Measure criteria like cross browser compatibility, a framework used for development, development methodology and decide the one that suits your needs. Also, let us know if you have come across other testing frameworks and why they were better for testing your web applications. Happy testing!