function testPerformance(){ let performance = window.performance let timing = performance.timing console.log('白屏时间',timing.responseEnd - timing.navigationStart) console.log('页面总下载时间.',timing.loadEventEnd - timing.navigationStart) console.log('DNS解析耗时.',timing.domainLookupEnd - timing.domainLookupStart) console.log('TCP链接耗时.',timing.connectEnd - timing.connectStart) console.log('首包请求耗时.',timing.responseEnd - timing.responseStart) console.log('dom解释耗时.',timing.domComplete - timing.domInteractive) console.log('用户可操作时间.',timing.domContentLoadedEventEnd - timing.navigationStart) }