Questo tutorial presuppone che tu abbia una conoscenza generale delle interfacce a riga di comando e
sviluppo del prodotto.
(Facoltativo) Configurare una chiave API
Se stai solo provando l'API PageSpeed Insights, non hai bisogno di una chiave API. Se
di utilizzare l'API in modo automatico ed eseguire più query al secondo,
serve una chiave API.
La risposta è un oggetto JSON. Per saperne di più, consulta Risposta
su ciascuna delle proprietà dell'oggetto risposta.
{"captchaResult":"CAPTCHA_NOT_NEEDED","kind":"pagespeedonline#result","id":"https://developers.google.com/","loadingExperience":{"id":"https://developers.google.com/","metrics":{"FIRST_CONTENTFUL_PAINT_MS":{"percentile":3482,"distributions":[{"min":0,"max":1000,"proportion":0.37151728768042963},{"min":1000,"max":2500,"proportion":0.4244153519077991},{"min":2500,"proportion":0.2040673604117713}],"category":"SLOW"},"FIRST_INPUT_DELAY_MS":{"percentile":36,"distributions":[{"min":0,"max":50,"proportion":0.960628961482204},{"min":50,"max":250,"proportion":0.02888834714773281},{"min":250,"proportion":0.010482691370063388}],"category":"FAST"}},"overall_category":"SLOW","initial_url":"https://developers.google.com/"},"originLoadingExperience":{"id":"https://developers.google.com","metrics":{"FIRST_CONTENTFUL_PAINT_MS":{"percentile":2761,"distributions":[{"min":0,"max":1000,"proportion":0.4236433226493666},{"min":1000,"max":2500,"proportion":0.45045120795679117},{"min":2500,"proportion":0.1259054693938423}],"category":"SLOW"},"FIRST_INPUT_DELAY_MS":{"percentile":45,"distributions":[{"min":0,"max":50,"proportion":0.9537371485251699},{"min":50,"max":250,"proportion":0.03044972719889055},{"min":250,"proportion":0.01581312427593959}],"category":"FAST"}},"overall_category":"SLOW","initial_url":"https://developers.google.com/"},"lighthouseResult":{"requestedUrl":"https://developers.google.com/","finalUrl":"https://developers.google.com/","lighthouseVersion":"3.2.0","userAgent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/72.0.3584.0 Safari/537.36","fetchTime":"2018-11-01T03:03:58.394Z","environment":{"networkUserAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3559.0 Safari/537.36","hostUserAgent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/72.0.3584.0 Safari/537.36","benchmarkIndex":590.0},"runWarnings":[],"configSettings":{"emulatedFormFactor":"desktop","locale":"en-US","onlyCategories":["performance"]},"audits":{"estimated-input-latency":{"id":"estimated-input-latency","title":"Estimated Input Latency","description":"The score above is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/estimated-input-latency).","score":1.0,"scoreDisplayMode":"numeric","displayValue":"30 ms"},"uses-rel-preconnect":{"id":"uses-rel-preconnect","title":"Preconnect to required origins","description":"Consider adding preconnect or dns-prefetch resource hints to establish early connections to important third-party origins. [Learn more](https://developers.google.com/web/fundamentals/performance/resource-prioritization#preconnect).","score":1.0,"scoreDisplayMode":"numeric","details":{"headings":[],"type":"opportunity","items":[],"overallSavingsMs":0.0}},...},"categories":{"performance":{"id":"performance","title":"Performance","score":0.96,"auditRefs":[{"id":"first-contentful-paint","weight":3.0,"group":"metrics"},{"id":"first-meaningful-paint","weight":1.0,"group":"metrics"},...]}},"categoryGroups":{"a11y-element-names":{"title":"Elements Have Discernible Names","description":"These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader."},"a11y-language":{"title":"Page Specifies Valid Language","description":"These are opportunities to improve the interpretation of your content by users in different locales."},...},"i18n":{"rendererFormattedStrings":{"varianceDisclaimer":"Values are estimated and may vary.","opportunityResourceColumnLabel":"Opportunity","opportunitySavingsColumnLabel":"Estimated Savings","errorMissingAuditInfo":"Report error: no audit information","errorLabel":"Error!","warningHeader":"Warnings: ","auditGroupExpandTooltip":"Show audits","passedAuditsGroupTitle":"Passed audits","notApplicableAuditsGroupTitle":"Not applicable","manualAuditsGroupTitle":"Additional items to manually check","toplevelWarningsMessage":"There were issues affecting this run of Lighthouse:","scorescaleLabel":"Score scale:","crcLongestDurationLabel":"Maximum critical path latency:","crcInitialNavigation":"Initial Navigation","lsPerformanceCategoryDescription":"[Lighthouse](https://developers.google.com/web/tools/lighthouse/) analysis of the current page on an emulated mobile network. Values are estimated and may vary.","labDataTitle":"Lab Data"}}},"analysisUTCTimestamp":"2018-11-01T03:03:58.394Z"}
JavaScript
Per provare l'API PageSpeed Insights da JavaScript:
Copia il seguente codice. Il codice utilizza l'API PageSpeed Insights per misurare il rendimento degli
https://developers.google.com, quindi vengono visualizzati i risultati.
<script>
function run() {
const url = setUpQuery();
fetch(url)
.then(response => response.json())
.then(json => {
// See https://developers.google.com/speed/docs/insights/v5/reference/pagespeedapi/runpagespeed#response
// to learn more about each of the properties in the response object.
showInitialContent(json.id);
const cruxMetrics = {
"First Contentful Paint": json.loadingExperience.metrics.FIRST_CONTENTFUL_PAINT_MS.category,
"First Input Delay": json.loadingExperience.metrics.FIRST_INPUT_DELAY_MS.category
};
showCruxContent(cruxMetrics);
const lighthouse = json.lighthouseResult;
const lighthouseMetrics = {
'First Contentful Paint': lighthouse.audits['first-contentful-paint'].displayValue,
'Speed Index': lighthouse.audits['speed-index'].displayValue,
'Time To Interactive': lighthouse.audits['interactive'].displayValue,
'First Meaningful Paint': lighthouse.audits['first-meaningful-paint'].displayValue,
'First CPU Idle': lighthouse.audits['first-cpu-idle'].displayValue,
'Estimated Input Latency': lighthouse.audits['estimated-input-latency'].displayValue
};
showLighthouseContent(lighthouseMetrics);
});
}
function setUpQuery() {
const api = 'https://www.googleapis.com/pagespeedonline/v5/runPagespeed';
const parameters = {
url: encodeURIComponent('https://developers.google.com')
};
let query = `${api}?`;
for (key in parameters) {
query += `${key}=${parameters[key]}`;
}
return query;
}
function showInitialContent(id) {
document.body.innerHTML = '';
const title = document.createElement('h1');
title.textContent = 'PageSpeed Insights API Demo';
document.body.appendChild(title);
const page = document.createElement('p');
page.textContent = `Page tested: ${id}`;
document.body.appendChild(page);
}
function showCruxContent(cruxMetrics) {
const cruxHeader = document.createElement('h2');
cruxHeader.textContent = "Chrome User Experience Report Results";
document.body.appendChild(cruxHeader);
for (key in cruxMetrics) {
const p = document.createElement('p');
p.textContent = `${key}: ${cruxMetrics[key]}`;
document.body.appendChild(p);
}
}
function showLighthouseContent(lighthouseMetrics) {
const lighthouseHeader = document.createElement('h2');
lighthouseHeader.textContent = "Lighthouse Results";
document.body.appendChild(lighthouseHeader);
for (key in lighthouseMetrics) {
const p = document.createElement('p');
p.textContent = `${key}: ${lighthouseMetrics[key]}`;
document.body.appendChild(p);
}
}
run();
</script>
Incolla il codice in un file HTML.
Apri il file HTML in un browser. Al completamento, la pagina avrà il seguente aspetto:
Figura 1.
.
Figura 1. Demo JavaScript
di Gemini Advanced.
.
Passaggi successivi
Consulta la Risposta per saperne di più su ciascuna proprietà nel
.
