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December 20, 2015 17:09
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bits and bobs from the presentation at http://www.83rdstasis.net/devtoolsecrets/slides/london-web/
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console.log('Captain\'s Log 1', new Date()); | |
console.info('Ammo supplies moderate'); | |
console.debug('Shield\'s are up'); | |
console.warn('Unidentified craft appearing'); | |
console.error('Fire in the cargo bay');Run | |
console.assert(false, 'Not true'); // say 'Not True' only if 1st param === false | |
console.group('My group'); | |
// … | |
// sub-groups are ok | |
console.groupEnd(); | |
console.time('timerName'); | |
// … | |
// sub timers are ok | |
console.timeEnd('timerName'); | |
console.trace(); | |
console.table(data); | |
console.table(data, ["col name 1", "col name 2"]); | |
$0 // current element selected | |
$1 // previous element selected (Chrome, Firebug, Opera, Opera Next, Safari) | |
$2, $3, $4 // history of previous elements selected (Chrome, Opera Next, Safari) | |
$_ // result of previous expression | |
monitorEvents(elem); // Monitor all events triggered on a particular DOM element. | |
unmonitorEvents(elem); | |
// Record new Timeline (frames, memory) | |
console.timeline("drawing pixels") | |
// … | |
console.timelineEnd("drawing pixels") | |
// Label the TimeLine | |
console.timeStamp("Adding resul") | |
// Record new JavaScript CPU profile | |
console.profile("drawing pixels") | |
// … | |
console.profileEnd("drawing pixels") | |
// Inspect object in Elements, Source or Profiles | |
inspect(document.body.firstChild) // Elements | |
inspect(someFunctionName) // Sources | |
// Copy object as a *string* to clipboard | |
copy($0) | |
copy(document.body) | |
// Query DOM elements from console | |
$$(someSelector) // = document.querySelectorAll(someSelector) |
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