precisetime
Version:
timing function for Rhino, node, browsers, natively present in JSC
49 lines (48 loc) • 1.57 kB
JavaScript
/*! (C) WebReflection - Mit Style License
* thanks @jdalton for different hints
* https://github.com/WebReflection/preciseTime
* --------------------------------------------- */
!function(exports, preciseTime){
// JSC has it right, kudos!
if (!exports.preciseTime) {
// all possibilities + inline "does it work?" check
try {
// W3C Performance instance
(preciseTime = function preciseTime() {
return performance.now();
})();
} catch(o_O) {try {
// Chrome exposes it via prefixed method
(preciseTime = function preciseTime() {
return performance.webkitNow();
})();
} catch(o_O) {try {
// node.js v0.8+ process.hrtime
(preciseTime = function preciseTime() {
return parseFloat(process.hrtime().join("."));
})();
} catch(o_O) {try {
// node.js via microtime module
(preciseTime = function preciseTime() {
return require("microtime").nowDouble();
})();
} catch(o_O) {try {
// Rhino
(preciseTime = function preciseTime() {
return java.lang.System.nanoTime() / 1000000000;
})();
} catch(o_O) {try {
// IE via IEJST https://github.com/kentaromiura/IEJST
(preciseTime = function preciseTime(){
return +exports.external.preciseTime();
})();
} catch(o_O) {
// browsers or fallback
// if this throw, this is not a JS env ...
(preciseTime = function preciseTime() {
return new Date / 1000;
})();
}}}}}}
exports.preciseTime = preciseTime;
}
}(this);