28 lines
841 B
JavaScript
28 lines
841 B
JavaScript
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module.exports = process.hrtime || hrtime
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// polyfil for window.performance.now
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var performance = global.performance || {}
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var performanceNow =
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performance.now ||
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performance.mozNow ||
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performance.msNow ||
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performance.oNow ||
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performance.webkitNow ||
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function(){ return (new Date()).getTime() }
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// generate timestamp or delta
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// see http://nodejs.org/api/process.html#process_process_hrtime
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function hrtime(previousTimestamp){
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var clocktime = performanceNow.call(performance)*1e-3
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var seconds = Math.floor(clocktime)
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var nanoseconds = Math.floor((clocktime%1)*1e9)
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if (previousTimestamp) {
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seconds = seconds - previousTimestamp[0]
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nanoseconds = nanoseconds - previousTimestamp[1]
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if (nanoseconds<0) {
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seconds--
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nanoseconds += 1e9
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}
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}
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return [seconds,nanoseconds]
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}
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