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21 lines
546 B
21 lines
546 B
let startTime;
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let windowInterval;
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const displayTime = () => {
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// console.log(Date.now()-startTime);
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document.querySelector('h1').innerHTML = Math.floor((Date.now()-startTime)/1000);
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}
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document.querySelector('.btn-primary').addEventListener('click', (event) => {
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startTime=Date.now();
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windowInterval = window.setInterval(displayTime,1000)
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})
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document.querySelector('.btn-secondary').addEventListener('click', (event) => {
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window.clearInterval(windowInterval)
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})
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window.onbeforeunload = function(){
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return 'Good bye'
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}
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