window.scrollTo(0, 200) // move to absolute coordinate
window.scrollBy(0, 50) // move 50 px downward
window.scrollBy(0, -50) // move 50 px upward
setInterval('console.log(it will be repeated every 1 second.)', 1000);
setTimeout('console.log(it will excute after 3 seconds)', 3000);
window.history.current // current url address
window.history.previous // previous url address
window.history.length // number of urls saved in browser's history
history.back() // move to the previous page
history.forward // move to the next page
location.reload() // refresh the page
location.replace // replace current url with new url
location.href // url of the document
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