javascript-sessionclear.js

function init(){
			var hours = 1/2; //Storage expiration time - 30 mins
			var now = new Date().getTime();
			var prevClickTime = sessionStorage.getItem('prevClickTime');
			if (prevClickTime == null) {
			    sessionStorage.setItem('prevClickTime', now);
			    sessionStorage.setItem('curClickTime', now);
			} else {
				var curClickTime = sessionStorage.getItem('curClickTime');
				prevClickTime = curClickTime;
				curClickTime = now;
				var delta = curClickTime - prevClickTime;
		        //console.log(delta+"...."+hours*60*60*1000);
			    if(delta > hours*60*60*1000) {
			        sessionStorage.clear();
			        //console.log('clear...')
			    } else {
			    	//console.log('noclear...')
					sessionStorage.setItem('prevClickTime', prevClickTime);
			        sessionStorage.setItem('curClickTime', curClickTime);
			    }
			}
		}