script.js

lynda.com 2007年出品的javascript essential training教学视频(Dori Smith主讲)的配套源码。

window.onload = initPage;

function initPage() {
	var now = new Date();
	var lastVisit = new Date(cookieVal("pageVisit"));
	var expireDate = new Date();
	expireDate.setMonth(expireDate.getMonth()+6);

	document.cookie = "pageVisit=" + now + ";path=/;expires=" + expireDate.toGMTString();
	var allGrafs = document.getElementsByTagName("p");

	for (var i=0; i<allGrafs.length; i++) {
		if (allGrafs[i].id.indexOf("New-") != -1) {
			newCheck(allGrafs[i],allGrafs[i].id.substring(4));
		}
	}

	function newCheck(grafElement,dtString) {

		var yyyy = parseInt(dtString.substring(0,4),10);
		var mm = parseInt(dtString.substring(4,6),10);
		var dd = parseInt(dtString.substring(6,8),10);
		var lastChgd = new Date(yyyy,mm-1,dd);

		if (lastChgd.getTime() > lastVisit.getTime()) {
			if (grafElement.className == "") {
				grafElement.className = "newImg";
			}
			else {
				grafElement.className =  "newImg " + grafElement.className;
			}
		}
	}
}

function cookieVal(cookieName) {
	var thisCookie = document.cookie.split("; ");

	for (var i=0; i<thisCookie.length; i++) {
		if (cookieName == thisCookie[i].split("=")[0]) {
			return thisCookie[i].split("=")[1];
		}
	}
	return "1 January 1970";
}