JS中的cookie

<script>
//設置cookie
function setCookie(cname, cvalue, exdays) {//輸入要設置的屬性名、對應的值、過期時間
    var d = new Date();
    d.setTime(d.getTime() + (exdays*24*60*60*1000));
    var expires = "expires="+d.toUTCString();
    document.cookie = cname + "=" + cvalue + "; " + expires;
}
//獲取cookie
function getCookie(cname) {
    var name = cname + "=";
    var ca = document.cookie.split(';');
    for(var i=0; i<ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1);
        if (c.indexOf(name) != -1) return c.substring(name.length, c.length);
    }
    return "";
}
//清除cookie  
function clearCookie(name) {  
    setCookie(name, "", -1);  
}  
function checkCookie() {
    var user = getCookie("username");
    if (user != "") {
        alert("Welcome again " + user);
    } else {
        user = prompt("Please enter your name:", "");
        if (user != "" && user != null) {
            setCookie("username", user, 365);
        }
    }
}
checkCookie(); 
</script>

cookie.js

function createCookie(name,value,days,path,domain,secure){//創建Cookie
	if(dyas){
		var myday = new Date();
		myday.setTime(myday.getTime() + (myday*60*60*24*1000));
		var expires = myday.toGMTString();
	}else var expires = "";

	cookieString = name + "=" + escape(value);
	if(expires) cookieString += " ;expires =" +expires;
	if(path) cookieString += ";path = " +escape(path);
	if(domain) cookieString += ";domain = " +escape(domain);
	if(secure) cookieString += ";secure =" +escape(secure);
	document.cookie = cookieString;
}

function getCookie(name){
	var nameEquals = name + "=";
	var crus = document.cookie.split(";");
	for(var i = 0;i<crus.length;i++){
		var cru = crus[i];
		if(cru.indexOf(nameEquals)==0){
			return unescape(cru.substring(nameEquals.length,cru.length));
		}
	}
	return null;
}

function delCookie(){
	createCookie(name,"",-1);
}