Memorable style switching effect code download using cookies_javascript skills

The main codes used in the sample code example of switching styles without refreshing cookies

Copy the code The code is as follows:

< style>





red
blue


blue

left

right

styleswitcher .js

Copy code The code is as follows:

// styleswitcher.js

function setActiveStyleSheet(title)
{
    var i, a, main;

    for(i = 0; (a = document.getElementsByTagName("link")[i]); i )
    {
        if (a.getAttribute("rel").indexOf("style") != -1 && 
            a.getAttribute("title"))
        {
            a.disabled = true;

            if (a.getAttribute("title") == title) 
                a.disabled = false;
        }
    }
}

function getActiveStyleSheet()
{
    var i, a;

    for(i = 0; (a = document.getElementsByTagName("link")[i]); i )
    {
        if(a.getAttribute("rel").indexOf("style") != -1 && 
           a.getAttribute("title") && ! a.disabled)
            return a.getAttribute("title");
    }

    return null;
}

function getPreferredStyleSheet()
{
    var i, a;

    for (i = 0; (a = document.getElementsByTagName("link")[i]); i )
    {
        if(a.getAttribute("rel").indexOf("style") != -1 &&
           a.getAttribute("rel").indexOf("alt") == -1 &&
           a.getAttribute("title"))
            return a.getAttribute("title");
    }

    return null;
}

function createCookie(name, value, days)
{
    if (days)
    {
        var date = new Date();
        date.setTime(date.getTime()   (days * 24 * 60 * 60 * 1000));
        var expires = "; expires="   date.toGMTString();
    }

    else expires = "";
    document.cookie = name   "="   value   expires   "; path=/";
}

function readCookie(name)
{
    var nameEQ = name   "=";
    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, c.length);

        if (c.indexOf(nameEQ) == 0)
            return c.substring(nameEQ.length, c.length);
    }

    return null;
}

window.onload = function(e)
{
    var cookie = readCookie("style");
    var title = cookie ? cookie : getPreferredStyleSheet();

    setActiveStyleSheet(title);
}

window.onunload = function(e)
{
    var title = getActiveStyleSheet();

    createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);

red.css

Copy code The code is as follows:

#left                                   right;}

red.css

Copy code The code is as follows:

#left { background-color:#FF0000;float:left; }