jqeury.base

min.js

//前台调用
var $ = function (args) {
    return new Base(args);
}

//基础库
function Base(args) {
    //创建一个数组，来保存获取的节点和节点数组
    this.elements = [];

    if (typeof args == 'string') {
        //css模拟
        if (args.indexOf(' ') != -1) {
            var elements = args.split(' ');            //把节点拆开分别保存到数组里
            var childElements = [];                    //存放临时节点对象的数组，解决被覆盖的问题
            var node = [];                                //用来存放父节点用的
            for (var i = 0; i < elements.length; i ++) {
                if (node.length == 0) node.push(document);        //如果默认没有父节点，就把document放入
                switch (elements[i].charAt(0)) {
                    case '#' :
                        childElements = [];                //清理掉临时节点，以便父节点失效，子节点有效
                        childElements.push(this.getId(elements[i].substring(1)));
                        node = childElements;        //保存父节点，因为childElements要清理，所以需要创建node数组
                        break;
                    case '.' :
                        childElements = [];
                        for (var j = 0; j < node.length; j ++) {
                            var temps = this.getClass(elements[i].substring(1), node[j]);
                            for (var k = 0; k < temps.length; k ++) {
                                childElements.push(temps[k]);
                            }
                        }
                        node = childElements;
                        break;
                    default :
                        childElements = [];
                        for (var j = 0; j < node.length; j ++) {
                            var temps = this.getTagName(elements[i], node[j]);
                            for (var k = 0; k < temps.length; k ++) {
                                childElements.push(temps[k]);
                            }
                        }
                        node = childElements;
                }
            }
            this.elements = childElements;
        } else {
            //find模拟
            switch (args.charAt(0)) {
                case '#' :
                    this.elements.push(this.getId(args.substring(1)));
                    break;
                case '.' :
                    this.elements = this.getClass(args.substring(1));
                    break;
                default :
                    this.elements = this.getTagName(args);
            }
        }
    } else if (typeof args == 'object') {
        if (args != undefined) {    //_this是一个对象，undefined也是一个对象，区别与typeof返回的带单引号的'undefined'
            this.elements[0] = args;
        }
    } else if (typeof args == 'function') {
        this.ready(args);
    }
}

//addDomLoaded
Base.prototype.ready = function (fn) {
    addDomLoaded(fn);
};

//获取ID节点
Base.prototype.getId = function (id) {
    return document.getElementById(id)
};

//获取元素节点数组
Base.prototype.getTagName = function (tag, parentNode) {
    var node = null;
    var temps = [];
    if (parentNode != undefined) {
        node = parentNode;
    } else {
        node = document;
    }
    var tags = node.getElementsByTagName(tag);
    for (var i = 0; i < tags.length; i ++) {
        temps.push(tags[i]);
    }
    return temps;
};

//获取CLASS节点数组
Base.prototype.getClass = function (className, parentNode) {
    var node = null;
    var temps = [];
    if (parentNode != undefined) {
        node = parentNode;
    } else {
        node = document;
    }
    var all = node.getElementsByTagName('*');
    for (var i = 0; i < all.length; i ++) {
        if ((new RegExp('(\\s|^)' +className +'(\\s|$)')).test(all[i].className)) {
            temps.push(all[i]);//('(\\s|^)' +className +'(\\s|$)')
        }
    }
    return temps;
}

//设置CSS选择器子节点
Base.prototype.find = function (str) {
    var childElements = [];
    for (var i = 0; i < this.elements.length; i ++) {
        switch (str.charAt(0)) {
            case '#' :
                childElements.push(this.getId(str.substring(1)));
                break;
            case '.' :
                var temps = this.getClass(str.substring(1), this.elements[i]);
                for (var j = 0; j < temps.length; j ++) {
                    childElements.push(temps[j]);
                }
                break;
            default :
                var temps = this.getTagName(str, this.elements[i]);
                for (var j = 0; j < temps.length; j ++) {
                    childElements.push(temps[j]);
                }
        }
    }
    this.elements = childElements;
    return this;
}

//获取某一个节点，并返回这个节点对象
Base.prototype.ge = function (num) {
    return this.elements[num];
};

//获取首个节点，并返回这个节点对象
Base.prototype.first = function () {
    return this.elements[0];
};

//获取末个节点，并返回这个节点对象
Base.prototype.last = function () {
    return this.elements[this.elements.length - 1];
};

//获取某组节点的数量
Base.prototype.length = function () {
    return this.elements.length;
};

//获取某一个节点的属性
Base.prototype.attr = function (attr, value) {
    for (var i = 0; i < this.elements.length; i ++) {
        if (arguments.length == 1) {
            return this.elements[i].getAttribute(attr);
        } else if (arguments.length == 2) {
            this.elements[i].setAttribute(attr, value);
        }
    }
    return this;
};

//获取某一个节点在整个节点组中是第几个索引
Base.prototype.index = function () {
    var children = this.elements[0].parentNode.children;
    for (var i = 0; i < children.length; i ++) {
        if (this.elements[0] == children[i]) return i;
    }
};

//设置某一个节点的透明度
Base.prototype.opacity = function (num) {
    for (var i = 0; i < this.elements.length; i ++) {
        this.elements[i].style.opacity = num / 100;
        this.elements[i].style.filter = 'alpha(opacity=' + num + ')';
    }
    return this;
};

//获取某一个节点，并且Base对象
Base.prototype.eq = function (num) {
    var element = this.elements[num];
    this.elements = [];
    this.elements[0] = element;
    return this;
};

//获取当前节点的下一个元素节点
Base.prototype.next = function () {
    for (var i = 0; i < this.elements.length; i ++) {
        this.elements[i] = this.elements[i].nextSibling;
        if (this.elements[i] == null) throw new Error('找不到下一个同级元素节点！');
        if (this.elements[i].nodeType == 3) this.next();
    }
    return this;
};

//获取当前节点的上一个元素节点
Base.prototype.prev = function () {
    for (var i = 0; i < this.elements.length; i ++) {
        this.elements[i] = this.elements[i].previousSibling;
        if (this.elements[i] == null) throw new Error('找不到上一个同级元素节点！');
        if (this.elements[i].nodeType == 3) this.prev();
    }
    return this;
};

//设置CSS
Base.prototype.css = function (attr, value) {
    for (var i = 0; i < this.elements.length; i ++) {
        if (arguments.length == 1) {
            return getStyle(this.elements[i], attr);
        }
        this.elements[i].style[attr] = value;
    }
    return this;
}

//添加Class
Base.prototype.addClass = function (className) {
    for (var i = 0; i < this.elements.length; i ++) {
        if (!hasClass(this.elements[i], className)) {
            this.elements[i].className += ' ' + className;
        }
    }
    return this;
}

//移除Class
Base.prototype.removeClass = function (className) {
    for (var i = 0; i < this.elements.length; i ++) {
        if (hasClass(this.elements[i], className)) {
            this.elements[i].className = this.elements[i].className.replace(new RegExp('(\\s|^)' +className +'(\\s|$)'), ' ');
        }
    }
    return this;
}

//添加link或style的CSS规则
Base.prototype.addRule = function (num, selectorText, cssText, position) {
    var sheet = document.styleSheets[num];
    insertRule(sheet, selectorText, cssText, position);
    return this;
}

//移除link或style的CSS规则
Base.prototype.removeRule = function (num, index) {
    var sheet = document.styleSheets[num];
    deleteRule(sheet, index);
    return this;
}

//设置表单字段元素
Base.prototype.form = function (name) {
    for (var i = 0; i < this.elements.length; i ++) {
        this.elements[i] = this.elements[i][name];
    }
    return this;
};

//设置表单字段内容获取
Base.prototype.value = function (str) {
    for (var i = 0; i < this.elements.length; i ++) {
        if (arguments.length == 0) {
            return this.elements[i].value;
        }
        this.elements[i].value = str;
    }
    return this;
}

//设置innerHTML
Base.prototype.html = function (str) {
    for (var i = 0; i < this.elements.length; i ++) {
        if (arguments.length == 0) {
            return this.elements[i].innerHTML;
        }
        this.elements[i].innerHTML = str;
    }
    return this;
}

//设置innerText
Base.prototype.text = function (str) {
    for (var i = 0; i < this.elements.length; i ++) {
        if (arguments.length == 0) {
            return getInnerText(this.elements[i]);
        }
        setInnerText(this.elements[i], text);
    }
    return this;
}

//设置事件发生器
Base.prototype.bind = function (event, fn) {
    for (var i = 0; i < this.elements.length; i ++) {
        addEvent(this.elements[i], event, fn);
    }
    return this;
};

//设置鼠标移入移出方法
Base.prototype.hover = function (over, out) {
    for (var i = 0; i < this.elements.length; i ++) {
        addEvent(this.elements[i], 'mouseover', over);
        addEvent(this.elements[i], 'mouseout', out);
    }
    return this;
};

//设置点击切换方法
Base.prototype.toggle = function () {
    for (var i = 0; i < this.elements.length; i ++) {
        (function (element, args) {
            var count = 0;
            addEvent(element, 'click', function () {
                args[count++ % args.length].call(this);
            });
        })(this.elements[i], arguments);
    }
    return this;
};

//设置显示
Base.prototype.show = function () {
    for (var i = 0; i < this.elements.length; i ++) {
        this.elements[i].style.display = 'block';
    }
    return this;
};

//设置隐藏
Base.prototype.hide = function () {
    for (var i = 0; i < this.elements.length; i ++) {
        this.elements[i].style.display = 'none';
    }
    return this;
};

//设置物体居中
Base.prototype.center = function (width, height) {
    var top = (getInner().height - height) / 2 + getScroll().top;
    var left = (getInner().width - width) / 2 + getScroll().left;
    for (var i = 0; i < this.elements.length; i ++) {
        this.elements[i].style.top = top + 'px';
        this.elements[i].style.left = left + 'px';
    }
    return this;
};

//锁屏功能
Base.prototype.lock = function () {
    for (var i = 0; i < this.elements.length; i ++) {
        fixedScroll.top = getScroll().top;
        fixedScroll.left = getScroll().left;
        this.elements[i].style.width = getInner().width + getScroll().left + 'px';
        this.elements[i].style.height = getInner().height + getScroll().top + 'px';
        this.elements[i].style.display = 'block';
        parseFloat(sys.firefox) < 4 ? document.body.style.overflow = 'hidden' : document.documentElement.style.overflow = 'hidden';
        addEvent(this.elements[i], 'mousedown', predef);
        addEvent(this.elements[i], 'mouseup', predef);
        addEvent(this.elements[i], 'selectstart', predef);
        addEvent(window, 'scroll', fixedScroll);
    }
    return this;
};

Base.prototype.unlock = function () {
    for (var i = 0; i < this.elements.length; i ++) {
        this.elements[i].style.display = 'none';
        parseFloat(sys.firefox) < 4 ? document.body.style.overflow = 'auto' : document.documentElement.style.overflow = 'auto';
        removeEvent(this.elements[i], 'mousedown', predef);
        removeEvent(this.elements[i], 'mouseup', predef);
        removeEvent(this.elements[i], 'selectstart', predef);
        removeEvent(window, 'scroll', fixedScroll);
    }
    return this;
};

//触发点击事件
Base.prototype.click = function (fn) {
    for (var i = 0; i < this.elements.length; i ++) {
        this.elements[i].onclick = fn;
    }
    return this;
};

//触发浏览器窗口事件
Base.prototype.resize = function (fn) {
    for (var i = 0; i < this.elements.length; i ++) {
        var element = this.elements[i];
        addEvent(window, 'resize', function () {
            fn();
            if (element.offsetLeft > getInner().width + getScroll().left - element.offsetWidth) {
                element.style.left = getInner().width + getScroll().left - element.offsetWidth + 'px';
                if (element.offsetLeft <= 0 + getScroll().left) {
                    element.style.left = 0 + getScroll().left + 'px';
                }
            }
            if(element.offsetTop > getInner().height + getScroll().top - element.offsetHeight) {
                element.style.top = getInner().height + getScroll().top - element.offsetHeight + 'px';
                if (element.offsetTop <= 0 + getScroll().top) {
                    element.style.top = 0 + getScroll().top + 'px';
                }
            }
        });
    }
    return this;
};

//设置动画
Base.prototype.animate = function (obj) {
    for (var i = 0; i < this.elements.length; i ++) {
        var element = this.elements[i];
        var attr = obj['attr'] == 'x' ? 'left' : obj['attr'] == 'y' ? 'top' :
                       obj['attr'] == 'w' ? 'width' : obj['attr'] == 'h' ? 'height' :
                       obj['attr'] == 'o' ? 'opacity' : obj['attr'] != undefined ? obj['attr'] : 'left';

        var start = obj['start'] != undefined ? obj['start'] :
                        attr == 'opacity' ? parseFloat(getStyle(element, attr)) * 100 :
                                                   parseInt(getStyle(element, attr));

        var t = obj['t'] != undefined ? obj['t'] : 10;                                                //可选，默认10毫秒执行一次
        var step = obj['step'] != undefined ? obj['step'] : 20;                                //可选，每次运行10像素

        var alter = obj['alter'];
        var target = obj['target'];
        var mul = obj['mul'];

        var speed = obj['speed'] != undefined ? obj['speed'] : 6;                            //可选，默认缓冲速度为6
        var type = obj['type'] == 0 ? 'constant' : obj['type'] == 1 ? 'buffer' : 'buffer';        //可选，0表示匀速，1表示缓冲，默认缓冲

        if (alter != undefined && target == undefined) {
            target = alter + start;
        } else if (alter == undefined && target == undefined && mul == undefined) {
            throw new Error('alter增量或target目标量必须传一个！');
        }

        if (start > target) step = -step;

        if (attr == 'opacity') {
            element.style.opacity = parseInt(start) / 100;
            element.style.filter = 'alpha(opacity=' + parseInt(start) +')';
        } else {
            //element.style[attr] = start + 'px';
        }

        if (mul == undefined) {
            mul = {};
            mul[attr] = target;
        } 

        clearInterval(element.timer);
        element.timer = setInterval(function () {

            /*
                问题1：多个动画执行了多个列队动画，我们要求不管多少个动画只执行一个列队动画
                问题2：多个动画数值差别太大，导致动画无法执行到目标值，原因是定时器提前清理掉了

                解决1：不管多少个动画，只提供一次列队动画的机会
                解决2：多个动画按最后一个分动画执行完毕后再清理即可
            */

            //创建一个布尔值，这个值可以了解多个动画是否全部执行完毕
            var flag = true; //表示都执行完毕了

            for (var i in mul) {
                attr = i == 'x' ? 'left' : i == 'y' ? 'top' : i == 'w' ? 'width' : i == 'h' ? 'height' : i == 'o' ? 'opacity' : i != undefined ? i : 'left';
                target = mul[i];

                if (type == 'buffer') {
                    step = attr == 'opacity' ? (target - parseFloat(getStyle(element, attr)) * 100) / speed :
                                                         (target - parseInt(getStyle(element, attr))) / speed;
                    step = step > 0 ? Math.ceil(step) : Math.floor(step);
                }

                if (attr == 'opacity') {
                    if (step == 0) {
                        setOpacity();
                    } else if (step > 0 && Math.abs(parseFloat(getStyle(element, attr)) * 100 - target) <= step) {
                        setOpacity();
                    } else if (step < 0 && (parseFloat(getStyle(element, attr)) * 100 - target) <= Math.abs(step)) {
                        setOpacity();
                    } else {
                        var temp = parseFloat(getStyle(element, attr)) * 100;
                        element.style.opacity = parseInt(temp + step) / 100;
                        element.style.filter = 'alpha(opacity=' + parseInt(temp + step) + ')';
                    }

                    if (parseInt(target) != parseInt(parseFloat(getStyle(element, attr)) * 100)) flag = false;

                } else {
                    if (step == 0) {
                        setTarget();
                    } else if (step > 0 && Math.abs(parseInt(getStyle(element, attr)) - target) <= step) {
                        setTarget();
                    } else if (step < 0 && (parseInt(getStyle(element, attr)) - target) <= Math.abs(step)) {
                        setTarget();
                    } else {
                        element.style[attr] = parseInt(getStyle(element, attr)) + step + 'px';
                    }

                    if (parseInt(target) != parseInt(getStyle(element, attr))) flag = false;
                }

                //document.getElementById('test').innerHTML += i + '--' + parseInt(target) + '--' + parseInt(getStyle(element, attr)) + '--' + flag + '<br />';

            }

            if (flag) {
                clearInterval(element.timer);
                if (obj.fn != undefined) obj.fn();
            }

        }, t);

        function setTarget() {
            element.style[attr] = target + 'px';
        }

        function setOpacity() {
            element.style.opacity = parseInt(target) / 100;
            element.style.filter = 'alpha(opacity=' + parseInt(target) + ')';
        }
    }
    return this;
};

//插件入口
Base.prototype.extend = function (name, fn) {
    Base.prototype[name] = fn;
};

tool.js

//浏览器检测
(function () {
    window.sys = {};
    var ua = navigator.userAgent.toLowerCase();
    var s;
    (s = ua.match(/msie ([\d.]+)/)) ? sys.ie = s[1] :
    (s = ua.match(/firefox\/([\d.]+)/)) ? sys.firefox = s[1] :
    (s = ua.match(/chrome\/([\d.]+)/)) ? sys.chrome = s[1] :
    (s = ua.match(/opera\/.*version\/([\d.]+)/)) ? sys.opera = s[1] :
    (s = ua.match(/version\/([\d.]+).*safari/)) ? sys.safari = s[1] : 0;

    if (/webkit/.test(ua)) sys.webkit = ua.match(/webkit\/([\d.]+)/)[1];
})();

//DOM加载
function addDomLoaded(fn) {
    var isReady = false;
    var timer = null;
    function doReady() {
        if (timer) clearInterval(timer);
        if (isReady) return;
        isReady = true;
        fn();
    }

    if ((sys.opera && sys.opera < 9) || (sys.firefox && sys.firefox < 3) || (sys.webkit && sys.webkit < 525)) {
        //无论采用哪种，基本上用不着了
        /*timer = setInterval(function () {
            if (/loaded|complete/.test(document.readyState)) {     //loaded是部分加载，有可能只是DOM加载完毕，complete是完全加载，类似于onload
                doReady();
            }
        }, 1);*/

        timer = setInterval(function () {
            if (document && document.getElementById && document.getElementsByTagName && document.body) {
                doReady();
            }
        }, 1);
    } else if (document.addEventListener) {//W3C
        addEvent(document, 'DOMContentLoaded', function () {
            fn();
            removeEvent(document, 'DOMContentLoaded', arguments.callee);
        });
    } else if (sys.ie && sys.ie < 9){
        var timer = null;
        timer = setInterval(function () {
            try {
                document.documentElement.doScroll('left');
                doReady();
            } catch (e) {};
        }, 1);
    }
}

//跨浏览器添加事件绑定
function addEvent(obj, type, fn) {
    if (typeof obj.addEventListener != 'undefined') {
        obj.addEventListener(type, fn, false);
    } else {
        //创建一个存放事件的哈希表(散列表)
        if (!obj.events) obj.events = {};
        //第一次执行时执行
        if (!obj.events[type]) {
            //创建一个存放事件处理函数的数组
            obj.events[type] = [];
            //把第一次的事件处理函数先储存到第一个位置上
            if (obj['on' + type]) obj.events[type][0] = fn;
        } else {
            //同一个注册函数进行屏蔽，不添加到计数器中
            if (addEvent.equal(obj.events[type], fn)) return false;
        }
        //从第二次开始我们用事件计数器来存储
        obj.events[type][addEvent.ID++] = fn;
        //执行事件处理函数
        obj['on' + type] = addEvent.exec;
    }
}

//为每个事件分配一个计数器
addEvent.ID = 1;

//执行事件处理函数
addEvent.exec = function (event) {
    var e = event || addEvent.fixEvent(window.event);
    var es = this.events[e.type];
    for (var i in es) {
        es[i].call(this, e);
    }
};

//同一个注册函数进行屏蔽
addEvent.equal = function (es, fn) {
    for (var i in es) {
        if (es[i] == fn) return true;
    }
    return false;
}

//把IE常用的Event对象配对到W3C中去
addEvent.fixEvent = function (event) {
    event.preventDefault = addEvent.fixEvent.preventDefault;
    event.stopPropagation = addEvent.fixEvent.stopPropagation;
    event.target = event.srcElement;
    return event;
};

//IE阻止默认行为
addEvent.fixEvent.preventDefault = function () {
    this.returnValue = false;
};

//IE取消冒泡
addEvent.fixEvent.stopPropagation = function () {
    this.cancelBubble = true;
};

//跨浏览器删除事件
function removeEvent(obj, type, fn) {
    if (typeof obj.removeEventListener != 'undefined') {
        obj.removeEventListener(type, fn, false);
    } else {
        if (obj.events) {
            for (var i in obj.events[type]) {
                if (obj.events[type][i] == fn) {
                    delete obj.events[type][i];
                }
            }
        }
    }
}

//跨浏览器获取视口大小
function getInner() {
    if (typeof window.innerWidth != 'undefined') {
        return {
            width : window.innerWidth,
            height : window.innerHeight
        }
    } else {
        return {
            width : document.documentElement.clientWidth,
            height : document.documentElement.clientHeight
        }
    }
}

//跨浏览器获取滚动条位置
function getScroll() {
    return {
        top : document.documentElement.scrollTop || document.body.scrollTop,
        left : document.documentElement.scrollLeft || document.body.scrollLeft
    }
}

//跨浏览器获取Style
function getStyle(element, attr) {
    var value;
    if (typeof window.getComputedStyle != 'undefined') {//W3C
        value = window.getComputedStyle(element, null)[attr];
    } else if (typeof element.currentStyle != 'undeinfed') {//IE
        value = element.currentStyle[attr];
    }
    return value;
}

//判断class是否存在
function hasClass(element, className) {
    return element.className.match(new RegExp('(\\s|^)' +className +'(\\s|$)'));
}

//跨浏览器添加link规则
function insertRule(sheet, selectorText, cssText, position) {
    if (typeof sheet.insertRule != 'undefined') {//W3C
        sheet.insertRule(selectorText + '{' + cssText + '}', position);
    } else if (typeof sheet.addRule != 'undefined') {//IE
        sheet.addRule(selectorText, cssText, position);
    }
}

//跨浏览器移出link规则
function deleteRule(sheet, index) {
    if (typeof sheet.deleteRule != 'undefined') {//W3C
        sheet.deleteRule(index);
    } else if (typeof sheet.removeRule != 'undefined') {//IE
        sheet.removeRule(index);
    }
}

//跨浏览器获取innerText
function getInnerText(element) {
    return (typeof element.textContent == 'string') ? element.textContent : element.innerText;
}

//跨浏览器设置innerText
function setInnerText(elememt, text) {
    if (typeof element.textContent == 'string') {
        element.textContent = text;
    } else {
        element.innerText = text;
    }
}

//获取某一个元素到最外层顶点的位置
function offsetTop(element) {
    var top = element.offsetTop;
    var parent = element.offsetParent;
    while (parent != null) {
        top += parent.offsetTop;
        parent = parent.offsetParent;
    }
    return top;
}

//删除左后空格
function trim(str) {
    return str.replace(/(^\s*)|(\s*$)/g, '');
}

//某一个值是否存在某一个数组中
function inArray(array, value) {
    for (var i in array) {
        if (array[i] === value) return true;
    }
    return false;
}

//获取某一个节点的上一个节点的索引
function prevIndex(current, parent) {
    var length = parent.children.length;
    if (current == 0) return length - 1;
    return parseInt(current) - 1;
}

//获取某一个节点的下一个节点的索引
function nextIndex(current, parent) {
    var length = parent.children.length;
    if (current == length - 1) return 0;
    return parseInt(current) + 1;
}

//滚动条固定
function fixedScroll() {
    window.scrollTo(fixedScroll.left, fixedScroll.top);
}

//阻止默认行为
function predef(e) {
    e.preventDefault();
}

//创建cookie
function setCookie(name, value, expires, path, domain, secure) {
    var cookieText = encodeURIComponent(name) + '=' + encodeURIComponent(value);
    if (expires instanceof Date) {
        cookieText += '; expires=' + expires;
    }
    if (path) {
        cookieText += '; expires=' + expires;
    }
    if (domain) {
        cookieText += '; domain=' + domain;
    }
    if (secure) {
        cookieText += '; secure';
    }
    document.cookie = cookieText;
}

//获取cookie
function getCookie(name) {
    var cookieName = encodeURIComponent(name) + '=';
    var cookieStart = document.cookie.indexOf(cookieName);
    var cookieValue = null;
    if (cookieStart > -1) {
        var cookieEnd = document.cookie.indexOf(';', cookieStart);
        if (cookieEnd == -1) {
            cookieEnd = document.cookie.length;
        }
        cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + cookieName.length, cookieEnd));
    }
    return cookieValue;
}

//删除cookie
function unsetCookie(name) {
    document.cookie = name + "= ; expires=" + new Date(0);
}