Polyfill_IE8.js

!this.addEventListener && this.Element && (function () {
    function addToPrototype(name, method) {
        Window.prototype[name] = HTMLDocument.prototype[name] = Element.prototype[name] = method;
    }
 
    var registry = [];
 
    addToPrototype("addEventListener", function (type, listener) {
        var target = this;
 
        registry.unshift({
            __listener: function (event) {
                event.currentTarget = target;
                event.pageX = event.clientX + document.documentElement.scrollLeft;
                event.pageY = event.clientY + document.documentElement.scrollTop;
                event.preventDefault = function () { event.returnValue = false };
                event.relatedTarget = event.fromElement || null;
                event.stopPropagation = function () { event.cancelBubble = true };
                event.relatedTarget = event.fromElement || null;
                event.target = event.srcElement || target;
                event.timeStamp = +new Date;

                listener.call(target, event);
            },
            listener: listener,
            target: target,
            type: type
        });
 
        this.attachEvent("on" + type, registry[0].__listener);
    });
 
    addToPrototype("removeEventListener", function (type, listener) {
        for (var index = 0, length = registry.length; index < length; ++index) {
            if (registry[index].target == this && registry[index].type == type && registry[index].listener == listener) {
                return this.detachEvent("on" + type, registry.splice(index, 1)[0].__listener);
            }
        }
    });
 
    addToPrototype("dispatchEvent", function (eventObject) {
        try {
            return this.fireEvent("on" + eventObject.type, eventObject);
        } catch (error) {
            for (var index = 0, length = registry.length; index < length; ++index) {
                if (registry[index].target == this && registry[index].type == eventObject.type) {
                    registry[index].call(this, eventObject);
                }
            }
        }
    });
})();

!window.getComputedStyle && (function() {
    window.getComputedStyle = function(el, pseudo) {
        this.el = el;
        this.getPropertyValue = function(prop) {
            var re = /(\-([a-z]){1})/g;
            if (prop == 'float') prop = 'styleFloat';
            if (re.test(prop)) {
                prop = prop.replace(re, function () {
                    return arguments[2].toUpperCase();
                });
            }
            return el.currentStyle[prop] ? el.currentStyle[prop] : null;
        }
        return this;
    }
})();


!document.getElementsByClassName && this.Element && (function() {
    var indexOf = [].indexOf || function(prop) {
        for (var i = 0; i < this.length; i++) {
            if (this[i] === prop) return i;
        }
        return -1;
    };
    getElementsByClassName = function(className,context) {
        var elems = document.querySelectorAll ? context.querySelectorAll("." + className) : (function() {
            var all = context.getElementsByTagName("*"),
                elements = [],
                i = 0;
            for (; i < all.length; i++) {
                if (all[i].className && (" " + all[i].className + " ").indexOf(" " + className + " ") > -1 && indexOf.call(elements,all[i]) === -1) elements.push(all[i]);
            }
            return elements;
        })();
        return elems;
    };
    document.getElementsByClassName = function(className) {
        return getElementsByClassName(className,document);
    };
    Element.prototype.getElementsByClassName = function(className) {
        return getElementsByClassName(className,this);
    };
})();