讓Ext JS 2 支援IE9

增加下列語法即可

if (typeof Range.prototype.createContextualFragment == "undefined") {
    Range.prototype.createContextualFragment = function(html) {
        var doc = this.startContainer.ownerDocument;
        var container = doc.createElement("div");
        container.innerHTML = html;
        var frag = doc.createDocumentFragment(), n;
        while ( (n = container.firstChild) ) {
            frag.appendChild(n);
        }
        return frag;
    };
}