context: this.getChildByClass = function(node){    for (var i = 1; i < arguments.length; ++i)    {        var className = arguments[i];        var child = node.firstChild;        node = null;        for (; child; child = child.nextSibling)        {            if (this.hasClass(child, className))            {                node = child;                break;            }        }    }        return node;};
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