lib/tethys.js
function(cls){
        var has = false, reg = new RegExp('\\b' + cls + '\\b');

        this.each(function(el){
            has = has || !!el.className.match(reg);
        });
        
        return has;
    }
function(cls){
        var has = false, reg = new RegExp('\\b' + cls + '\\b');

        this.each(function(el){
            has = has || !!el.className.match(reg);
        });
        
        return has;
    }
检查是否有class