Function hasClass

lazysizes.js:106–111

(ele, cls)

	 * @param cls {string}
	 */
	var hasClass = function(ele, cls) {
		if(!regClassCache[cls]){
			regClassCache[cls] = new RegExp('(\\s|^)'+cls+'(\\s|$)');
		}
		return regClassCache[cls].test(ele[_getAttribute]('class') || '') && regClassCache[cls];
	};

	/**
	 * @param ele {Element}