判斷mac電腦系統和"Safari"and"Chrome"

var isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") || (navigator.platform == "Macintosh") || (navigator.platform == "MacIntel"); 
	if(navigator.userAgent.indexOf("Safari") > -1 && navigator.userAgent.indexOf("Chrome") == -1){
		$('.bukacn_main').css('padding-top','58.5%')
	}else if(isMac){
		$('.bukacn_main').css('padding-top','58.5%')
	}