jq 动态添加css样式

var numLength = 10000
		var $style = $('<style type="text/css">\
			@keyframes move {\
			    0% {\
			        transform: translate(0, 0);\
			    }\
			    100% {\
			        transform: translate(0, -' + (numLength - $(window).height()) + 'px);\
			    }\
			}\
		</style>');
        $($('head')[0]).append($style);