function fontSize() {

	var view_width = document.getElementsByTagName('html')[0].getBoundingClientRect().width;

	var _html = document.getElementsByTagName('html')[0];

	view_width > 768 ? _html.style.fontSize = 100 * 768 / 375 + 'px' : _html.style.fontSize = view_width * 100 / 375 + 'px';

}

fontSize();

window.onresize = function() {

	fontSize();

}

var htmlHeigt=window.innerHeight;

var rebate_home=document.getElementsByClassName('rebate_home')[0].clientHeight;

this.offset={

		height:(htmlHeigt-rebate_home)+'px',

		background:'#eff0f4'

	}

this.offset=htmlHeigt>rebate_home?{

		height:htmlHeigt+'px'

		}:{

			height:rebate_home+'px'

		}