附件俩个：

js代码如下：

var pullrefresh = {
	init : function() {
		var pos = {};
		var status = false;
		var divobj = null;
		var contentobj = null;
		var reloadflag = false;
		$('body').on('touchstart', function(e) {
			e = mygetnativeevent(e);
			pos.startx = e.touches[0].pageX;
			pos.starty = e.touches[0].pageY;
		})
		.on('touchmove', function(e) {
			e = mygetnativeevent(e);
			pos.curposx = e.touches[0].pageX;
			pos.curposy = e.touches[0].pageY;
			if(pos.curposy - pos.starty < 0 && !status) {
				return;
			}
			if(!status && $(window).scrollTop() <= 0) {
				status = true;
				divobj = document.createElement('div');
				divobj = $(divobj);
				divobj.css({'position':'relative', 'margin-left':'-85px'});
				$('body').prepend(divobj);
				contentobj = document.createElement('div');
				contentobj = $(contentobj);
				contentobj.css({'position':'absolute', 'height':'30px', 'top': '-30px', 'left':'50%'});
				contentobj.html('<img src="icon_arrow.gif" style="vertical-align:middle;margin-right:5px;-moz-transform:rotate(180deg);-webkit-transform:rotate(180deg);-o-transform:rotate(180deg);transform:rotate(180deg);"><span id="refreshtxt">下拉可以刷新</span>');
				contentobj.find('img').css({'-webkit-transition':'all 0.5s ease-in-out'});
				divobj.prepend(contentobj);
				pos.topx = pos.curposx;
				pos.topy = pos.curposy;
			}
			if(!status) {
				return;
			}
			if(status == true) {
				var pullheight = pos.curposy - pos.topy;
				if(pullheight >= 0 && pullheight < 150) {
					divobj.css({'height': pullheight/2 + 'px'});
					contentobj.css({'top': (-30 + pullheight/2) + 'px'});
					if(reloadflag) {
						contentobj.find('img').css({'-webkit-transform':'rotate(180deg)', '-moz-transform':'rotate(180deg)', '-o-transform':'rotate(180deg)', 'transform':'rotate(180deg)'});
						contentobj.find('#refreshtxt').html('下拉可以刷新');
					}
					reloadflag = false;
				} else if(pullheight >= 150) {
					divobj.css({'height':pullheight/2 + 'px'});
					contentobj.css({'top': (-30 + pullheight/2) + 'px'});
					if(!reloadflag) {
						contentobj.find('img').css({'-webkit-transform':'rotate(360deg)', '-moz-transform':'rotate(360deg)', '-o-transform':'rotate(360deg)', 'transform':'rotate(360deg)'});
						contentobj.find('#refreshtxt').html('松开可以刷新');
					}
					reloadflag = true;
				}
			}
			e.preventDefault();
		})
		.on('touchend', function(e) {
			if(status == true) {
				if(reloadflag) {
					contentobj.html('<img src="icon_load.gif" style="vertical-align:middle;margin-right:5px;">正在加载...');
					contentobj.animate({'top': (-30 + 75) + 'px'}, 618, 'linear');
					divobj.animate({'height': '75px'}, 618, 'linear', function() {
						window.location.reload();
					});
					return;
				}
			}
			divobj.remove();
			divobj = null;
			status = false;
			pos = {};
		});
	}
};
function mygetnativeevent(event) {
	while(event && typeof event.originalEvent !== "undefined") {
		event = event.originalEvent;
	}
	return event;
};
$(document).ready(function() {
	//console.log($('.pullrefresh').length)
	if($('.pullrefresh').length > 0) {
		pullrefresh.init();
	}
});

然后在需要用到下拉刷新功能的页面加上：

<div class="pullrefresh" style="display:none;"></div>

OK，大功告成！对了，别忘了jquery