分享一个discuz touch端的jQuery下拉刷新组件

最近装了个discuz论坛, 趣股VIP吧，发现里面内置的jQuery上拉刷新组件写得还行，STATICURL可以用'http://o9gzet7tk.bkt.clouddn.com/img/',不多说直接上代码

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="'+ STATICURL + '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="'+ STATICURL + '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;
                }
            }                       
                 if(divobj != null)// fixed bugs by Nelson 20160818                    
                 {                       
                     divobj.remove();                        
                 }
            divobj = null;
            status = false;
            pos = {};
        });
    }
};
 
function mygetnativeevent(event) {
 
    while(event && typeof event.originalEvent !== "undefined") {
        event = event.originalEvent;
    }
    return event;
}