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当代码里面出现很多if和return的时候我这种小白菜是要抓狂的。。
有些前端效果在dom的事件处理上比较啰嗦,而公司的framework乃至browser也总是出一些奇特的现象。。
于是bug出现了,改着改着就不淡定了。。
事实证明必须淡定,不淡定你永远没能力!
首先把自己写的代码逐一检查,必要时jshint发现一些语法上不规范的地方,比如循环内部不该干的事(= =;;)
然后把整体划分为各个功能性逻辑,比如计数是否准确?是否有必要阻挡冒泡?
如果确认了每部分代码都是正确的而结果不正确,那一定是时序出了问题。
如果时序也没有问题,可是事件的响应有些失控。。必要时下一些不太干净的狠手段,比如加flag。。
下面我模拟drag事件的时候就用一个flag阻断了多余的touchmove,在touchstart时还原。
否则我每拖一次,touchmove响应N多次,次数还不一定。
很难判断是用框架绑定时间的问题,还是其他问题。
一时得不到解决,或者说根本没人来解决,只有自己屏蔽了。
itu.xcontrol.define("tabMain", { views: ["tabMain.html"], _fnOnTouchStart: null, _fnOnTouchMove: null, _fnOnTouchEnd: null, _touchStartPosX: null, _touchStartPosY: null, constructor: function() { try { var me = this; me._fnOnTouchStart = iAuto.Util.bind(me, me._onTouchStart); me._fnOnTouchMove = iAuto.Util.bind(me, me._onTouchMove); me._fnOnTouchEnd = iAuto.Util.bind(me, me._onTouchEnd); } catch (e) { iAuto.Logger.error(e.stack); } }, config: { }, titles: ".titles", divs: "#tabMain_div", press: "pressed", left: "fromleft", right: "fromright", pop: "#tabMain_popularlist1", channel: "#tabMain_channelslist1", playlist: "#tabMain_playlists1", CUR: 1, tabs: ".tabs", TAB: "#tabMain_tabs", NONE: "none", isdoing: "false", onCreate: function() { this.setView("tabMain.html", {}); }, _createCmp_: function() { itu.xcontrol.create(‘popularList‘, ‘tabMain_popularlist1‘, {}); itu.xcontrol.create(‘channelsList‘, ‘tabMain_channelslist1‘, {}); itu.xcontrol.create(‘playLists‘, ‘tabMain_playlists1‘, {}); }, _bindEvent_: function() { var me = this; itu.event.addListener(‘tabMain_popularlist1‘, { ‘name‘: ‘popularList_pressed‘, ‘callback‘: me.on_tabMain_popularlist1_popularList_pressed, ‘context‘: me }); itu.event.addListener(‘tabMain_channelslist1‘, { ‘name‘: ‘channelsList_pressed‘, ‘callback‘: me.on_tabMain_channelslist1_channelsList_pressed, ‘context‘: me }); itu.event.addListener(‘tabMain_playlists1‘, { ‘name‘: ‘playList_pressed‘, ‘callback‘: me.on_tabMain_playlists1_playList_pressed, ‘context‘: me }); }, bindEvents: function() { try { var me = this; var $el = me.$element; var $titles = $el.find(me.titles); var $tab = $el.find(me.tabs); $tab.bind(‘touchstart‘, me._fnOnTouchStart); $tab.bind(‘touchmove‘, me._fnOnTouchMove); $tab.bind(‘touchend‘, me._fnOnTouchEnd); itu.event.on($titles, "touchstart", me.animateIn, me); itu.event.on($titles, "touchend", me.triggerTitles, me); for (var i = 1; i < 4; i++) { $(me.divs + i).attr("data-num", i); } } catch (e) { iAuto.Logger.error(e.stack); } }, unbindEvents: function() { try { var me = this; var $el = me.$element; var $titles = $el.find(me.titles); var $tab = $el.find(me.tabs); $tab.unbind(‘touchstart‘); $tab.unbind(‘touchmove‘); $tab.unbind(‘touchend‘); itu.event.off($titles, "touchstart"); itu.event.off($titles, "touchend"); } catch (e) { iAuto.Logger.error(e.stack); } }, animateIn: function(evt) { var me = this; var n = parseInt($(evt.target).data("num")); iAuto.Logger.log("[tabMain] num is:::", n); me.activeTitle(n); me.CUR = n; }, triggerTitles: function(evt) { var me = this; var $el = me.$element; var id = $(evt.target).data("num"); $el.trigger("title" + id + "_pressed"); }, onShow: function() { iAuto.Logger.log("[tabMain] onShow"); var me = this; me.bindEvents(); }, onHide: function() { iAuto.Logger.log("[tabMain] onHide"); var me = this; me.unbindEvents(); }, on_tabMain_popularlist1_popularList_pressed: function(evt) { // TODO Auto-generated method stub var me = this, $el = me.$element; var id = evt.data; me.CUR = 1; $el.trigger("popular_pressed", id); }, on_tabMain_playlists1_playList_pressed: function(evt) { // TODO Auto-generated method stub var me = this, $el = me.$element; var id = evt.data; me.CUR = 2; $el.trigger("playlist_pressed", id); }, on_tabMain_channelslist1_channelsList_pressed: function(evt) { // TODO Auto-generated method stub var me = this, $el = me.$element; var id = evt.data; me.CUR = 3; $el.trigger("channel_pressed", id); }, setTitles: function(arr) { var me = this; var titles = arr; for (var i = 0; i < titles.length; i++) { $(me.divs + (i + 1)).html(titles[i] + ‘<div id="" class="span" style=""></div>‘); } }, showPop: function(data) { var me = this; var item = data; var pop = me.getCmp("tabMain_popularlist1"); pop.update(item); $(me.channel).hide(); $(me.playlist).hide(); $(me.pop).show(); }, showChannel: function(data) { var me = this; var item = data; var channel = me.getCmp("tabMain_channelslist1"); channel.update(item); $(me.playlist).hide(); $(me.pop).hide(); $(me.channel).show(); }, showPlaylist: function(data) { var me = this; var item = data; var playlist = me.getCmp("tabMain_playlists1"); playlist.update(item); $(me.channel).hide(); $(me.pop).hide(); $(me.playlist).show(); }, _onTouchStart: function(evt) { try { var me = this; if (evt.touches.length === 1) { me._touchStartPosY = parseInt(evt.touches[0].pageY); me._touchStartPosX = parseInt(evt.touches[0].pageX); evt.stopPropagation(); me.isdoing = false; } } catch (e) { iAuto.Logger.error(e.stack); } }, _onTouchMove: function(evt) { try { var me = this; var $el = me.$element; var currentPositionX = parseInt(evt.touches[0].pageX); var currentPositionY = parseInt(evt.touches[0].pageY); var offsetX = currentPositionX - me._touchStartPosX; var offsetY = currentPositionY - me._touchStartPosY; if (Math.abs(offsetY) > 30) { if (me.scroller !== null) { itu.event.on(me.scroller, "scrollend", me.refreshMore, me); } return; } var isLeft = (Math.abs(offsetY) / Math.abs(offsetX) < 0.33) && offsetX < 0; var isRight = (Math.abs(offsetY) / Math.abs(offsetX) < 0.33) && offsetX > 0; if (isRight) { if (me.isdoing === true) { return; } iAuto.Logger.log("[tabMain] _onTouchMove currentPositionX", currentPositionX); iAuto.Logger.log("[tabMain] _onTouchMove touchStartPosX", me._touchStartPosX); me.CUR--; if (me.CUR < 1) { me.CUR = 3; } $el.trigger("title" + me.CUR + "_pressed"); me.activeTitle(me.CUR); iAuto.Logger.log("[tabMain] go right CUR:::after", me.CUR); me.isdoing = true; } if (isLeft) { if (me.isdoing === true) { return; } iAuto.Logger.log("[tabMain] _onTouchMove currentPositionX", currentPositionX); iAuto.Logger.log("[tabMain] _onTouchMove _touchStartPosX", me._touchStartPosX); me.CUR++; if (me.CUR > 3) { me.CUR = 1; } $el.trigger("title" + me.CUR + "_pressed"); me.activeTitle(me.CUR); iAuto.Logger.log("[tabMain] go left CUR:::after", me.CUR); me.isdoing = true; } } catch (e) { iAuto.Logger.error(e.stack); } }, _onTouchEnd: function(evt) { try { var me = this; if (me.scroller !== null) { itu.event.off(me.scroller, "scrollend"); iAuto.Logger.log("[tabMain] _onTouchEnd scrollend disabled"); } } catch (e) { iAuto.Logger.error(e.stack); } }, refreshMore: function(x, y) { var me = this; var $el = me.$element; var contentHeight = parseInt($(".c-scroller__scroller-content").css("height")); var scrollerHeight = parseInt($(".c-scroller").css("height")); var scrollerMaxY = contentHeight - scrollerHeight; if (y >= scrollerMaxY && scrollerMaxY > 0) { iAuto.Logger.log("[tabMain]:scrollMore loading more contents... "); $el.trigger("loadMore", me.CUR); } else if (y <= 0) { $el.trigger("refresh", me.CUR); iAuto.Logger.log("[tabMain]:scrollMore refreshing more contents... "); } }, activeTitle: function(_n) { var me = this; var $el = me.$element; var n = _n; $el.find(me.titles).removeClass(me.press); $(me.divs + n).addClass(me.press); } });
话说这段代码的初版是很惨不忍睹的。
花了几个小时时间几近绝望,但总算hold住了。
多处参考别人的处理(有些需求或者dom没这么复杂,有些堪称lib高端大气上档次看懂都难)。
总归吸取正能量。。比如用Y和X的比例小于0.33来屏蔽一些斜向滑动。
最后控制出来的效果很满意,很有成就感。
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原文地址:http://www.cnblogs.com/haimingpro/p/5072631.html