我记得我已经遇到过,不过今天又遇到了,而且浪费了大量的时候在上面,甚至怀疑自己写的脚本有问题,花了几乎一个下午来调试这个问题。最后发现是样式导致的…
公司里有很多网页游戏,之前是项目多,抄来抄去,JS代码有的是我写的,有的是其它同事直接从网上下载下来copy进去的,到处都是JQuery的$,我不太愿意看到一个页面为了获取DOM对象(getElementById)以及绑定事件来引用额外的脚本,同时也为了统一。网页游戏大多数都是全屏显示,浏览器可视区域有多大,它就全屏显示在里面,为了避免混乱,写了一个通用的脚本支持用户在缩放浏览器时,当可视区域小于指定的宽、高时出现滚动条(Chrome与IE表现一致)。
但当我拿到浏览器可视的宽、高时,对swf对象设定width、height时,神奇的滚动条就出现了,这不符合预期,抓狂…
然后排查问题,对界面所有的元素、样式都删除掉,然后再进行测试,还是有问题。而当我把获得到的可视区域的宽高均减去4px时就不会有滚动条了!!!但界面明显感觉就不对称了,后来找到问题了。
在网上找到二种解决方法:
1、设置swf对象的display属性,将其设置为block;
2、设置body的字体、行高为0,font-size:0;line-height:0;
第二种方法如果页面有文本节点就需要额外再设定字体及行高了,有点麻烦(不过页游界面一般比较简单,一般不太会有什么文字)
默认swf对象返回的display属性为空
最后附上相关的脚本代码,供有需要的同学参考:
/** * Author [email protected] * Version V1.0 */ var BOJOY_Resize = function() { var inner; var _eventList = []; function bindReady(handler) { var isReady = false; function ready() { if (isReady) return; isReady = true; handler(); } if (document.addEventListener) {//native event document.addEventListener("DOMContentLoaded", function() { document.removeEventListener("DOMContentLoaded", arguments.callee, false); ready(); }, false); } else if (document.attachEvent) {//IE //iframe document.attachEvent("onreadystatechange", function () { if (document.readyState === "complete") { document.detachEvent("onreadystatechange", arguments.callee); ready(); } }); if (document.documentElement.doScroll && typeof window.frameElement === "undefined") { (function () { if (isReady) return; try { // If IE is used, use the trick by Diego Perini // http://javascript.nwbox.com/IEContentLoaded/ document.documentElement.doScroll("left"); } catch (error) { setTimeout(arguments.callee, 0); return; } // and execute any waiting functions ready(); })(); } } // Old browsers if (window.addEventListener) { window.addEventListener('load', ready, false); } else if (window.attachEvent) { window.attachEvent('onload', ready); } else { var fn = window.onload // very old browser, copy old onload window.onload = function() { // replace by new onload and call the old one fn && fn() ready() } } } bindReady(function() { while (_eventList.length) { var fn = _eventList.shift(); fn && fn(); } }); function bindEvent(elem, type, fn) { type = type.replace(/^on/, ''); if (elem.addEventListener) { elem.addEventListener(type, fn, false); } else if (elem.attachEvent) { elem.attachEvent('on' + type, fn); } } function unBindEvent(elem, type, fn) { type = type.replace(/^on/, ''); if (elem.removeEventListener) { elem.removeEventListener(type, fn, false); } else if (elem.detachEvent) { elem.detachEvent('on' + type, fn); } } function getElem(id) { return typeof id === 'string' ? document.getElementById(id) : id; } return inner = { domReady : function(fn) { _eventList.push(fn); }, getEl : getElem, bind : function(id, type, fn) { var elem = getElem(id); bindEvent(elem, type, fn); }, unBind : function(id, type, fn) { var elem = getElem(id); unBindEvent(elem, type, fn); }, init : function(id, minWidth, minHeight, extraWidth, extraHeight, autoScroll) { if (!inner.getEl(id)) { return ; } minWidth = minWidth || 1000; minHeight = minHeight || 600; extraWidth = extraWidth || 0; extraHeight = extraHeight || 0; if (typeof(autoScroll) != 'boolean') { autoScroll = true; } var delayTimer = null; function adjustSize() { var elem = inner.getEl(id); elem.style.display = 'block'; var ua = navigator.userAgent.toLowerCase(); var isStrict = document.compatMode == "CSS1Compat"; var isOpera = /opera/.test(ua); var isIE = !isOpera && /msie/.test(ua); var winWidth = 0, winHeight = 0; if (!isStrict && !isOpera) { winWidth = document.body.clientWidth; } else if (isIE) { winWidth = document.documentElement.clientWidth; } else { winWidth = window.innerWidth; } if (isIE) { winHeight = isStrict ? document.documentElement.clientHeight : document.body.clientHeight; } else { winHeight = window.innerHeight; } window.console && window.console.log('isStrict:', isStrict); window.console && window.console.log('winWidth:', winWidth); window.console && window.console.log('winHeight:', winHeight); var w = winWidth - extraWidth; var h = winHeight - extraHeight; if (autoScroll) { w = Math.max(minWidth, w); h = Math.max(minHeight, h); } elem.style.height = h + 'px'; elem.style.width = w + 'px'; window.console && window.console.log('width:', w); window.console && window.console.log('height:', h); } function delayResize() { if (delayTimer != null) { clearTimeout(delayTimer); delayTimer = null; } delayTimer = setTimeout(function() { adjustSize(); }, 0); } inner.domReady(adjustSize); inner.bind(window, 'load', delayResize); inner.bind(window, 'resize', delayResize); } } }();
使用方法:
BOJOY_Resize.init(swfId, minWidth, minHeight, 固定预留的宽度, 固定预留的高度, 是否需要显示滚动条-Boolean);
*固定预留的宽、高指的页面需要固定显示的内容,它们的宽、高,例如页面左侧有一个游戏攻略,顶部有一个全局提示消息等。上面的脚本支持iframe嵌套
参考链接:
2-3px space below Flash object in Firefox...
Font-size adds extra space when positioning text elements in Opera
Extra 2-3px below Flash object on Firefox