博客园_宁静的世界需时越兔http://feed.cnblogs.com/blog/u/38704/rss2011-07-06T03:56:26Z越兔http://www.cnblogs.com/muxrwc/CNBlogs BlogServerhttp://www.cnblogs.com/muxrwc/archive/2011/07/06/2099059.html关于布局拖拽的策略只讨论两种情况一、大小相等元素的拖拽，类似与iphone的图标拖拽其拖拽策略可以用如下规则模拟假设拖拽元素中心点（也可以用鼠标）为p1.拖拽元素与目标元素在同行情况下：p进入目标元素内，根据移动方向插入元素2.非同行情况下：p进入目标元素margin后，p的行号大于目标元素行号，插入到目标元素前面，否则插入到元素后面3.如果以上两条规则都不满足,并且p在父容器内，则插入到父容器末尾关于第二条规则的说明：由于这种布局所有元素只有一个父容器，并且这些元素在父容器内是float:left浮起来的，所以插入顺序要这样二、没有元素在同一行的情况，即Portal Drag实际上上面的拖拽规则2,3就可以适2011-07-06T03:54:00Z2011-07-06T03:54:00Z越兔http://www.cnblogs.com/muxrwc/<div><div>只讨论两种情况</div><p></p><div></div><div>一、大小相等元素的拖拽，类似与iphone的图标拖拽</div><p></p><div></div><div>其拖拽策略可以用如下规则模拟</div><div></div><div>假设拖拽元素中心点（也可以用鼠标）为p</div><div></div><div>1.拖拽元素与目标元素在同行情况下：p进入目标元素内，根据移动方向插入元素</div><p></p><div>2.非同行情况下：p进入目标元素margin后，p的行号大于目标元素行号，插入到目标元素前面，否则插入到元素后面</div><div> </div><p>3.如果以上两条规则都不满足,并且p在父容器内，则插入到父容器末尾</p><div></div><div> </div><p>关于第二条规则的说明：</p><div>由于这种布局所有元素只有一个父容器，并且这些元素在父容器内是float:left浮起来的，所以插入顺序要这样</div><p></p><div></div><div>二、没有元素在同一行的情况，即Portal Drag</div><p></p><div></div><div>实际上上面的拖拽规则2,3就可以适用这个</div><p></p><div>只不过上面的情况，只有一个父容器，而Portal Drag有若干个父容器（根据列数决定）</div><p></p><p></p><div></div><div></div><div>其实还有其它很多策略，比如点在元素内，元素交与元素，点距离最近的元素，等。。。</div><p></p><p></p><div></div><div>关于如何封装实现，以后在写^^</div></div><img src="http://www.cnblogs.com/muxrwc/aggbug/2099059.html?type=1" width="1" height="1" alt=""/><p><a href="http://www.cnblogs.com/muxrwc/archive/2011/07/06/2099059.html" target="_blank">本文链接</a></p>http://www.cnblogs.com/muxrwc/archive/2011/06/14/2080527.html关于ie事件多投内存泄漏的一种简单解法额，这个问题大家应该经常碰到，但也通常都忽略（当然，我也忽略:D不过还是提供一个简单的解决方案。问题如下代码：varbind=function(el,F){el.attachEvent('click',function(){F(el);});};匿名函数[[scope]]有到el的循环引用经过测试，利用scope chain的查找特性可以解决此问题。代码如下：varbind=function(el,F){voidfunction(){varclosure=function(){F(el);};el.attachEvent('click',closure);}()2011-06-14T05:21:00Z2011-06-14T05:21:00Z越兔http://www.cnblogs.com/muxrwc/<div><div>额，这个问题大家应该经常碰到，但也通常都忽略（当然，我也忽略:D</div><p></p><p>不过还是提供一个简单的解决方案。 </p><p></p><div>问题如下代码：</div><div></div><div><div style="background-color: #F5F5F5;border: 1px solid #CCCCCC;padding-left:5px;padding-right:5px;"><div><span style="color: #0000FF;">var</span><span style="color: #000000;"> bind </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">function</span><span style="color: #000000;"> (el, F) {<br /> el.attachEvent(</span><span style="color: #000000;">'</span><span style="color: #000000;">click</span><span style="color: #000000;">'</span><span style="color: #000000;">, </span><span style="color: #0000FF;">function</span><span style="color: #000000;"> () {<br /> F(el);<br /> });<br />};</span></div></div></div><div></div><div>匿名函数[[scope]]有到el的循环引用</div><div></div><div>经过测试，利用scope chain的查找特性可以解决此问题。</div><div></div><div>代码如下：</div><div></div><div><div style="background-color: #F5F5F5;border: 1px solid #CCCCCC;padding-left:5px;padding-right:5px;"><div><span style="color: #0000FF;">var</span><span style="color: #000000;"> bind </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">function</span><span style="color: #000000;"> (el, F) {<br /> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> </span><span style="color: #0000FF;">function</span><span style="color: #000000;"> () {<br /> </span><span style="color: #0000FF;">var</span><span style="color: #000000;"> closure </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">function</span><span style="color: #000000;"> () {<br /> F(el);<br /> };<br /> el.attachEvent(</span><span style="color: #000000;">'</span><span style="color: #000000;">click</span><span style="color: #000000;">'</span><span style="color: #000000;">, closure);<br /> }();<br />};</span></div></div></div><div></div><div>稍微改一下：</div><div></div><div><div style="background-color: #F5F5F5;border: 1px solid #CCCCCC;padding-left:5px;padding-right:5px;"><div><span style="color: #0000FF;">var</span><span style="color: #000000;"> bind </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">function</span><span style="color: #000000;"> (el, type, handler) {<br /> </span><span style="color: #0000FF;">return</span><span style="color: #000000;"> </span><span style="color: #0000FF;">function</span><span style="color: #000000;"> () {<br /> </span><span style="color: #0000FF;">var</span><span style="color: #000000;"> closure </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">function</span><span style="color: #000000;"> () {<br /> </span><span style="color: #0000FF;">return</span><span style="color: #000000;"> handler.apply(el, arguments);<br /> };<br /> </span><span style="color: #0000FF;">return</span><span style="color: #000000; "> el.attachEvent(type, closure);<br /> }();<br />};</span></div></div></div><div></div><div>当然，实际中的事件多投要比这个复杂的多，要考虑扩展事件代理（如mouseenter实际是代理mouseover来模拟的）等各种问题。在此就不多说了。</div></div><img src="http://www.cnblogs.com/muxrwc/aggbug/2080527.html?type=1" width="1" height="1" alt=""/><p><a href="http://www.cnblogs.com/muxrwc/archive/2011/06/14/2080527.html" target="_blank">本文链接</a></p>http://www.cnblogs.com/muxrwc/archive/2011/02/24/1964258.html关于__noSuchMethod__的一个应用。。。不过这东西也只能从ff什么的玩玩= =。。。关于__noSuchMethod__的介绍：http://bbs.51js.com/viewthread.php?tid=78872/***firefoxonly*/varanUnknownMethod=function(v){returnv?{Do:function(){alert(v++);returnthis;}}:{__noSuchMethod__:function(){returnthis;}};};anUnknownMethod().Do().Do();anUnknownMethod(1).Do().Do();2011-02-24T14:45:00Z2011-02-24T14:45:00Z越兔http://www.cnblogs.com/muxrwc/<div><span style="font-family: 'Courier New'; font-size: 13px; "><p style="margin-top: 5px; margin-right: auto; margin-bottom: 5px; margin-left: auto; text-indent: 0px; ">不过这东西也只能从ff什么的玩玩= =。。。</p><p style="margin-top: 5px; margin-right: auto; margin-bottom: 5px; margin-left: auto; text-indent: 0px; "></p><p style="margin-top: 5px; margin-right: auto; margin-bottom: 5px; margin-left: auto; text-indent: 0px; ">关于__noSuchMethod__的介绍：http://bbs.51js.com/viewthread.php?tid=78872</p><p></p><p><div style="background-color: #F5F5F5;border: 1px solid #CCCCCC;padding-left:5px;padding-right:5px;"><div><span style="color: #008000;">/*</span><span style="color: #008000;">*<br /> * firefox only<br /> </span><span style="color: #008000;">*/</span><span style="color: #000000;"><br /></span><span style="color: #0000FF;">var</span><span style="color: #000000;"> anUnknownMethod </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">function</span><span style="color: #000000;"> (v) {<br /> </span><span style="color: #0000FF;">return</span><span style="color: #000000;"> v </span><span style="color: #000000;">?</span><span style="color: #000000;"> {<br /> Do : </span><span style="color: #0000FF;">function</span><span style="color: #000000;"> () {<br /> alert(v</span><span style="color: #000000;">++</span><span style="color: #000000;">);<br /> </span><span style="color: #0000FF;">return</span><span style="color: #000000;"> </span><span style="color: #0000FF;">this</span><span style="color: #000000;">;<br /> }<br /> } : {<br /> __noSuchMethod__ : </span><span style="color: #0000FF;">function</span><span style="color: #000000;"> () {<br /> </span><span style="color: #0000FF;">return</span><span style="color: #000000;"> </span><span style="color: #0000FF;">this</span><span style="color: #000000;">;<br /> }<br /> };<br />};<br /><br />anUnknownMethod().Do().Do();<br />anUnknownMethod(</span><span style="color: #000000;">1</span><span style="color: #000000;">).Do().Do();</span></div></div></p></span></div><div></div><img src="http://www.cnblogs.com/muxrwc/aggbug/1964258.html?type=1" width="1" height="1" alt=""/><p><a href="http://www.cnblogs.com/muxrwc/archive/2011/02/24/1964258.html" target="_blank">本文链接</a></p>http://www.cnblogs.com/muxrwc/archive/2011/01/13/1934379.htmlDOMContentLoaded与interactiveDOMContentLoaded与interactive2011-01-13T03:15:00Z2011-01-13T03:15:00Z越兔http://www.cnblogs.com/muxrwc/<p>ie中inline script执行时竟然第一次进入页面,doc.readyState是interactive.刷新则是loading</p><p>interactive也就算了,竟然没有把dom树构建好,也没有body...</p><p>而在inline的脚本里跑计时器什么的,去doc.body.doScroll('left');则有可能碰到interactive时dom树构建好的情况.</p><p>而其它浏览器inline script执行时则为loading...</p><p></p><p>另外，在DOMContentLoaded事件中，doc.readyState多为interactive(opera有时会碰到complete)。</p><p>然后 DOMContentLoaded 时里在注册 DOMContentLoaded 事件则不会被触发(这是当然的= =#)。</p><p>不过即使不在DOMContentLoaded里注册这个事件也有可能碰到interactive时注册了事件，这样就不会触发了。</p><p></p><p>一般的库，架子，都会默认自己注册个DOMContentLoaded事件，然后调用它注册这个事件，都从这个入口里执行，所以倒是不会碰巧在interactive时注册了事件，但也有可能碰到interactive时框架刚刚非同步载入完成，这时用户在注册DOMContentLoaded事件就bug了。。。 </p><img src="http://www.cnblogs.com/muxrwc/aggbug/1934379.html?type=1" width="1" height="1" alt=""/><p><a href="http://www.cnblogs.com/muxrwc/archive/2011/01/13/1934379.html" target="_blank">本文链接</a></p>http://www.cnblogs.com/muxrwc/archive/2010/08/16/1800784.html关于脚本回调关于callback,在某年拜读emu的blog时发现了一种和谐的方案主要解决了回调函数名可配置的问题.并且还实现了强大的错误回调链接如下:http://www.blogjava.net/emu/articles/129240.html主要实现方案是ie用DocumentFragment 或 htmlfile其它浏览器用iframe不过当初测试iframe用伪协议有点兼容问题.后来就换成write...2010-08-16T07:52:00Z2010-08-16T07:52:00Z越兔http://www.cnblogs.com/muxrwc/<p></p>
<p>关于callback,在某年拜读emu的blog时发现了一种和谐的方案</p>
<p>主要解决了回调函数名可配置的问题.<br />并且还实现了强大的错误回调</p>
<p>链接如下:</p>
<p><a href="http://www.blogjava.net/emu/articles/129240.html">http://www.blogjava.net/emu/articles/129240.html</a></p>
<p>主要实现方案是<br />ie用DocumentFragment 或 htmlfile<br />其它浏览器用iframe</p>
<p>不过当初测试iframe用伪协议有点兼容问题.<br />后来就换成write了.</p>
<p>如今在测试发现伪协议src又兼容了= =</p>
<p>不过又发现khtml的浏览器不会带referer</p>
<p>最终测试</p>
<p>frame src为伪协议 都不会带referer</p>
<p>如果frame src先为随意页面a<br />在load时在write或改src为伪协议</p>
<p>sf, chrome 会带 a的url作referer<br />op, ff 会带 调用页的url 作referer</p>
<p>最终代码如下</p>
<p></p>
<div style="background-color: #F5F5F5;border: 1px solid #CCCCCC;padding-left:5px;padding-right:5px;">
<div><!--<br/ /><br/ />Code highlighting produced by Actipro CodeHighlighter (freeware)<br/ />http://www.CodeHighlighter.com/<br/ /><br/ />--><span style="color: #0000ff">var</span><span style="color: #000000"> callbackJS </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">function</span><span style="color: #000000"> () {<br /> <br /> </span><span style="color: #0000ff">var</span><span style="color: #000000"> ua </span><span style="color: #000000">=</span><span style="color: #000000"> navigator.userAgent;<br /><br /> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (</span><span style="color: #000000">/</span><span style="color: #000000">MSIE</span><span style="color: #000000">/</span><span style="color: #000000">.test(ua)) {<br /> </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">function</span><span style="color: #000000"> (param) {<br /> <br /> charset </span><span style="color: #000000">=</span><span style="color: #000000"> param.charset </span><span style="color: #000000">||</span><span style="color: #000000"> </span><span style="color: #000000">'</span><span style="color: #000000">gb2312</span><span style="color: #000000">'</span><span style="color: #000000"><br /><br /> </span><span style="color: #0000ff">var</span><span style="color: #000000"> frag </span><span style="color: #000000">=</span><span style="color: #000000"> document.createDocumentFragment(), script </span><span style="color: #000000">=</span><span style="color: #000000"> frag.createElement(</span><span style="color: #000000">'</span><span style="color: #000000">script</span><span style="color: #000000">'</span><span style="color: #000000">);<br /> script.charset </span><span style="color: #000000">=</span><span style="color: #000000"> charset;<br /> frag[param.name] </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">function</span><span style="color: #000000"> () {<br /> param.callback </span><span style="color: #000000">&&</span><span style="color: #000000"> param.callback.apply(</span><span style="color: #0000ff">null</span><span style="color: #000000">, arguments);<br /> frag </span><span style="color: #000000">=</span><span style="color: #000000"> script </span><span style="color: #000000">=</span><span style="color: #000000"> script.onreadystatechange </span><span style="color: #000000">=</span><span style="color: #000000"> frag[param.name] </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;<br /> };<br /> script.onreadystatechange </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">function</span><span style="color: #000000"> () {<br /> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (script.readyState </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">'</span><span style="color: #000000">loaded</span><span style="color: #000000">'</span><span style="color: #000000">) {<br /> param.errorcallback </span><span style="color: #000000">&&</span><span style="color: #000000"> param.errorcallback();<br /> frag </span><span style="color: #000000">=</span><span style="color: #000000"> script </span><span style="color: #000000">=</span><span style="color: #000000"> script.onreadystatechange </span><span style="color: #000000">=</span><span style="color: #000000"> frag[param.name] </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;<br /> }<br /> };<br /> script.src </span><span style="color: #000000">=</span><span style="color: #000000"> param.url;<br /> frag.appendChild(script);<br /><br /> };<br /><br /> } </span><span style="color: #0000ff">else</span><span style="color: #000000"> {<br /> </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">function</span><span style="color: #000000"> (param) {<br /> <br /> charset </span><span style="color: #000000">=</span><span style="color: #000000"> param.charset </span><span style="color: #000000">||</span><span style="color: #000000"> </span><span style="color: #000000">'</span><span style="color: #000000">gb2312</span><span style="color: #000000">'</span><span style="color: #000000"><br /><br /> </span><span style="color: #0000ff">var</span><span style="color: #000000"> iframe </span><span style="color: #000000">=</span><span style="color: #000000"> document.createElement(</span><span style="color: #000000">'</span><span style="color: #000000">iframe</span><span style="color: #000000">'</span><span style="color: #000000">);<br /> iframe.style.display </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">'</span><span style="color: #000000">none</span><span style="color: #000000">'</span><span style="color: #000000">;<br /> <br /> iframe.callback </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">function</span><span style="color: #000000"> () {<br /> param.callback </span><span style="color: #000000">&&</span><span style="color: #000000"> param.callback.apply(</span><span style="color: #0000ff">null</span><span style="color: #000000">, arguments);<br /> iframe.callback </span><span style="color: #000000">=</span><span style="color: #000000"> iframe.errorcallback </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;<br /> iframe.src </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">'</span><span style="color: #000000">about:blank</span><span style="color: #000000">'</span><span style="color: #000000">, iframe.parentNode.removeChild(iframe), iframe </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;<br /> };<br /> iframe.errorcallback </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">function</span><span style="color: #000000"> () {<br /> param.errorcallback </span><span style="color: #000000">&&</span><span style="color: #000000"> param.errorcallback();<br /> iframe.callback </span><span style="color: #000000">=</span><span style="color: #000000"> iframe.errorcallback </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;<br /> iframe.src </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">'</span><span style="color: #000000">about:blank</span><span style="color: #000000">'</span><span style="color: #000000">, iframe.parentNode.removeChild(iframe), iframe </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;<br /> };<br /> </span><span style="color: #0000ff">try</span><span style="color: #000000"> {<br /> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (</span><span style="color: #000000">/</span><span style="color: #000000">KHTML</span><span style="color: #000000">/</span><span style="color: #000000">.test(ua)) iframe.src </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">'</span><span style="color: #000000">block.htm</span><span style="color: #000000">'</span><span style="color: #000000">; </span><span style="color: #008000">//</span><span style="color: #008000">404可以</span><span style="color: #008000"><br /></span><span style="color: #000000"> iframe.onload </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">function</span><span style="color: #000000"> () {<br /> <br /> iframe.onload </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;<br /> </span><span style="color: #008000">//</span><span style="color: #008000">iframe.src="javascript:\"<scrip"+"t>function " + param.name + "(){frameElement.callback.apply(null, arguments)};<\/scrip"+"t><scrip"+"t src='"+param.url+"'><\/scrip"+"t><scrip"+"t>setTimeout('frameElement.errorcallback()',0)<\/scrip"+"t>\"";</span><span style="color: #008000"><br /></span><span style="color: #000000"> iframe.contentWindow.document.open();<br /> iframe.contentWindow.document.write(<br /> </span><span style="color: #000000">'</span><span style="color: #000000"><script type="text\/javascript">function </span><span style="color: #000000">'</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> param.name </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">'</span><span style="color: #000000">() { frameElement.callback.apply(null, arguments); }<\/script></span><span style="color: #000000">'</span><span style="color: #000000"><br /> </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">'</span><span style="color: #000000"><script type="text\/javascript" src="</span><span style="color: #000000">'</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> param.url </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">'</span><span style="color: #000000">" charset="</span><span style="color: #000000">'</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> charset </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">'</span><span style="color: #000000">"><\/script></span><span style="color: #000000">'</span><span style="color: #000000"><br /> </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">'</span><span style="color: #000000"><script type="text\/javascript">window.setTimeout("try { frameElement.errorcallback(); } catch (exp) {}", 1)<\/script></span><span style="color: #000000">'</span><span style="color: #000000"><br /> );<br /> iframe.contentWindow.document.close();<br /> };<br /> document.body.insertBefore(iframe, document.body.firstChild);<br /> } </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (exp) {}<br /> };<br /> }<br />}();</span></div></div>
<p></p>
<p></p>
<p>不过这样用.<br />又创建了iframe又多了空白页...感觉有点纠结...</p>
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