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href=# vs href=void(0)

无风之雨 — Fri, 17 Nov 2006 04:15:00 GMT

href="#" vs. href="javascript:void(0)"

开发的时候有旉��要用link()来触发一些javascript事�g�Q�所以常常可以看到如下的代码�Q?

"javascript:void(0)" onclick="doSomething();returnfalse;">Link

�q�是一个曾�l�被多次讨论�q�的问题�Q�长期以来，我也一直是�q�样写的。读�?>" src="http://ajaxcn.org/theme/images/Icon-Extlink.png" border="0" />a href=”javascript:void(0);�?�?avoid the void 之后�Q�我认同了作者的意见。下面的写法��实更合理：

"#" onclick="doSomething();returnfalse;">Link

或�?


"#" onclick="return doSomething();">Link

以往大家不��?#"的问题是�Q�这��导致点击链接时��面跛_��面�剙��Q�但通过 return false 语句��得浏览器忽略链接的默认动作，从而避免了此问题�?

youngpup 更有意思，他在>" src="http://ajaxcn.org/theme/images/Icon-Extlink.png" border="0" />How to Create Pop-Up Windows 中言辞激烈的倡导大家永远永远永远不要使用 javascript: 伪协议：

Never, ever, ever use the javascript: pseudo-protocol for anything, ever ever ever ever again. Please. Pretty please.

他的解决�Ҏ��是：

"http://google.com/" 
  onclick="window.open(this.href, 'popupwindow', 
  'width=400,height=300,scrollbars,resizable'); 
  returnfalse;">

�q�样的好处就是可以保存到书签或者收藏夹�Q�可以左键单击，也可以右键��用！

无风之雨 2006-11-17 12:15 发表评论

关于IE无法打开INTERNET站点的错

无风之雨 — Wed, 19 Apr 2006 10:14:00 GMT

        今天新页面上�U�，很多同事报告说页面打开��C��半，�l�常跛_��无法打开Internet站点的错误，然后��面会蟩转到DNS错误的页面�?br />


        �q�个问题我以前遇到过�Q�一直没有详�l�的��L��I�原因，只是以�ؓ是服务器关闭�q�接太快的原因。今天发现这个问题出的很频繁�Q�服务器斚w��没有改什么，只是上传了新的页面程序而已�Q�应该不会和服务器有兟뀂在寚w��面进行分析，�q�搜索了一下网上，发现原来是js在document�q�没完全load完的时候就试图改变其值导致�?br />
        因此对js做如下改变：

原js�Q?br />
     window.settimeout("go()",500);
     function go(){
    .......
     }

�Ҏ��Q?br />
var go_i=window.setInterval("go()",500);
function go(){
   if(document.readyState=="complete"){
      window.clearInterval(go2_i);
    }
    else return;
    ........
}
目的��是让他一定要在document完成后才执行那个操作

无风之雨 2006-04-19 18:14 发表评论

document.domain与域名的问题

无风之雨 — Thu, 13 Apr 2006 03:54:00 GMT

以前如果要��iframe里面的脚本能讉K��parent的内容，但iframe和parent的二�U�域名相同，那一般都会在两者都写上document.domain="xxx.com" 以放宽访问权限�?br />
今天发现�Q�如果iframe和parent在同一个三�U�域名下�Q�比如都是aa.bb.com�Q�那设了document.domain反而会造成讉K��拒绝�?br />
查了下MSDN�Q�有如下解释�Q?br />

Remarks

The property initially returns the host name of the server from which the page is served. The property can be assigned the domain suffix to allow sharing of pages across frames. For example, a page in one frame from home.microsoft.com and a page from www.microsoft.com initially would not be able to communicate with each other. However, by setting the domain property of both pages to the suffix "microsoft.com", you ensure that both pages are considered secure and access is available between the pages.

When you set the domain property, use the domain name determined by the server rather than by the client browser.

All the pages on different hosts must have the domain property explicitly set to the same value to communicate successfully with each other. For example, the value of the domain property of a page on the host microsoft.com would be "microsoft.com" by default. It might seem logical that if you set the domain property of a page on another host named msdn.microsoft.com to "microsoft.com," that the two pages could communicate with each other. However, this is not the case unless you have also explicitly set the domain property of the page on microsoft.com to "microsoft.com".

Furthermore, this property cannot be used to allow cross-frame communication among frames with different domain suffixes. For example, a page in one frame from www.microsoft.com and a page in another frame from www.msn.com would not be able to communicate with each other even if the domain property of both pages was set to the suffix "microsoft.com".

Security Alert Using this property incorrectly can compromise the security of your Web site. Set the domain property only if you must allow cross-domain scripting. Use a value determined on the server. Setting this property to a value determined on the client (like through the location object) could expose your site to attack from another site through Domain Name System (DNS) manipulation. For more information, see Security Considerations: Dynamic HTML.

For more information on domain security, see About Cross-Frame Scripting and Security.

无风之雨 2006-04-13 11:54 发表评论

无风之雨 — Sun, 09 Apr 2006 04:18:00 GMT

我有chm�Q�但那个已经比较老了�Q�最新的�q�是在MSDN�Q�查每个元素的属性方法，style的写法，非常有用

http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/reference/dhtml_reference_entry.asp

无风之雨 2006-04-09 12:18 发表评论

无风之雨 — Sun, 09 Apr 2006 04:15:00 GMT

我做一个网��，原先的设��x��Q�一个页面上有数个DIV�Q�我只显�C�其中一个DIV�Q�其他的隐藏�Q�当我点击页面头部的链接的时候，js把所有DIV都隐藏，然后昄��我点击链接所代表的DIV�?br /> 问题是出来了。当�W�一个DIV昄��后，正在��d��里面的元素，比如囄��的时候，我点��d��部链接，那图片就不会�l�箋��M��Q�就��我切换回来�Q�它也停在那里了�?br /> 原先我以为是隐藏方式的问题，但我用了dislplay和visibility�Q�都一栗��后来同事启发了一下，说以前曾做过一个广告图片，当他点击关闭囄��的链接的时候，会把囄��隐藏�Q�但会导致整个页面上所有的动画都停止的现象�Q�他用的�?lt;a href=# onclick="closeit()">来关的。后来他把href=#��L��了，�q�加上style="cursor:hand"来显�C�手形。这样图片可以隐藏掉�Q�页面也不会有�Q何媄响�?br /> 我照着把头部的链接改了�Q�把原先的href="javascript:showit()"�Ҏ��了onclick�Q�至此问题解除，在我切换到其他DIV的时候，隐藏的DIV会��l�读取页面元素�?br />
我想�Q�出现这�U�情况，可能是因为浏览器把href当作是页面蟩转的语句�Q�就��页面实际上没有转，它也认�ؓ原页面已�l�被跌��{掉了�Q�再��d��上面元素已经没有意义�Q�所以就全部停了�?/p>

无风之雨 2006-04-09 12:15 发表评论