shawl.qiu javascript 跨域类... sqCrossDomain v1.0

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#javascript #function #null #html #iframe #object

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介绍了一种使用JavaScript实现跨域加载的技术，通过动态创建script标签并利用文本文件中定义的JS变量来完成跨域数据传输。

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shawl.qiu 脚本跨域类... sqCrossDomain v1.0

说明:
首先...要声明的是, 实现 js 绝对跨域是不可能的,
不过本类确实实现了跨域.

用 iframe , object 标签, 我是弄过N次了, 还改写了某些方法, 死活就是不行.

最后嘛, 一个常见现象大家可能忽略了.
.js 文件不就是可以跨域使用的么...当然这个就只能用在某些预定内容上了, 但这个对我来说刚好有用.

如果你想实现HTML页跨域, 那应该用服务端技术...不过也可以使用本方法进行跨域, 只是比较麻烦一些, 需要先单独做一个调用页把内容转换成JS内容.

扯正题:
本类要实现的就是从不同域加载某一文件 , 可以是 .js, .txt *.文本文件里加载内容.
内容是一个 js 变量, 变量的内容嘛可就是千变万化了..

原理嘛, 是这样滴:
首先你要确定你有一个文本文件, 里面放着一个 js 变量和其内容.
然后使用 DOM 动态创建 script 标签, 再使用 setInterval 检测那个 js 变量, 如果不为空则加载完毕, 如果超过预定时间, 则显示超时...

看源码吧, 说着累.

shawl.qiu
2007-05-10
http://blog.youkuaiyun.com/btbtd

目录:
1.文本文件 local_playlist1_script.txt
2. 类 sqCrossDomain v1.0

下载:
http://files.myopera.com/btbtd/javascript/sqCrossDomain_v1.0.7z

内容:
1.文本文件 local_playlist1_script.txt

var ScriptText =
"Donna Lewis[I Could Be the One]|"+
"/sqMusicPlayer/mp3/[I Could Be the One][Donna Lewis][blue planet].mp3||"+
"The Cranberries[Never Grow old]|"+
"/sqMusicPlayer/mp3/[Never Grow old][The Cranberries][Wake Up And Smell The Coffee].mp3||"+
"Tomohisa Okudos[Always With Me]|"+
"/sqMusicPlayer/mp3/[Always With Me][Tomohisa Okudo][幸福的味道].mp3||"+
"同船过渡[Love Is... 2]|"+
"/sqMusicPlayer/mp3/[11·Love Is... 2][同船过渡][Unknown].mp3||"+
"Standfase[no longer]|"+
"/sqMusicPlayer/mp3/standfast-nolonger.mp3||"+
"M2M[Pretty Boy]|"+
"/sqMusicPlayer/mp3/[Pretty Boy][M2M][Shades Of Purple].mp3||"+
"Allison Krauss[When You Say Nothin At All]|"+
"/sqMusicPlayer/mp3/[When You Say Nothin At All - A][Allison Krauss][The Other Sister soundtrack].mp3||"+
"Sweet[爱是怎么一回事]|"+
"/sqMusicPlayer/mp3/[爱是怎么一回事(华视舞动奇迹片蝅[Sweet][We ll Go On the Stage].mp3||"
;
//TextGlobal = Text;

2. 类 sqCrossDomain v1.0

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>shawl.qiu template</title>
<script type="text/javascript" id="SptTest">
//<![CDATA[
/*-----------------------------------------------------------------------------------*/
* shawl.qiu sqCrossDomain class v1.0
/*-----------------------------------------------------------------------------------*/
//---------------------------------begin class sqCrossDomain()-------------------------------//
function sqCrossDomain()
{ // shawl.qiu code
//------------------------------------begin public variable
//---------------begin about
this.auSubject = 'shawl.qiu sqCrossDomain class';
this.auVersion = 'v1.0';
this.au = 'shawl.qiu';
this.auEmail = 'shawl.qiu@gmail.com';
this.auBlog = 'http://blog.youkuaiyun.com/btbtd';
this.auCreateDate = '2007-5-10';
//---------------end about
this.Interval = {};
this.Interval.Ms = 100;
this.Interval.Limit = 10000;
this.Interval.Count = 1;
this.Interval.Temp = 0;
this.Interval.Func = null;
this.Script = function(){};
this.Script.Url = "";
this.Script.ID = "SptTextId";
this.Identifier = function(){}
this.Identifier.VariableName = "";
this.Prefix = "SADFkljkjfaksdskkk";
this.CallBack = null;
this.Error = null;
this.Go = fGo;
//------------------------------------end public variable
//------------------------------------begin private variable
var Tl = this;
//------------------------------------end private variable
//------------------------------------begin public method
function fGo()
{
if(!Tl.CallBack)
{
alert("回调函数不能为空!");
return;
} // end if
if(Tl.Script.Url=="")
{
alert("路径不能为空!");
return;
}
var EleHeadSet = document.getElementsByTagName("head");
if(EleHeadSet.length==0)
{
alert("Head 标签不存在, 操作无法进行!");
return;
}
var EleHead = EleHeadSet[0];
var EleSpt = document.createElement("script");
EleSpt.src = Tl.Script.Url;
EleSpt.id = Tl.Script.ID;
EleHead.appendChild(EleSpt);
Tl.Interval.Func =
setInterval
(
function()
{
var sTemp = ""
try
{
sTemp = eval(Tl.Identifier.VariableName);
}
catch(e)
{
sTemp = "";
}
defaultStatus = "空值: "+(sTemp=="")+" | 尝试加载次数: "+Tl.Interval.Count++;
Tl.Interval.Temp += Tl.Interval.Ms;
if(sTemp!="")
{
clearInterval(Tl.Interval.Func);
Tl.CallBack(sTemp);
}
if(Tl.Interval.Temp>=Tl.Interval.Limit)
{
clearInterval(Tl.Interval.Func);
defaultStatus = "加载超时!";
alert("超时");
}
}
,
Tl.Interval.Ms
);
} // end function fGo
function fFunc()
{
}
function fError(sMsg)
{
}
//------------------------------------end public method
//------------------------------------begin private method
//------------------------------------end private method
} // shawl.qiu code
//---------------------------------end class sqCrossDomain()---------------------------------//
var Acd = new sqCrossDomain();
onload =
function()
{
Acd.Interval.Ms = 100;
Acd.Interval.Limit = 10000;
//Acd.Script.Url = "http://127.0.0.1:999/sqMusicPlayer/playlist/local_playlist1_script.txt"
Acd.Script.Url = "http://shawl.qiu.googlepages.com/local_playlist1_script.txt"
//Acd.Script.Url = "http://files.myopera.com/btbtd/sqMusicPlayer/PlayList/local_playlist1_script.txt"
Acd.Script.ID = "SptTextId";
Acd.Identifier.VariableName = "ScriptText";
Acd.CallBack = fCallBack;
Acd.Go();
}
function fCallBack(str)
{
alert(str);
}
//]]>
</script>
</head>
<body>
</body>
</html>