JSON跨域调用与动态脚本加载
下面是在anyjs中JSON跨域的实现（JSONP），原理很简单，动态生成script标签，没有使用到callback（可支持），需要与后台协调保持对象一致，anyjs默认采用JSONP。
01 anyjs.gjsonp=function(url,callbackfn){
02 var h=document.getElementsByTagName(‘head’)[0];
03 var s=anyjs.create(‘script’);
04 anyjs(s).set(‘type’, ‘text/javascript’).set(‘src’, url);
05 anyjs(h).apd(s);
06 if(anyjs.ie){ //IE6+
07 s.onreadystatechange = function () {
08 if (s.readyState == ‘loaded’ || s.readyState == ‘complete’) {
09 (callbackfn)(JSONP);
10 JSONP=null;
11 anyjs(s).rmv();
12 }
13 }
14 } else {//GECKOS、WEBKIT、ETC..
15 s.onload = function() {
16 (callbackfn)(JSONP);
17 JSONP=null;
18 anyjs(s).rmv();
19 }
20 }
21 return false;
22 };//end
02 var h=document.getElementsByTagName(‘head’)[0];
03 var s=anyjs.create(‘script’);
04 anyjs(s).set(‘type’, ‘text/javascript’).set(‘src’, url);
05 anyjs(h).apd(s);
06 if(anyjs.ie){ //IE6+
07 s.onreadystatechange = function () {
08 if (s.readyState == ‘loaded’ || s.readyState == ‘complete’) {
09 (callbackfn)(JSONP);
10 JSONP=null;
11 anyjs(s).rmv();
12 }
13 }
14 } else {//GECKOS、WEBKIT、ETC..
15 s.onload = function() {
16 (callbackfn)(JSONP);
17 JSONP=null;
18 anyjs(s).rmv();
19 }
20 }
21 return false;
22 };//end
使用anyjs跨域调用示例：
01 //JSONP跨域测试开始
02 $(“#jsonp”).click(function(){
03 y=$.create(“div”);
04 $(y).set(“id”,“bglay”).set(“class”,“bglay”);
05 $(“body”).ist(y);
06 x=$.create(“div”);
07 $(x).set(“id”,“ajax”);
08 $(x).set(“class”,“ajax”);
09 $(“body”).ist(x);
10 $(“#ajax”).show();
11 $.gjsonp(“http://www.focusstudio.org/data.php?type=jsonp”,function(data){
12 var arr=[],str=“”;
13 for(var i=0;i<data.length;i++){
14
15 arr.push(data[i].a);
16 str+=data[i].b+“|”;
17 }
18 $(“#ajax”).h(arr.join(“‘”)+str);
19 });
20
21 $(“#ajax”).click(function(){$(“div.bglay”,“#ajax”).fout();$(“div.bglay”,“#ajax”).rmv();});
22 });
23 //跨域jsonp测试结束
02 $(“#jsonp”).click(function(){
03 y=$.create(“div”);
04 $(y).set(“id”,“bglay”).set(“class”,“bglay”);
05 $(“body”).ist(y);
06 x=$.create(“div”);
07 $(x).set(“id”,“ajax”);
08 $(x).set(“class”,“ajax”);
09 $(“body”).ist(x);
10 $(“#ajax”).show();
11 $.gjsonp(“http://www.focusstudio.org/data.php?type=jsonp”,function(data){
12 var arr=[],str=“”;
13 for(var i=0;i<data.length;i++){
14
15 arr.push(data[i].a);
16 str+=data[i].b+“|”;
17 }
18 $(“#ajax”).h(arr.join(“‘”)+str);
19 });
20
21 $(“#ajax”).click(function(){$(“div.bglay”,“#ajax”).fout();$(“div.bglay”,“#ajax”).rmv();});
22 });
23 //跨域jsonp测试结束
后台相关代码：
1 <?php
2 header(“Content-Type:application/x-javascript; charset=utf-8″);
3 $callback = isset($_GET['callback']) ? $_GET['callback'] : ‘JSONP’;
4 $json=array(array(‘a’=>‘enimo1jsonp’,‘b’=>‘test1jsonp’),array(‘a’=>‘enimo2′,‘b’=>‘test2jsonp’));
5 echo ‘var ‘.$callback.‘=’.json_encode($json);
6 ?>
2 header(“Content-Type:application/x-javascript; charset=utf-8″);
3 $callback = isset($_GET['callback']) ? $_GET['callback'] : ‘JSONP’;
4 $json=array(array(‘a’=>‘enimo1jsonp’,‘b’=>‘test1jsonp’),array(‘a’=>‘enimo2′,‘b’=>‘test2jsonp’));
5 echo ‘var ‘.$callback.‘=’.json_encode($json);
6 ?>
到这里，要实现动态加载js脚本，我想大家应该不言自明了吧。
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2010年05月27日 8:49 上午 | #1