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<script>

</body>

<script src="script/file1.js"></script>  
<script src="script/file2.js"></script>  
<script src="script/file3.js"></script>

<script src="script/?file1&file2&file3"></script>

<?php  
// fetch JavaScript files to compress  
// 得到JS文件名
$jsfiles = array_keys($_GET);  
$js = '';       // code to compress  
$jscomp = '';           // compressed JS  
$err = '';          // error string

// fetch JavaScript files  
// 读取所有的JS文件内容，并且合并到一起。
// 如果出错，就记录下文件名。
for ($i = 0, $j = count($jsfiles); $i < $j; $i++)   
{  
  $fn = $jsfiles[$i] . '.js';  
  $jscode = @file_get_contents($fn);  
  if ($jscode !== false) {  
    $js .= $jscode . "\n";  
  }  
  else {  
    $err .= $fn . '; ';  
  }  
}

if ($err != '') {  
  // error: missing files  
  // 如果出错的话，就返回如下的JS。提醒开发者。
  $jscomp = "alert('The following JavaScript files   
could not be read:\\n$err');";  
}

else if ($js != '') {  
  // REST API arguments  
  $apiArgs = array(  
    'compilation_level'=>'ADVANCED_OPTIMIZATIONS',   //优化度
    'output_format' => 'text',  		     
    'output_info' => 'compiled_code'  
   );  
	//$js 就是所有的JS代码的合体
   $args = 'js_code=' . urlencode($js);  
	//把它们拼到一起,一定很长。
   foreach ($apiArgs as $key => $value) {  
     $args .= '&' . $key .'='. urlencode($value);  
   }

// API call using cURL  
  $call = curl_init();  
  curl_setopt_array($call, array(  
    CURLOPT_URL =>   
'http://closure-compiler.appspot.com/compile',  
    CURLOPT_POST => 1,  
    CURLOPT_POSTFIELDS => $args,  
    CURLOPT_RETURNTRANSFER => 1,  
    CURLOPT_HEADER => 0,  
    CURLOPT_FOLLOWLOCATION => 0  
  ));  
	//$jscomp 就是返回的压缩之后的JS代码
  $jscomp = curl_exec($call);  
  curl_close($call);

} //end of if-else 
 
// output content   
header('Content-type: text/javascript');   
echo $jscomp;   
?>

<script src="script/?file1&file2&file3=1.1.11"></script>