关于js的加载顺序

if(isset($_GET[‘js2’])){
        sleep(1);
        echo "alert(‘outer2 js’);";
        exit();
}

if(isset($_GET[‘js’])){
        //sleep(1);
        echo ‘document.write(\'<script src="?js2"></script>\’);’;
        echo "alert(‘outer js’);";
        exit();
}
if($_GET[‘m’] == ‘a’){
        echo ‘<script src="?js"></script>’;
        echo ‘<script> alert("inner js"); </script>’;
} else if($_GET[‘m’] == ‘b’){
        echo ‘<script>document.write(\'<script src="?js"><\/script>\’);alert("inner js");</script>’;
} else if($_GET[‘m’] == ‘c’){
        echo ‘<script>document.write(\'<script src="?js"><\/script>\’);</script><script>alert("inner js");</script>’;
} else {
?>
<script>
var loadScript = function (id, scriptSource, charset) {
        var head = document.getElementsByTagName(‘head’)[0];
        var oldScript = document.getElementById(id);
        if (oldScript) {
                head.removeChild(oldScript);
        }
        var newScript = document.createElement(‘script’);
        if (charset) {
                newScript.charset = charset;
        } else { 
                newScript.charset = ‘gb2312’;
        }
        newScript.id = id;
        newScript.type = ‘text/javascript’;
        newScript.src = scriptSource;
        head.appendChild(newScript);
};
</script>
<?php
        if($_GET[‘m’] == ‘d’) {
                echo ‘<script >loadScript("scriptid","?js");</script>’;
                echo ‘<script> alert("inner js"); </script>’;
        } else if($_GET[‘m’] == ‘e’){
                echo ‘<script >loadScript("scriptid","?js");alert("inner js");</script>’;
        }
}