php动态创建js

js.php

<?php

echo ‘

<script type="text/javascript">

function addScript(){

var script = document.createElement("script");

script.setAttribute("type","text/javascript");

script.setAttribute("src","123.js");

var hd = document.getElementsByTagName("head")[0];

hd.appendChild(script);

}

</script>‘;

?>

123.js

alert("addddddddddd");