php调用js的方法是什么？

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PHP调用JS

取值：显示：values;

<html>
<body>
	<script type="text/javascript">
		var str = 'values';
	</script>
	<?php 
		echo "<script type=text/javascript>document.write(str)</script>";
	?>
</body>
</html>

调用函数（方法）弹窗：9

<html>
<body>
	<script type="text/javascript">
		function add(){
			var x = 0;
			x = x + 9;
			alert(x);
		}
	</script>
	<?php 
		echo "<script type=text/javascript>add()</script>";
	?>
</body>
</html>