How does page javascript get the value passed to the page in the background?

This article will introduce you to the method of page javascript to obtain the value passed to the page in the background. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

<script type="text/javascript">
var state = ${state};
alert(state);
 </script>

[Recommended learning: javascript advanced tutorial]

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