如何将PHP代码放入JavaScript？

Question

I'm trying to define a value by PHP echo with data received from MySQL.

How to put PHP echo code into JavaScript?

Example:

document.addEventListener("DOMContentLoaded", function(event) {
    var gg1 = new JustGage({
        id: "gg1",
        value: <?php echo 'Hello World!' ?>
        min: 0,
        max: 100,
        title: "Target",

Answer 1

You just missed the quotation around the <?php & semi-colon before ?> ,

document.addEventListener("DOMContentLoaded", function(event) {
    var gg1 = new JustGage({
        id: "gg1",
        value: "<?php echo 'Hello World!'; ?>", // This line is edited
        min: 0,
        max: 100,
        title: "Target",

Answer 2

为了在Javascript或JQuery中使用Php varibale，请像这样调用它们。

var example ="<?php echo date();?>";