javascript - 将 PHP 变量传递给 Javascript 不起作用

Question

我正在尝试将 php 变量传递给 javascript，但它似乎不起作用。我知道它只适用于 javascript，只是当我尝试用 PHP 传递它时它不起作用。我做错了什么？

<?php

$sayIt = "Hello";

echo "
<script type = 'text/javascript'>

var msg = new SpeechSynthesisUtterance($sayIt);
window.speechSynthesis.speak(msg);

</script>
";

?>

Answer 1

它不起作用，因为 PHP 会像这样解释代码:

<script type = 'text/javascript'>

var msg = new SpeechSynthesisUtterance(Hello);
window.speechSynthesis.speak(msg);

</script>

然后 JavaScript 会将 Hello 视为一个变量，JavaScript 中可能没有定义该变量，你可以这样写:

echo "<script type = 'text/javascript'>

var msg = new SpeechSynthesisUtterance(\"$sayIt\");

window.speechSynthesis.speak(msg);

";

那么它会被解释为:

<script type = 'text/javascript'>

var msg = new SpeechSynthesisUtterance("Hello");
window.speechSynthesis.speak(msg);

</script>

希望对您有帮助!