dtoqemais553654797 2014-03-27 05:58
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为什么php变量无法使用javascript循环？

I expected that the number will increase on every alert, but it ended up being the same number which is 0.

Can I know why ?

I need to do this because in my real code, $wow represent the value I retrieved from server and I need to use javascript for loop to count the number element which I targeted.

How can i do this ?

Here is my Code : 

<html>
<head>
<script>
<?php $wow = 0; ?>
for(var i =0; i < 4; i++){
   alert("<?php echo $wow; ?>");
    <?php $wow++; ?>
    }
</script>
<body>
</body>
</html>
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3条回答 默认 最新

  • duanpiao6679 2014-03-27 06:04
    关注

    PHP is executed on the server side, JavaScript on the client side.

    The way it works is like this:

    1. browser makes request
    2. server receives request
    3. server executes PHP
    4. server sends response/HTML
    5. browser receives response/HTML
    6. browser parses HTML / executes JS.

    Just have a look at the document source in the browser, there is no PHP in there because it was already executed (on the server).

    What you can do instead is inject the value of the PHP variable into the JavaScript source code and manipulate the value with JavaScript:

    var wow = <?php echo $wow; ?>
for(var i =0; i < 4; i++){
  alert(wow);
  wow++;
}

    See also

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