Javascript全局范围不起作用

Question

I'm trying to understand global scoping in js so that i can call a var from a different server into a webpage and access with js, but this simple test is not even working.

remote php script 'remotescript.php' includes:

<script language='javascript' type='text/javascript'>
window.myValue=5;
</script>

Local page includes:

<div class='widget-content'>
<script language='javascript' src='remotescript.php' type='text/javascript'>
</script>
hi!
</div>
<script language='javascript' type='text/javascript'>
alert(window.myValue);
</script>

I get 'undefined' in the alert.

Any clue what I'm doing wrong, or if this should even work?
tyvmia

Answer 1

Update:

Your external script remotescript.php doesn't work because it has <script> tags inside it - you need to remove those and just include the JavaScript code. So in your simple example your remotescript.php should include just the following line:

window.myValue=5;

Or you could use var :

var myValue = 5;

(Note also that you don't need language='javascript' on any of your script elements.)

Original answer from original version of the question:

It won't work if you include JS statements inside a script element that is a link to an external script (this doesn't just apply to creating variables, it applies to any statements). Close the external script and then start a new script element:

<div class='widget-content'>
<script language='javascript' src='http://example.com/files/blockip.php' type='text/javascript'></script>
<script>
var myValue=5;
</script>
hi!
</div>
<script language='javascript' type='text/javascript'>
alert(myValue);
</script>

If you declare globals in the external file that will also work. Multiple scripts can access each other's variables if they are globals.