window.onload = function () vs window.onload= 的区别

Question

Hello I have an aspx document, at the bottom of the page I have this code:

<script language="javascript" type="text/javascript">
      window.onload = migrate();
</script>

It works well, but it does a flickering in the page. The flickering is because I use a translation system... But if I put:

   <script language="javascript" type="text/javascript">
     window.onload = function () {
            migrate();
        }
    </script>

The flickering dissapear.

What is the difference?

Thanks!

Answer 1

In the first code snippet, you are calling the migrate() function and assigning it the value returned from window.onload . (Assuming migrate() returns a function object).

In the second code snippet, you are defining the onload function which in turn will call the migrate() method.