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Can I run my own javascript code in a browser when viewing a page?
For example I have page index.html. In that I want to run this javascript function
function myFunction()
{
alert("Say Hi");
}
I want to call this function through some browser interface because I don’t have access to the source code of the web.
Yes. Just how depends on which browser you’re using:
For Chrome and Safari you’ll use the built-in Web Inspector—see the instructions on this page.
Firefox has the built-in Web Console, but the more advanced add-on Firebug is very popular.
The Internet Explorer equivalent is Developer Tools, which you can launch with F12.