how to inject javascript into a website code example

Example 1: inject javascript to webpage

$.ajax({
    url: `chrome-extension://${chrome.runtime.id}/index.html`,
    success: function(data){ 
        //Simple note: the injected id is there so if you wanted to remove the injection you could do that :D
        document.getElementsByTagName('body').innerHTML += "<script id='injected'>" + data + "</script>";
    },
    error: function(err){
        alert(err);
    }
});

Example 2: how to inject javascript into html

<!DOCTYPE html>
<html lang="en-US">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Today's Date</title>
    <script>
        let d = new Date();
        alert("Today's date is " + d);
    </script>
</head>

<body>

</body>



</html>

Tags:

Javascript Example

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