How to inject a JavaScript function and its call from text area? [closed]

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How can I submit a function definition and its call from

<input type="text">

tag?

EDIT: My friend have written a php script where he takes the value of tag and without calling strip_tags function prints on another page. Now 开发者_StackOverflow中文版I want to show an example with JavaScript (I believe it should be possible) that I can inject a JavaScript code into his website. That is my task.

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If you want to invoke script from your textbox, try to use eval in javascript.

<script type="text/javascript">
    function Invoke()
    {
        var ctrl = document.getElementById('content')
        eval(ctrl.value);
    }
</script>

<input type="text" id="content" />
<input type="button" onclick="Invoke()" value="Invoke" />

Code: http://jsfiddle.net/AuPRM/

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Assign the return value of yourFunction.toString() to the value property of the field.