how can I call js files in my typescript html

i'm new in angular 5 and i try to call JS files from my HTML components but the navigator (Google Chrome in my case) cannot execute files,i tried call a simple js file (dirBonjour.js) in my component HTML.where can i put js files ?i need help please and thanks in advance.

here my files:

dirBonjour

<p>produit works!</p><br/><br/><br/><br/>
<h1>this my first 3D object loaded in a page</h1>

<table cellspacing="0" cellpadding="2" >
<tbody> 
<tr>
<script src="assets/dirBonjour.js">

</script>
</tr>
</tbody>

</table>

produitComponent:

<p>produit works!</p><br/><br/><br/><br/>
<h1>this my first 3D object loaded in a page</h1>
<script src="assets/dirBonjour.js"></script>
<table cellspacing="0" cellpadding="2" >
<tbody> 
    <tr>
        <td>visual</td>
        <td>code</td>
        <td>studio</td>

    </tr>
</tbody>

</table>

my js file: dirBonjour.js

alert('bonjouuuuuuuuuuuuuuur');
console.log('heeeeeeeeey');