html - Javascript in separate file not working -

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i'm starting out in javascript, , i'm trying put scripts in separate file. work fine when they're in html file, move them own separate file stops working.

here's html file:

    <!doctype html> <head>     <meta lang = "en">      <link rel="stylesheet" type="text/css" href="css/mainstyle.css">     <script src="js/script1.js"></script>      <title>web dev practice</title> </head>  <body>         <h1>first javascript example</h1>          <button type="button" onclick="changetext()">clickme!</button>          <p id="demo">this test.</p>      </br>     </br>          <h1>second javascript example</h1>          <img id="lightbulb" onclick="changeimage()" src="res/img/pic_bulboff.gif" width="100" height="180">          <p>click light bulb turn on or off.</p>  </body> </html>

and here's js file:

    <script> function changetext(){     var string_first = "this test.";     var string_second = "woah, works!";      if(document.getelementbyid("demo").innerhtml == string_first){         document.getelementbyid("demo").innerhtml = string_second;     } else{         document.getelementbyid("demo").innerhtml = string_first;     }  } 

    <script> function changeimage(){     var image = document.getelementbyid('lightbulb');         if(image.src.match("bulbon")){             image.src = "res/img/pic_bulboff.gif";         }         else{             image.src = "res/img/pic_bulbon.gif";         } }  </script>

the <script> tags html things, not javascript, don't need (and can't have) them in external files. browser using? many have built in console can see errors, if any, page throwing.


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