Syntax error: missing ) after the argument list?

<button id="btn" onclick="download(http://imageurl) value ="download"><button>    


<script>
  function download(url){
 console.log(url);
var link = document.createElement('a');
              link.href = url;
              link.download = "image.jpg";
              document.body.appendChild(link);
              link.click();}
</script>

Syntax error: ) missing after the argument list?

Answer

You are missing quotes in the HTML. Both the close ” for the onclick attribute, and you need to wrap your parameter in single quotes to make it a string:

<button id="btn" onclick="download('http://imageurl')" value ="download"><button>