问如何让我的提交按钮在不离开当前页面的情况下显示上传的文件

EN

<script>
    var Info = {
    width: 550,
    height: 550,
    serverURL: "http://chemapps.stolaf.edu/jmol/jsmol/jsmol.php ",
    use: "HTML5 WEBGL JAVA",
    j2sPath: "jsmol/j2s",
    script: "load 1BNA.pdb; set spin x 15; set spin y 15; set spin z 15; spin on; 
    wireframe on; spacefill off",
    console: "jmolApplet0_infodiv"
     }
</script>




  <form>
  Select a file: <input type="file" name="usr_file" required>
  <input type="submit" onclick="myFunction(Info)">
  </form>
  <p id="upload"></p>



<script>
function myFunction() {
var x = document.getElementById("Info").required;
document.getElementById("upload").innerHTML = x;
 }
</script>