remove event listener

1. A concise explanation of the problem you're experiencing.
I need to remove event listener.

2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.
viewer.canvas.addEventListener("click", function(e){
  setTimeout(function () {
    var table = $(viewer.infoBox.frame).contents().find("table");
    if (table) {
      var url = table.find("tr").last().find("td").text();
  }, 100);
}, false);

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

4. The Cesium version you're using, your operating system and browser.

This is a general JavaScript question, not a Cesium-specific question. Mozilla’s docs are a good resource: