update

src/views/home/workspace.vue

@@ -62,9 +62,9 @@ export default {
   created() {
     let random = Math.random();
     getCheckCode({ type: "math", s: random });
-
-    var items = document.getElementsByClassName("ball");
-    //console.log(items)
+  },
+  mounted() {
+    let items = document.getElementsByClassName("ball");
     for (let i = 0; i < items.length; i++) {
       items[i].addEventListener("click", function () {
         console.log(this);