添加Metronic（作为LFS）

frontend/static/assets/admin/pages/scripts/form-dropzone.js

@@ -0,0 +1,36 @@
+var FormDropzone = function () {
+
+
+    return {
+        //main function to initiate the module
+        init: function () {  
+
+            Dropzone.options.myDropzone = {
+                init: function() {
+                    this.on("addedfile", function(file) {
+                        // Create the remove button
+                        var removeButton = Dropzone.createElement("<button class='btn btn-sm btn-block'>Remove file</button>");
+                        
+                        // Capture the Dropzone instance as closure.
+                        var _this = this;
+
+                        // Listen to the click event
+                        removeButton.addEventListener("click", function(e) {
+                          // Make sure the button click doesn't submit the form:
+                          e.preventDefault();
+                          e.stopPropagation();
+
+                          // Remove the file preview.
+                          _this.removeFile(file);
+                          // If you want to the delete the file on the server as well,
+                          // you can do the AJAX request here.
+                        });
+
+                        // Add the button to the file preview element.
+                        file.previewElement.appendChild(removeButton);
+                    });
+                }            
+            }
+        }
+    };
+}();