## Boolean setting.edit.drag.isCopy

### Overview[ depends on jquery.ztree.exedit js ]

When drag-drop node, set whether to allow to copy node. It is valid when [setting.edit.enable = true]

Default: true

### Rules Description

1. If isCopy = true and isMove = true, when drag-drop node, press Ctrl-Key or Cmd-key can copy node, don't press Ctrl-Key or Cmd-key can move node.

2. If isCopy = true and isMove = false, when drag-drop node, will copy node.

3. If isCopy = false and isMove = true, when drag-drop node, will move node.

4. If isCopy = false and isMove = false, so disable to drag-drop node.

### Examples of setting

#### 1. all of the drag-drop operation will copy node.

    var setting = {
    	edit: {
    		enable: true,
    		drag: {
    			isCopy: true,
    			isMove: false
    		}
    	}
    };
    ......