title: How to let user choose how many checkboxes can be selected in Element-ui?
body: <p>I'm making a create question page, and would like to let the user creating the question to be able to select how many options need to be selected for the question, like 1 as default and they can choose to let 2 or 3 options be chosen. How can I do this for the Element-ui checkbox component?</p>