“Ctrl+/”
“F11/ESC”
<!DOCTYPE html>
<html>
<body>
<div ng-app="" ng-init="quantity=1;cost=5">
<p>总价: <span ng-bind="quantity * cost"></span></p>
</div>
<script src="https://apps.bdimg.com/libs/angular.js/1.3.9/angular.min.js"></script>
</body>
</html>