AngularJS Example

HTML

<div data-ng-app>
    单价： <input type="number" min=0 ng-model="price" ng-init="price = 299">
    <br>
    数量： <input type="number" min=0 ng-model="quantity" ng-init="quantity = 1">
    <br>
    总价： {{ quantity * price }}
</div>