Angular.js：如何使用ng-bind显示concat。 数组的元素作为字符串？

Question

I am new to Angular and have a basic question about ng-bind that I couldn't find in the documentation. My scenario is based the shopping cart app in the O'Reily Angular.js book and I cannot seem to get ng-bind to work.

Desired output: I need to modify my controller function so I can show my updated $scope.items array elements in a 'Grand Total' span.

Here is the function:

 function CartController($scope) {
    $scope.items = [
      {title: 'Software', quantity: 1, price: 1399.95},
      {title: 'Data Package (1TB)', quantity: 1, price: 719.95},
      {title: 'Consulting (per hr.)', quantity: 1, price: 75.00}
    ];

    $scope.remove = function(index) {
      $scope.items.splice(index, 1);
    },

    $scope.reset = function(index) {
      $scope.items = [
      {title: 'Software', quantity: 0, price: 1399.95},
      {title: 'Data Package (1TB)', quantity: 0, price: 719.95},
      {title: 'Consulting (per hr.)', quantity: 0, price: 75.00}
    ];

    };
} 

Answer 1

I would recommend making a grandTotal function on your $scope and then binding that, like this:

http://jsfiddle.net/XMTQC/

HTML

<div ng-app ng-controller="CartController">
    Grand Total: <span>{{grandTotal()}}</span>
    <br/>
    Grand Total: <span ng-bind="grandTotal()"></span>
    <br/>
</div>

JavaScript

$scope.grandTotal = function () {
    return $scope.items.reduce(function (p, c) {
        return p.price || p + c.price;
    });
};

You can also use interpolation (instead of ngBind ) as indicated in the first span.