javascript - AngularJS forEach 和添加值

Question

var grandTotal;
angular.forEach($scope.gear, function(value, key) {
    var rowTotal = value.amount * value.price;
    console.log(rowTotal);
    grandTotal += rowTotal; 
});
console.log('grandTotal: '+grandTotal);

我正在尝试获取上述内容的拨款总额，它似乎为我的 grandTotal 返回 NaN

更新:

var grandTotal = 0;
angular.forEach($scope.gear, function(value, key) {
    var rowTotal = value.amount * value.price;
    rowTotal = rowTotal.toFixed(1);
    console.log(rowTotal);
    grandTotal += rowTotal;
});
console.log('grandTotal: '+parseFloat(grandTotal));

这会返回

Answer 1

使用普通的 javascript map 和 reduce 函数怎么样？

基于您的目的的示例:http://jsfiddle.net/optyler/G2ZJa/