javascript - 如何在 Javascript 中使用对此的新引用调用父定义的 block

Question

如果我在 JS 中有一个父对象，它有一个 block 保存到一个键，我如何在嵌套对象中调用它并正确引用“this”。

var colors = {
    foo: function () {
         return this.color;
    },

    red: {  
        color: 'red',
        myColor: function () {
            return foo();
        }
    },

    blue: {
        color: 'blue',
        myColor: function () {
            return foo();
        }
    }
};

这就是我所说的

colors.blue.myColor(); 

输出为

"blue"

我使用这个想法的确切上下文是

    var accounts = {
      checking: {
        balance: 0,
        deposit: function (amount) {
            if (amount > 0) {
                this.balance += amount;
            }
        },
        withdraw: function (amount) {
            var tA = accounts.totalAmount();
            if (amount > 0 && amount <= this.balance) {
                this.balance -= amount;
            } else if (tA >= amount) {
                accounts.savings.withdraw(amount - this.balance);
                this.balance = 0;
            }
        }
      },

      savings: {
        balance: 0,
        deposit: function (amount) {
            if (amount > 0) {
                this.balance += amount;
            }
        },
        withdraw: function (amount) {
            var tA = accounts.totalAmount();
            if (amount > 0 && amount <= this.balance) {
                this.balance -= amount;
            } else if (tA > amount) {
                accounts.checking.withdraw(amount - this.balance);
                this.balance = 0;
            }
        }
      },

      totalAmount: function() {
        return accounts.savings.balance + accounts.checking.balance
      }
    };

我想在储蓄和支票之外提取存款功能，而是调用 block 。

Answer 1

您是否尝试过将值传递给 foo()？

var colors = {
    foo: function (t) {
         return t.color;
    },

    red: {  
        color: 'red',
        myColor: function () {
            return colors.foo(this);
        }
    },

    blue: {
        color: 'blue',
        myColor: function () {
            return colors.foo(this);
        }
    }
};

colors.blue.myColor();