查看这个简单的购物车演示：

http://plnkr.co/edit/CHt2iNSRJAJ6OWs7xmiP?p=preview

用户可以选择蔬菜和水果，并将其添加到购物车阵列中。添加水果/蔬菜的功能非常相似，我想将其组合为可以在两个组件之间共享的功能。

    selectFruit: function(product){
       var cart = this.cart
       for(p in cart){
       if (cart[p]["type"] == "fruit"){
           console.log("We already got a fruit!, Let's remove " + cart[p]["name"] + " and add in " + product["name"]);
              this.cart.$remove(cart[p])
             }
            }
            console.log("Adding " + product.name + " to cart.");
            var productName = product.name
            var cartFruit = {name: product.name, type: 'fruit'}
            this.cart.push(cartFruit)
}

selectVeggie: function(product){
    var cart = this.cart
    for(p in cart){
        if (cart[p]["type"] == "veggie"){
           console.log("We already got a veggie!, Let's remove " + cart[p]["name"] + " and add in " + product["name"]);
           this.cart.$remove(cart[p])
        }
    }
    console.log("Adding " + product.name + " to cart.");
    var productName = product.name
    var cartVeggie = {name: product.name, type: 'veggie'}
    this.cart.push(cartVeggie)
}

我该如何做才能更改此方法并使其在全球范围内使用？我正在与此项目一起使用Vue路由器，谢谢您的帮助！