var productMaster=[{id:'A441',name:'Pepsi',category:'Soft Drink', price:15, quantity:2},{id:'B234',name:'Coke', category:'Soft Drink', price:10, quantity:8},{id:'A617',name:'Mirinda', category:'Soft Drink', price:20, quantity:20},{id:'B003',name:'Sprite', category:'Soft Drink', price:16, quantity:5},{id:'B225',name:'Minute Maid', category:'Soft Drink', price:25, quantity:12},{id:'A742',name:'5Star', category:'Chocloate', price:10, quantity:3},{id:'B388',name:'Appy', category:'Soft Drink', price:35, quantity:9},{id:'A899',name:'Gems', category:'Chocloate', price:12, quantity:11},{id:'B635',name:'KitKat', category:'Chocloate', price:15, quantity:7},{id:'B408',name:'Perk', category:'Chocloate', price:8, quantity:15},{id:'A354',name:'Dairy Milk', category:'Chocloate', price:30, quantity:4}];var arr1 = productMaster.filter(n => n.value=n.price*n.quantity && n.value<150);console.log(JSON.stringify(arr1));值定義為價格 * 數量，我得到一個空數組。我必須創建一個包含值小于 150 的所有產品的數組。