我正在尝试创建一个删除客户及其地址的例程，但前提是该地址未附加到客户对象列表中的其他客户。
这是我的代码：
//我的数据
var allData = [
{ type: "store", data: { store_id: 297, name: "Scotiabank - Main Branch",
address_id: 1023 } },
{ type: "store", data: { store_id: 614, name: "Scotiabank - Hamilton",
address_id: 1984 } },
{ type: "store", data: { store_id: 193, name: "Scotiabank - Mississauga",
address_id: 1757 } },
{ type: "customer", data: { customer_id: 26, store_id: 297, first_name:
"Dave", last_name: "Bennett", email: "dbennett@gmail.com", address_id: 4536,
add_date: null } },
{ type: "customer", data: { customer_id: 59, store_id: 193, first_name:
"John", last_name: "Stevens", email: "jstevens22@hotmail.com", address_id:
2473, add_date: null } },
{ type: "customer", data: { customer_id: 29, store_id: 614, first_name:
"Sarah", last_name: "Pym", email: "spym99@hotmail.com", address_id: 1611,
add_date: null } },
{ type: "customer", data: { customer_id: 63, store_id: 297, first_name:
"Steven", last_name: "Edwards", email: "steven2231@hotmail.com", address_id:
1836, add_date: null } },
{ type: "customer", data: { customer_id: 71, store_id: 614, first_name:
"Martin", last_name: "Scott", email: "mdog33@gmail.com", address_id: 2727,
add_date: null } },
{ type: "customer", data: { customer_id: 24, store_id: 614, first_name:
"Jonathan", last_name: "Pym", email: "jjpym@yahoo.ca", address_id: 1611,
add_date: null } },
{ type: "customer", data: { customer_id: 36, store_id: 193, first_name:
"Kaitlyn", last_name: "Adams", email: "katy38@hotmail.com", address_id:
5464, add_date: null } },
{ type: "customer", data: { customer_id: 73, store_id: 297, first_name:
"Melissa", last_name: "Bennett", email: "mbennett@gmail.com", address_id:
4536, add_date: null } },
{ type: "address", data: { address_id: 1023, address: "2895 Yonge St.",
city: "Toronto", province: "ON", postal_code: "L4C02G" } },
{ type: "address", data: { address_id: 1984, address: "3611 Main St.
West", city: "Hamilton", province: "ON", postal_code: "R5O8H5" } },
{ type: "address", data: { address_id: 1757, address: "1177 Ontario St.
Unit 8", city: "Mississauga", province: "ON", postal_code: "L9H6B3" } },
{ type: "address", data: { address_id: 4536, address: "3945 John St.",
city: "Ajax", province: "ON", postal_code: "L7M4T9" } },
{ type: "address", data: { address_id: 2473, address: "391 Baker St. Apt
231", city: "Mississauga", province: "ON", postal_code: "M4T8S3" } },
{ type: "address", data: { address_id: 1611, address: "183 City Ct.",
city: "Hamilton", province: "ON", postal_code: "J3T9V2" } },
{ type: "address", data: { address_id: 1836, address: "67 Rhymer Ave.",
city: "Stouffville", province: "ON", postal_code: "L3C8H4" } },
{ type: "address", data: { address_id: 2727, address: "287 Brant St. Apt
4A", city: "Waterdown", province: "ON", postal_code: "R93G3P" } },
{ type: "address", data: { address_id: 5464, address: "11 New St. Apt
2B", city: "Brampton", province: "ON", postal_code: "L694R7" } },
];
//我的对象
var CustomerDB = {
customers: [],
addresses: [],
stores: [],
insertData: function (allData) {
for (var i = 0; i < allData.length; i++) {
if (allData[i].type == "store") {
this.addStore(allData[i].data);
}
else if (allData[i].type == "customer") {
this.addCustomer((allData[i].data));
}
else if (allData[i].type == "address") {
this.addAddress((allData[i].data));
}
}
},
//加载数据
CustomerDB.insertData(allData);
此removeCustomerById函数完全有效，但removeAddressById：
除外removeCustomerById: function (customer_id) {
var address_id_remove;
for (var i = 0; i < this.customers.length; i++) {
if (this.customers[i].customer_id == customer_id) {
address_id_remove = this.customers[i].address_id;
this.customers.splice(i, 1);
this.removeAddressById(address_id_remove);
}
}
},
// removeAddresById code
removeAddressById: function (address_id) {
for (var i = 0; i < this.addresses.length; i++)
{
if (this.addresses[i].address_id == address_id)
{
if (this.addressExistsInCustomer(address_id))
{
console.log("bout to remove an address " +
this.addresses[i].address_id)
this.addresses.splice(i, 1);
}
}
}
},
// addressExistsInCustomer code
addressExistsInCustomer: function (address_id) {
return this.customers.some(c => c.address_id == address_id)
},
addressExistsInCustomer永远不会返回true，即使它应该返回true。我觉得我忽略了一些愚蠢的东西，需要一双新鲜的眼睛......
先谢谢
答案 0 :(得分：0)
for (var i = 0; i < this.customers.length; i++) {
return (this.customers[i].address_id == address_id)
}
此循环使函数始终在循环的第一次迭代中返回，无论值是true还是false。
您想要做的是：
for (var i = 0; i < this.customers.length; i++) {
if (this.customers[i].address_id == address_id) return true
}
return false
这确保该函数仅在表达式求值为true时（或 ）时返回，并且如果求值为false，则将继续下一次迭代。如果表达式在任何迭代中都没有计算到true，则循环之后的代码将被执行，函数返回false。
答案 1 :(得分：0)
您的方法在第一次迭代时返回。
for (var i = 0; i < this.customers.length; i++) {
return (this.customers[i].address_id == address_id)
} ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
一个好方法是使用函数some
addressExistsInCustomer: function (address_id) {
return this.customers.some(c => c.address_id == address_id)
}
此片段说明了函数some的工作原理，基本上找到了address_id等于传递为param的对象。
var customers = [ { "type": "store", "data": { "store_id": 297, "name": "Scotiabank - Main Branch", "address_id": 1023 } }, { "type": "store", "data": { "store_id": 614, "name": "Scotiabank - Hamilton", "address_id": 1984 } }, { "type": "store", "data": { "store_id": 193, "name": "Scotiabank - Mississauga", "address_id": 1757 } }, { "type": "customer", "data": { "customer_id": 26, "store_id": 297, "first_name": "Dave", "last_name": "Bennett", "email": "dbennett@gmail.com", "address_id": 4536, "add_date": null } }, { "type": "customer", "data": { "customer_id": 59, "store_id": 193, "first_name": "John", "last_name": "Stevens", "email": "jstevens22@hotmail.com", "address_id": 2473, "add_date": null } }, { "type": "customer", "data": { "customer_id": 29, "store_id": 614, "first_name": "Sarah", "last_name": "Pym", "email": "spym99@hotmail.com", "address_id": 1611, "add_date": null } }, { "type": "customer", "data": { "customer_id": 63, "store_id": 297, "first_name": "Steven", "last_name": "Edwards", "email": "steven2231@hotmail.com", "address_id": 1836, "add_date": null } }, { "type": "customer", "data": { "customer_id": 71, "store_id": 614, "first_name": "Martin", "last_name": "Scott", "email": "mdog33@gmail.com", "address_id": 2727, "add_date": null } }, { "type": "customer", "data": { "customer_id": 24, "store_id": 614, "first_name": "Jonathan", "last_name": "Pym", "email": "jjpym@yahoo.ca", "address_id": 1611, "add_date": null } }, { "type": "customer", "data": { "customer_id": 36, "store_id": 193, "first_name": "Kaitlyn", "last_name": "Adams", "email": "katy38@hotmail.com", "address_id": 5464, "add_date": null } }, { "type": "customer", "data": { "customer_id": 73, "store_id": 297, "first_name": "Melissa", "last_name": "Bennett", "email": "mbennett@gmail.com", "address_id": 4536, "add_date": null } }, { "type": "address", "data": { "address_id": 1023, "address": "2895 Yonge St.", "city": "Toronto", "province": "ON", "postal_code": "L4C02G" } }, { "type": "address", "data": { "address_id": 1984, "address": "3611 Main St. West", "city": "Hamilton", "province": "ON", "postal_code": "R5O8H5" } }, { "type": "address", "data": { "address_id": 1757, "address": "1177 Ontario St. Unit 8", "city": "Mississauga", "province": "ON", "postal_code": "L9H6B3" } }, { "type": "address", "data": { "address_id": 4536, "address": "3945 John St.", "city": "Ajax", "province": "ON", "postal_code": "L7M4T9" } }, { "type": "address", "data": { "address_id": 2473, "address": "391 Baker St. Apt 231", "city": "Mississauga", "province": "ON", "postal_code": "M4T8S3" } }, { "type": "address", "data": { "address_id": 1611, "address": "183 City Ct.", "city": "Hamilton", "province": "ON", "postal_code": "J3T9V2" } }, { "type": "address", "data": { "address_id": 1836, "address": "67 Rhymer Ave.", "city": "Stouffville", "province": "ON", "postal_code": "L3C8H4" } }, { "type": "address", "data": { "address_id": 2727, "address": "287 Brant St. Apt 4A", "city": "Waterdown", "province": "ON", "postal_code": "R93G3P" } }, { "type": "address", "data": { "address_id": 5464, "address": "11 New St. Apt 2B", "city": "Brampton", "province": "ON", "postal_code": "L694R7" } }];
var addressExistsInCustomer = (address_id) => {
return this.customers.some(c => c.data.address_id === address_id);
}
console.log(addressExistsInCustomer(1023));
console.log(addressExistsInCustomer(999900));