我有以下for循环，当我使用splice()删除一个项目时，我得到'seconds'是未定义的。我可以检查它是否未定义，但我觉得可能有一种更优雅的方式来做到这一点。他们的愿望是简单地删除一个项目，然后继续前进。
for (i = 0, len = Auction.auctions.length; i < len; i++) {
auction = Auction.auctions[i];
Auction.auctions[i]['seconds'] --;
if (auction.seconds < 0) {
Auction.auctions.splice(i, 1);
}
}
当前回答
当您执行.splice()时，数组正在重新索引，这意味着当一个索引被删除时，您将跳过一个索引，并且缓存的.length已过时。
要修复它，你要么需要在.splice()后面递减i，要么简单地反向迭代…
var i = Auction.auctions.length
while (i--) {
...
if (...) {
Auction.auctions.splice(i, 1);
}
}
这样，重新索引就不会影响迭代中的下一项，因为索引只影响从当前点到数组末尾的项，并且迭代中的下一项低于当前点。
其他回答
Auction.auctions = Auction.auctions.filter(function(el) {
return --el["seconds"] > 0;
});
尝试在循环时将数组中继到newArray:
var auctions = Auction.auctions;
var auctionIndex;
var auction;
var newAuctions = [];
for (
auctionIndex = 0;
auctionIndex < Auction.auctions.length;
auctionIndex++) {
auction = auctions[auctionIndex];
if (auction.seconds >= 0) {
newAuctions.push(
auction);
}
}
Auction.auctions = newAuctions;
下面是另一个正确使用拼接的例子。本例将从'array'中删除'attribute'。
for (var i = array.length; i--;) {
if (array[i] === 'attribute') {
array.splice(i, 1);
}
}
举两个例子:
一个例子
// Remove from Listing the Items Checked in Checkbox for Delete
let temp_products_images = store.state.c_products.products_images
if (temp_products_images != null) {
for (var l = temp_products_images.length; l--;) {
// 'mark' is the checkbox field
if (temp_products_images[l].mark == true) {
store.state.c_products.products_images.splice(l,1); // THIS WORKS
// this.$delete(store.state.c_products.products_images,l); // THIS ALSO WORKS
}
}
}
两个例子
// Remove from Listing the Items Checked in Checkbox for Delete
let temp_products_images = store.state.c_products.products_images
if (temp_products_images != null) {
let l = temp_products_images.length
while (l--)
{
// 'mark' is the checkbox field
if (temp_products_images[l].mark == true) {
store.state.c_products.products_images.splice(l,1); // THIS WORKS
// this.$delete(store.state.c_products.products_images,l); // THIS ALSO WORKS
}
}
}
另一个简单的方法是一次消化数组元素:
while(Auction.auctions.length){
// From first to last...
var auction = Auction.auctions.shift();
// From last to first...
var auction = Auction.auctions.pop();
// Do stuff with auction
}
