[英]delete an object of an array without looping all the array
我希望能够从一个数组中删除一个对象,而无需循环所有对象数组,以查看当前数组元素是否具有我要删除的项目的ID。
javascript:
function CBooks() {
this.BooksArray = [];
this.AddBook = function(divID, sContents) {
this.BooksArray.push(new CBook());
pos = this.BooksArray.length - 1;
this.BooksArray[pos].ArrayID = pos;
this.BooksArray[pos].DivID = divID;
this.BooksArray[pos].Contents = sContents;
}
this.DelBook = function(divID) {
this.BooksArray.splice(...);
}
}
function CBook() {
this.ArrayID = 0;
this.DivID = "";
this.Contents = "";
}
我像这样初始化对象:
var oBooks = new CBooks();
我添加一本新书,像这样:
oBooks.AddBook("divBook1", "blahblahblah");
//Creation of the div here
oBooks.AddBook("divBook2", "blehblehbleh");
//Creation of the div here
现在,用户可以在显示每本书的div中单击X按钮,以便删除该书。 因此,X按钮包含:
onclick=oBooks.DelBook(this.id);
现在显然在DelBook(divID)函数中,我可以遍历BooksArray的长度,并查看每个元素的divID是否等于参数和此时的拼接,但我想避免循环。
有什么办法吗?
提前致谢
这样的事情会起作用,但前提是您愿意放弃用于哈希的数组。
您的代码已编辑
function CBooks() {
this.BooksHash = {};
this.AddBook = function(divID, sContents) {
var book = new CBook();
//book.ArrayID = pos; //you don't actually need this anymore using a hash
book.DivID = divID;
book.Contents = sContents;
this.BooksHash[book.DivID] = book;
}
this.DelBook = function(divID) {
delete this.BooksHash[divID];
}
}
function CBook() {
//this.ArrayID = 0; // same here
this.DivID = "";
this.Contents = "";
}
希望能帮助到你
arr.filter(function(item){
Return item.id != idtoremove
});
这将在幕后循环,但使用快速的本机代码且更易于阅读。 如果您确实希望删除O(1),则需要使用某种哈希,这将增加创建和更新数组的额外开销
我这样解决了:
function CBooks() {
this.BooksArray = [];
this.Hashes = {};
this.AddBook = function(divID, sContents) {
this.BooksArray.push(new CBook());
pos = this.BooksArray.length - 1;
this.BooksArray[pos].ArrayID = pos;
this.Hashes[divID] = pos;
this.BooksArray[pos].DivID = divID;
this.BooksArray[pos].Contents = sContents;
}
this.DelBook = function(divID) {
this.BooksArray.splice(this.Hashes[divID], 1);
}
}
function CBook() {
this.ArrayID = 0;
this.DivID = "";
this.Contents = "";
}
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