极客教程Ember.js MutableArray removeObject() 方法
Ember.js 是一个基于 Model-View-Controller (MVC) 架构的开源 JavaScript 框架，用于开发大型客户端 Web 应用程序。Ember.js 是最广泛使用的前端应用程序框架之一。它旨在加快开发速度和提高生产力。目前，许多网站都在使用它，包括 Square、Discourse、Groupon、Linked In、Live Nation、Twitch 和 Chipotle。
removeObject() 方法从数组中移除所有此对象的实例。
语法:
removeObject(obj)
参数：
- obj： 要移除的对象。
返回值： 新数组。
要运行以下示例，您需要一个 Ember 项目。首先，需要安装 ember-cli。在终端中编写以下代码：
npm install ember-cli
现在你可以通过输入以下代码来创建项目：
ember new <project-name> --lang en
要启动服务器，请输入：
ember serve
示例1
输入以下代码生成该示例的路由：
ember generate route party
app/routes/party.js
import Route from "@ember/routing/route";
export default class PartyRoute extends Route {
partyItems = [
"Digital Camera",
"Jugs, cups & straws",
"Balloons",
"Scissors",
"Cold Drink",
"Table Confetti",
"Party Hats",
"Wine",
"Napkins",
"Party Plates",
"Speakers",
"Music System",
"Cups",
];
itemString;
itemList;
start;
end;
helper(itemString) {
this.itemList = itemString.split(",");
for (let i = 0; i < this.itemList.length; i++)
this.itemList[i] = this.itemList[i].trim();
return this.itemList;
}
model() {
return this.partyItems;
}
setupController(controller, model) {
this._super(controller, model);
controller.set("helper", this.helper);
controller.set("partyItems", this.partyItems);
controller.set("itemString", this.itemString);
controller.set("itemList", this.itemList);
controller.set("start", this.start);
controller.set("end", this.end);
}
}
app/controllers/party.js
import Ember from 'ember';
import {
objectsAt, removeObject, removeObjects,
slice, reverseObjects, setObjects, reject
}
from '@ember/array';
export default Ember.Controller.extend({
actions: {
getItems(itemString) {
this.itemList = this.helper(itemString);
for (let i = 0; i < this.itemList.length; i++)
this.itemList[i] = parseInt(this.itemList[i]);
let tempItems =
this.partyItems.objectsAt(this.itemList);
let str = '';
for (let i = 0; i < tempItems.length; i++)
str += tempItems[i] + '\n';
alert(str);
},
removeItems(itemString) {
this.itemList = this.helper(itemString);
if (this.itemList.length == 1)
this.partyItems.removeObject(this.itemList[0]);
else
this.partyItems.removeObjects(this.itemList);
this.set('itemString', '');
},
sliceItems(start, end) {
let tempItems = this.partyItems.slice(start, end);
let str = '';
for (let i = 0; i < tempItems.length; i++)
str += tempItems[i] + '\n';
alert(str);
},
reverseItems() {
this.set('partyItems',
this.partyItems.reverseObjects());
},
replaceItems(itemString) {
this.partyItems.setObjects(this.helper(itemString));
},
findMultiwordItems() {
let reqItem = this.partyItems.reject((item) =>
item.split(' ').toArray().length == 1);
alert(reqItem);
}
},
});
app/template/party.js
{{page-title "Party"}}
<h3>Here is a list of items: </h3>
<ul>
{{#each @model as |party|}}
<li>{{party}}</li>
{{/each}}
</ul>
<br /><br />
<div>
<label>Enter Items: </label>
{{input value=this.itemString}}
</div>
<div>
<input type="button" id="remove-item"
value="Remove Items"
{{action 'removeItems' this.itemString}} />
</div>
<br /><br />
<div>
<label>Enter Start Index: </label>
{{input value=this.start}}
</div>
<div>
<label>Enter End Index: </label>
{{input value=this.end}}
</div>
<div>
<input type="button" id="slice"
value="Slice"
{{action 'sliceItems' this.start this.end}} />
</div>
<br /><br />
<div>
<label>Enter Indices: </label>
{{input value=this.itemString}}
</div>
<div>
<input type="button" id="get-item"
value="Get Items"
{{action 'getItems' this.itemString}} />
</div>
<br /><br />
<div>
<label>Enter Items: </label>
{{input value=this.itemString}}
</div>
<div>
<input type="button" id="replace-item"
value="Replace Items"
{{action 'replaceItems' this.itemString}} />
</div>
<br /><br />
<input type="button" id="reverse-items"
value="Reverse" {{action 'reverseItems' }} />
<br /><br />
<input type="button" id="find-items"
value="Find" {{action 'findMultiwordItems' }} />
{{outlet}}
输出： 访问 localhost:4200/party 查看输出
示例2
输入以下代码生成此示例的路径：
ember generate route movie
app/routes/movie.js
import Route from '@ember/routing/route';
export default class MovieRoute extends Route {
movies = [
'The Shawshank Redemption',
'The Godfather',
'The Dark Knight',
'Schindler\'s List',
'The Godfather Part II',
'12 Angry Men',
'Pulp Fiction ',
'Raging Bull',
'Parasite',
'Se7en',
'3 Idiots',
'Forrest Gump',
'The Green Mile'
]
itemString;
itemList;
helper(itemString) {
this.itemList = itemString.split(',');
for (let i = 0; i < this.itemList.length; i++)
this.itemList[i] = this.itemList[i].trim();
return this.itemList;
}
model() {
return this.movies;
}
setupController(controller, model) {
super.setupController(controller, model);
controller.set('helper', this.helper);
controller.set('movies', this.movies);
controller.set('itemString', this.itemString);
controller.set('itemList', this.itemList);
}
}
app/controllers/movie.js
import Ember from 'ember';
import { objectsAt, removeObject, removeObjects,
setObjects, reject } from '@ember/array';
export default Ember.Controller.extend({
actions: {
getItems(itemString) {
this.itemList = this.helper(itemString);
for (let i = 0; i < this.itemList.length; i++)
this.itemList[i] = parseInt(this.itemList[i]);
let tempItems = this.movies.objectsAt(this.itemList);
let str = '';
for (let i = 0; i < tempItems.length; i++)
str += tempItems[i] + '\n';
alert(str);
},
removeItems(itemString) {
this.itemList = this.helper(itemString);
if (this.itemList.length == 1)
this.movies.removeObject(this.itemList[0]);
else this.movies.removeObjects(this.itemList);
this.set('itemString', '');
},
replaceItems(itemString) {
this.movies.setObjects(this.helper(itemString));
},
findSingleWordItems() {
let reqItem = this.movies.reject(
(item) => item.split(' ').toArray().length > 1
);
alert(reqItem);
},
},
});
app/template/movie.js
{{page-title "Movie"}}
<h3>Here is a list of Movies: </h3>
<ul>
{{#each @model as |movie|}}
<li>{{movie}}</li>
{{/each}}
</ul>
<br/><br/>
<div>
<label>Enter Movies: </label>
{{input value=this.itemString}}
</div>
<div>
<input type="button" id="remove-item"
value="Remove Movie"
{{action 'removeItems' this.itemString}}/>
</div>
<br/><br/>
<div>
<label>Enter Indices: </label>
{{input value=this.itemString}}
</div>
<div>
<input type="button" id="get-item"
value="Get Movies"
{{action 'getItems' this.itemString}}/>
</div>
<br/><br/>
<div>
<label>Enter Movies: </label>
{{input value=this.itemString}}
</div>
<div>
<input type="button" id="replace-item"
value="Replace Movies"
{{action 'replaceItems' this.itemString}}/>
</div>
<br/><br/>
<input type="button" id="find-items" value="Find"
{{action 'findSingleWordItems'}}/>
{{outlet}}
输出： 访问 localhost:4200/movie 来查看输出结果
参考： https://api.emberjs.com/ember/4.4/classes/MutableArray/methods