Ember.js Ember.NativeArray replace() 方法

Ember.js 是一个开源的JavaScript框架，用于基于模型-视图-控制器（MVC）架构开发大型客户端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。

replace() 方法用于使用给定的对象替换数组中的一些元素。

语法：

replace(idx,amt,obj);

参数:

idx: 在数组中替换的起始索引
amt: 要从数组中删除的元素的数量
obj: 包含零个或多个要添加到数组中的项目的数组

返回值: 不返回任何内容。

安装和运行Ember.js的步骤:

步骤1: 要运行以下示例，您需要先拥有一个Ember项目。要创建一个项目，您需要首先安装ember-cli。在终端中写入以下代码:

npm install ember-cli

步骤2： 现在你可以通过输入以下代码来创建项目：

ember new <project-name> --lang en

步骤3： 启动服务器，输入：

ember serve

示例1： 在此示例中，输入以下代码生成名为“party”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",
    ];
    item;
    itemString;
    itemList;
    start;
    end;
    idx;
 
    model() {
        return this.partyItems;
    }
 
    setupController(controller, model) {
        this._super(controller, model);
        controller.set("partyItems", this.partyItems);
        controller.set("item", this.item);
        controller.set("itemString", this.itemString);
        controller.set("itemList", this.itemList);
        controller.set("start", this.start);
        controller.set("end", this.end);
        controller.set("idx", this.idx);
    }
}

app/controllers/party.js:

import Ember from "ember";
 
export default Ember.Controller.extend({
 
    actions: {
        replaceItem(itemString) {
            this.itemList = itemString.split(",").toArray();
            if (this.itemList.length >
                this.partyItems.length) alert("Error");
            this.partyItems.replace(0,
                this.itemList.length, this.itemList);
        },
    },
});

app/template/party.hbs:

{{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 Item: </label>
      {{input value=this.item}}
</div>
<div>
    <input
        type="button"
        id="remove-item"
        value="Remove Item"
        {{action "withoutItem" this.item}}
  />
</div>
<br />
<br />
<div>
    <label>Enter Items: </label>
      {{input value=this.itemString}}
</div>
<div>
    <input
        type="button"
        id="add-item"
        value="Add Items"
        {{action "addItems" 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="remove-items"
        value="Remove Items"
        {{action "removeItems" this.start this.end}}
  />
</div>
<br />
<br />
<div>
    <label>Enter Index: </label>
      {{input value=this.idx}}
</div>
<div>
    <input
        type="button"
        id="get-item"
        value="Get Item"
        {{action "getItem" this.idx}}
      />
</div>
<br />
<br />
<div>
    <label>Enter Items: </label>
      {{input value=this.itemString}}
</div>
<div>
    <input
        type="button"
        id="replace-item"
        value="Replace Items"
        {{action "replaceItem" this.itemString}}
      />
</div>
<br />
<br />
<input
    type="button"
      id="get-multipleword"
      value="Get Multipleword Items!"
      {{action "findMultipleWordItems"}}
/>
<br />
<br />
<input
    type="button"
      id="get-unique"
      value="Get Unique Items!"
      {{action "getUniqueItems"}}
/>
{{outlet}}

输出： 访问 localhost:4200/part y 以查看输出

Ember.js Ember.NativeArray replace() 方法

示例2： 输入以下代码以生成此示例的路径。

ember generate route notepad

app/routes/notepad.js:

import Route from "@ember/routing/route";
 
export default class NotepadRoute extends Route {
    items = [];
    item;
    model() {
        return this.items;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set("items", this.items);
    }
}

app/controllers/notepad.js:

import Ember from "ember";
import { pushObject } from "@ember/array";
 
export default Ember.Controller.extend({
    actions: {
        withoutItem(item) {
            let tempItems;
            tempItems = this.items.without(item);
            let str = "";
            for (let i = 0; i < tempItems.length; i++)
                str += tempItems[i] + "\n";
            alert(str);
            this.set("item", "");
        },
        replaceItem(item) {
            let itemList = item.split(",").toArray();
            if (itemList.length > this.items.length)
                alert("Error");
            this.items.replace(0, itemList.length, itemList);
        },
        addItem(item) {
            this.items.unshiftObject(item);
        },
        getUniqueItems() {
            let tempItems = this.items.uniq();
            let str = "";
            for (let i = 0; i < tempItems.length; i++)
                str += tempItems[i] + "\n";
            alert(str);
            this.set("item", "");
        },
    },
});

app/template/notepad.hbs：

{{page-title "Notepad"}}
<h2>Notepad</h2>
<div>
    <label>Enter Item: </label>
      {{input value=this.item}}
</div>
<div>
    <input
        type="button"
           id="add-item"
        value="Add Item"
        {{action "addItem" this.item}}
      />
</div>
<br />
<br />
<ul>
    {{#each @model as |item|}}
        <li>{{item}}</li>
      {{/each}}
</ul>
<br />
<br />
<div>
    <label>Enter Item: </label>
      {{input value=this.item}}
</div>
<div>
    <input
        type="button"
        id="without-item"
        value="Without Item"
        {{action "withoutItem" this.item}}
      />
</div>
<br />
<br />
<div>
    <label>Enter Item: </label>
      {{input value=this.item}}
</div>
<div>
    <input
        type="button"
        id="replace-item"
        value="Replace Item"
        {{action "replaceItem" this.item}}
      />
</div>
<br />
<br />
<input
    type="button"
      id="get-unique"
      value="Get Unique Items!"
      {{action "getUniqueItems"}}
/>
{{outlet}}

输出：

访问 localhost:4200/notepad 以查看输出：

Ember.js Ember.NativeArray replace() 方法