Component Party 标志

Component Party 中文版

响应式

声明状态

Svelte 4 标志 Svelte 4

<script>
  let name = "张三";
</script>

<h1>你好 {name}</h1>

Aurelia 1 标志 Aurelia 1

<template>
  <h1>你好 ${name}</h1>
</template>

更新状态

Svelte 4 标志 Svelte 4

<script>
  let name = "张三";
  name = "李四";
</script>

<h1>你好 {name}</h1>

Aurelia 1 标志 Aurelia 1

<template>
  <h1>你好 ${name}</h1>
</template>

计算属性

Svelte 4 标志 Svelte 4

<script>
  let count = 10;
  $: doubleCount = count * 2;
</script>

<div>{doubleCount}</div>

Aurelia 1 标志 Aurelia 1

<template>
  <div>${doubleCount}</div>
</template>

模板语法

最简模板

Svelte 4 标志 Svelte 4

<h1>你好，世界</h1>

Aurelia 1 标志 Aurelia 1

<template>
  <h1>你好，世界</h1>
</template>

样式

Svelte 4 标志 Svelte 4

<h1 class="title">我是红色的</h1>
<button style="font-size: 10rem;">我是一个按钮</button>

<style>
  .title {
    color: red;
  }
</style>

Aurelia 1 标志 Aurelia 1

.title {
  color: red;
}

DOM循环

Svelte 4 标志 Svelte 4

<script>
  const colors = ["红", "绿", "蓝"];
</script>

<ul>
  {#each colors as color (color)}
    <li>{color}</li>
  {/each}
</ul>

Aurelia 1 标志 Aurelia 1

<template>
  <ul>
    <li repeat.for="color of colors">${color}</li>
  </ul>
</template>

点击事件

Svelte 4 标志 Svelte 4

<script>
  let count = 0;

  function incrementCount() {
    count++;
  }
</script>

<p>计数器: {count}</p>
<button on:click={incrementCount}>+1</button>

Aurelia 1 标志 Aurelia 1

<template>
  <p>计数器: ${count}</p>
  <button click.trigger="incrementCount()">+1</button>
</template>

DOM引用

Svelte 4 标志 Svelte 4

<script>
  import { onMount } from "svelte";

  let inputElement;

  onMount(() => {
    inputElement.focus();
  });
</script>

<input bind:this={inputElement} />

Aurelia 1 标志 Aurelia 1

<template>
  <input ref="inputElement" />
</template>

条件渲染

Svelte 4 标志 Svelte 4

<script>
  const TRAFFIC_LIGHTS = ["红灯", "黄灯", "绿灯"];
  let lightIndex = 0;

  $: light = TRAFFIC_LIGHTS[lightIndex];

  function nextLight() {
    lightIndex = (lightIndex + 1) % TRAFFIC_LIGHTS.length;
  }
</script>

<button on:click={nextLight}>下一个灯</button>
<p>现在亮着的是: {light}</p>
<p>
  你应该
  {#if light === "红灯"}
    <span>停下</span>
  {:else if light === "黄灯"}
    <span>慢行</span>
  {:else if light === "绿灯"}
    <span>赶紧走</span>
  {/if}
</p>

Aurelia 1 标志 Aurelia 1

<template>
  <button click.trigger="nextLight()">下一个灯</button>
  <p>现在亮着的是: ${light}</p>
  <p>
    你应该
    <span if.bind="light === '红灯'">停下</span>
    <span if.bind="light === '黄灯'">慢行</span>
    <span if.bind="light === '绿灯'">赶紧走</span>
  </p>
</template>

生命周期

组件加载时

Svelte 4 标志 Svelte 4

<script>
  import { onMount } from "svelte";
  let pageTitle = "";
  onMount(() => {
    pageTitle = document.title;
  });
</script>

<p>页面标题: {pageTitle}</p>

Aurelia 1 标志 Aurelia 1

<template>
  <p>页面标题: ${pageTitle}</p>
</template>

组件卸载时

Svelte 4 标志 Svelte 4

<script>
  import { onDestroy } from "svelte";

  let time = new Date().toLocaleTimeString();

  const timer = setInterval(() => {
    time = new Date().toLocaleTimeString();
  }, 1000);

  onDestroy(() => clearInterval(timer));
</script>

<p>当前时间: {time}</p>

Aurelia 1 标志 Aurelia 1

<template>
  <p>当前时间: ${time}</p>
</template>

组件组合

组件Props传参

Svelte 4 标志 Svelte 4

<script>
  import UserProfile from "./UserProfile.svelte";
</script>

<UserProfile
  name="张三"
  age={20}
  favouriteColors={["green", "blue", "red"]}
  isAvailable
/>

Aurelia 1 标志 Aurelia 1

<template>
  <require from="./user-profile"></require>
  <user-profile
    name.bind="name"
    age.bind="age"
    favourite-colors.bind="colors"
    is-available.bind="available"
  ></user-profile>
</template>

向父组件emit事件

Svelte 4 标志 Svelte 4

<script>
  import AnswerButton from "./AnswerButton.svelte";

  let isHappy = true;

  function onAnswerNo() {
    isHappy = false;
  }

  function onAnswerYes() {
    isHappy = true;
  }
</script>

<p>你快乐吗?</p>
<AnswerButton on:yes={onAnswerYes} on:no={onAnswerNo} />
<p style="font-size: 50px;">{isHappy ? "😀" : "😥"}</p>

Aurelia 1 标志 Aurelia 1

<template>
  <require from="./answer-button"></require>
  <p>你快乐吗?</p>
  <answer-button action-handler.call="handleAnswer(reply)"></answer-button>
  <p style="font-size: 50px">${isHappy ? "😀" : "😥"}</p>
</template>

slot插槽

Svelte 4 标志 Svelte 4

<script>
  import FunnyButton from "./FunnyButton.svelte";
</script>

<FunnyButton>点我!</FunnyButton>

Aurelia 1 标志 Aurelia 1

<template>
  <require from="./funny-button"></require>

  <funny-button>点我!</funny-button>
</template>

slot插槽内容

Svelte 4 标志 Svelte 4

<script>
  import FunnyButton from "./FunnyButton.svelte";
</script>

<FunnyButton />
<FunnyButton>这是传到slot的内容!</FunnyButton>

Aurelia 1 标志 Aurelia 1

<template>
  <require from="./funny-button"></require>

  <funny-button></funny-button>
  <funny-button>这是传到slot的内容!</funny-button>
</template>

上下文

Svelte 4 标志 Svelte 4

<script>
  import { setContext } from "svelte";
  import UserProfile from "./UserProfile.svelte";
  import createUserStore from "./createUserStore.js";

  const userStore = createUserStore({
    id: 1,
    username: "abcdefg",
    email: "[email protected]",
  });

  setContext("user", userStore);
</script>

<h1>欢迎回来, {$userStore.username}</h1>
<UserProfile />

Aurelia 1 标志 Aurelia 1

缺少代码片段 帮助我们改进 Component Party Component Party 标志
在 Github 上贡献

表单输入

输入框

Svelte 4 标志 Svelte 4

<script>
  let text = "你好世界";
</script>

<p>{text}</p>
<input bind:value={text} />

Aurelia 1 标志 Aurelia 1

<template>
  <p>${text}</p>
  <input value.bind="text" />
</template>

复选框

Svelte 4 标志 Svelte 4

<script>
  let isAvailable = false;
</script>

<input id="is-available" type="checkbox" bind:checked={isAvailable} />
<label for="is-available">这是一个checkbox</label>

Aurelia 1 标志 Aurelia 1

<template>
  <input id="is-available" type="checkbox" checked.bind="isAvailable" />
  <label for="is-available">这是一个checkbox</label>: ${isAvailable}
</template>

单选框

Svelte 4 标志 Svelte 4

<script>
  let picked = "red";
</script>

<div>你选择了: {picked}</div>

<input id="blue-pill" bind:group={picked} type="radio" value="blue" />
<label for="blue-pill">蓝色</label>

<input id="red-pill" bind:group={picked} type="radio" value="red" />
<label for="red-pill">红色</label>

Aurelia 1 标志 Aurelia 1

<template>
  <div>你选择了: ${picked}</div>

  <input id="blue-pill" checked.bind="picked" type="radio" value="blue" />
  <label for="blue-pill">蓝色</label>

  <input id="red-pill" checked.bind="picked" type="radio" value="red" />
  <label for="red-pill">红色</label>
</template>

选择器

Svelte 4 标志 Svelte 4

<script>
  let selectedColorId = 2;

  const colors = [
    { id: 1, text: "红" },
    { id: 2, text: "蓝" },
    { id: 3, text: "绿" },
    { id: 4, text: "灰", isDisabled: true },
  ];
</script>

<select bind:value={selectedColorId}>
  {#each colors as color}
    <option value={color.id} disabled={color.isDisabled}>
      {color.text}
    </option>
  {/each}
</select>

Aurelia 1 标志 Aurelia 1

<template>
  <select value.bind="selectedColorId">
    <option value="">选择一个颜色</option>
    <option
      repeat.for="color of colors"
      value.bind="color.id"
      disabled.bind="color.isDisabled"
    >
      ${color.text}
    </option>
  </select>
</template>

Web应用特性

渲染应用

Svelte 4 标志 Svelte 4

<!doctype html>
<html>
  <body>
    <div id="app"></div>
    <script type="module" src="./app.js"></script>
  </body>
</html>

Aurelia 1 标志 Aurelia 1

缺少代码片段 帮助我们改进 Component Party Component Party 标志
在 Github 上贡献

fetch获取数据

Svelte 4 标志 Svelte 4

<script>
  import useFetchUsers from "./useFetchUsers";

  const { isLoading, error, data: users } = useFetchUsers();
</script>

{#if $isLoading}
  <p>正在获取用户信息……</p>
{:else if $error}
  <p>获取用户信息出错</p>
{:else if $users}
  <ul>
    {#each $users as user}
      <li>
        <img src={user.picture.thumbnail} alt="user" />
        <p>
          {user.name.first}
          {user.name.last}
        </p>
      </li>
    {/each}
  </ul>
{/if}

Aurelia 1 标志 Aurelia 1

<template>
  <p if.bind="isLoading">正在获取用户信息……</p>
  <p if.bind="error">获取用户信息出错</p>
  <ul if.bind="users">
    <li repeat.for="user of users">
      <img src.bind="user.picture.thumbnail" alt="user" />
      <p>${ user.name.first } ${ user.name.last }</p>
    </li>
  </ul>
</template>