Vue: 动态修改CSS样式

以下的code,可以动态修改 class, 以及 background-color,或显示/隐藏一个paragraph:

DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Vue Basicstitle>
    <link
      href="https://fonts.googleapis.com/css2?family=Jost:wght@400;700&display=swap"
      rel="stylesheet"
    />
    <link rel="stylesheet" href="styles.css" />
    <script src="https://unpkg.com/vue@next" defer>script>
    <script src="app.js" defer>script>
  head>
  <body>
    <header>
      <h1>Vue Stylingh1>
    header>
    <section id="assignment">
      
      
      <input type="text" v-model="inputClass" />

      
      <p :class="paraClasses">Style me!p>
      <button @click="toggle">Toggle Paragraphbutton>
      
      

      
      <input type="text" v-model="bgcolor" />
      <p :style="{backgroundColor:bgcolor}">Style me inline!p>
    section>
  body>
html>

Javascript:

const app = Vue.createApp({
  data() {
    return {
      inputClass: "",
      vb: true,
      bgcolor: "",
    };
  },
  computed: {
    paraClasses() {
        return {
            user1: this.inputClass==='user1',
            user2: this.inputClass==='user2',
            visible: this.vb,
            hidden: !this.vb,
        }
    }
  },
  methods: {
    toggle() {
      this.vb = !this.vb;
    },
  },
});
app.mount("#assignment");
* {
  box-sizing: border-box;
}

html {
  font-family: 'Jost', sans-serif;
}

body {
  margin: 0;
}

header {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.26);
  margin: 3rem;
  border-radius: 10px;
  padding: 1rem;
  background-color: #1b995e;
  color: white;
  text-align: center;
}

#assignment {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.26);
  margin: 3rem;
  border-radius: 10px;
  padding: 1rem;
  text-align: center;
}

#assignment h2 {
  font-size: 2rem;
  border-bottom: 4px solid #ccc;
  color: #1b995e;
  margin: 0 0 1rem 0;
}

p {
  font-size: 1.25rem;
  font-weight: bold;
  background-color: #8ddba4;
  padding: 0.5rem;
  color: #1f1f1f;
  border-radius: 25px;
}

#assignment input {
  font: inherit;
  border: 1px solid #ccc;
}

#assignment input:focus {
  outline: none;
  border-color: #1b995e;
  background-color: #d7fdeb;
}

#assignment button {
  font: inherit;
  cursor: pointer;
  border: 1px solid #ff0077;
  background-color: #ff0077;
  color: white;
  padding: 0.05rem 1rem;
  box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.26);
}

#assignment button:hover,
#assignment button:active {
  background-color: #ec3169;
  border-color: #ec3169;
  box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.26);
}

.user1 {
  background-color: blue;
  color: white;
}

.user2 {
  background-color: purple;
  color: white;
}

.hidden {
  display: none;
}

.visible {
  display: block;
}

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