【Vue】动态样式

内联样式的动态样式

body(){ boxASelect:false, }
v-bind:style="{borderColor:boxASelect ? 'red' : '#ccc'}"

  <body>
    <header>
      <h1>Vue Dynamic Styling</h1>
    </header>
    <section id="styling">
      <div class="demo" :class="boxAClasses" @click="boxSelected('A')"></div>
      <div class="demo" :class="boxBClasses" @click="boxSelected('B')"></div>
      <div class="demo" :class="boxCClasses" @click="boxSelected('C')"></div>
    </section>
  </body>

const app = Vue.createApp({
	data() {
		return {
			boxASelected: false,
			boxBSelected: false,
			boxCSelected: false,
		};
	},
	computed: {
		boxAClasses() {
			return { active: this.boxASelected };
		},
		boxBClasses() {
			return { active: this.boxBSelected };
		},
		boxCClasses() {
			return { active: this.boxCSelected };
		},
	},
	methods: {
		boxSelected(box) {
			if (box === 'A') {
				this.boxASelected = !this.boxASelected;
			} else if (box === 'B') {
				this.boxBSelected = !this.boxBSelected;
			} else {
				this.boxCSelected = !this.boxCSelected;
			}
		},
	},
});

app.mount('#styling');

也可以使用:class="['demo' ,{ active: this.boxASelected }]"

---

作业题

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Vue Basics</title>
    <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@3/dist/vue.global.js"></script>
    <script src="app.js" defer></script>
  </head>

  <body>
    <header>
      <h1>Vue Styling</h1>
    </header>
    <section id="assignment">
      <!-- 1) Fetch the user input and use it as a CSS class -->
      <!-- The entered class should be added to the below paragraph -->
      <input type="text" v-model="inputClass" />
      <!-- (available classes: "user1", "user2") -->
      <p :class="paraClass">Style me!</p>
      <button @click="toggleParagraphvisibility">Toggle Paragraph</button>
      <!-- 2) Use the "visible" and "hidden" classes to show/ hide the above paragraph -->
      <!-- Clicking the button should toggle between the two options -->

      <!-- 3) Add dynamic inline styling to the below paragraph and let the user enter a background-color -->
      <input type="text" v-model="inputBackgroundColor" />
      <p :style="{backgroundColor:inputBackgroundColor}">Style me inline!</p>
    </section>
  </body>
</html>

* {
  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;
}

const app = Vue.createApp({
  data() {
    return {
      inputClass: "",
      paragraphIsVisible: true,
      inputBackgroundColor: "",
    }
  },
  methods: {
    toggleParagraphvisibility() {
      this.paragraphIsVisible = !this.paragraphIsVisible
    },
  },
  computed: {
    paraClass() {
      return {
        user1: this.inputClass === "user1",
        user2: this.inputClass === "user2",
        visible: this.paragraphIsVisible,
        hidden: !this.paragraphIsVisible,
      }
    },
  },
})

app.mount("#assignment")

效果