047 v-if, v-else and v-else-if

示例

index.html

  
    
    
    
    
    
    
    
  
  
    

      
Vue Course Goals
    
    

      
My course goals
      
      Add Goal
      
No goals have been added yet - please start adding some!
      
      

        
Goal
      
      

    
  

app.js

const app = Vue.createApp({
  data() {
    return { 
      goals: [],
      goal: '' 
    };
  },
  methods: {
    addGoal() {
      this.goals.push(this.goal);
    }
  }
});

app.mount('#user-goals');

styles.css

* {
  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;
}

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

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

#user-goals ul {
  list-style: none;
  margin: 1rem 0;
  padding: 0;
}

#user-goals li {
  margin: 1rem 0;
  font-size: 1.25rem;
  font-weight: bold;
  background-color: #8ddba4;
  padding: 0.5rem;
  color: #1f1f1f;
  border-radius: 25px;
}

#user-goals input {
  font: inherit;
  border: 1px solid #ccc;
}

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

#user-goals 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);
}

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