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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
​
​
​
<div id="app" class="text-center">
  <h3>Let's check out the lifecycle of this hur' child.</h3>
  <h4>Check the console!</h4>
  
  <button @click="toggleShow" class="btn btn-primary">
    <span v-if="isShowing">Hide child</span>
    <span v-else>Show child</span>
  </button>
  
  <hr>
  
  
  <!-- 無使用 keep-alive -->
  <!-- <app-child v-if="isShowing"></app-child> -->
  
  
  <!-- 使用 keep-alive -->
  <keep-alive>
    <app-child v-if="isShowing"></app-child>
  </keep-alive>
  
</div>
​
​
  
<script type="text/x-template" id="childarea">
  <div>
    <h4>Hello! {{ text }}</h4>
    <input type="text" class="form-control" v-model="text">
  </div>
</script>
  
  <!-- development version, includes helpful console warnings -->
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
​
</body>
</html>
 
h6, .h6 {
    font-size: 1rem;
}
​
.p-3 {
    padding: 1rem !important;
}
​
.bg-primary {
    background-color: #4fc08d !important;
}
​
.box {
    display: inline-block;
    width: 5rem;
    height: 5rem;
    margin: .25rem;
    background-color: #f5f5f5;
    border: 1px solid;
}
​
.btn {
    display: inline-block;
    font-weight: 400;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
​
.btn-outline-secondary {
    color: #6c757d;
    background-color: transparent;
    background-image: none;
    border-color: #6c757d;
}
​
.btn:not(:disabled):not(.disabled) {
    cursor: pointer;
}
​
.d-flex {
    display: -ms-flexbox !important;
    display: flex !important;
}
​
.justify-content-center {
    -ms-flex-pack: center !important;
    justify-content: center !important;
}
​
.align-items-center {
    -ms-flex-align: center !important;
    align-items: center !important;
}
Output

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anonymouspro
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