<div id="app"></div>

<script>

    /* 找到對應id */
    let item = document.getElementById('app');
    /* 宣告變數 */
    let username1 = 'ann';
    let username2 = 'ben';
    /* 替換內容 */
    item.innerHTML = `
    <h1> hello ${username1}</h1>
    <h2> hello ${username2}</h2>
`

</script>

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