HTML DOM customElements upgrade()用法及代碼示例

customElementsupgrade()方法升級所有的shadow-containing個自定義元素的節點子樹中的文檔，甚至在它們連接到主文檔之前。

用法:

customElements.upgrade(root);

Parameters:

root:具有要升級的shadow-containing後代元素的節點實例。

返回值：此方法返回void。

例：

HTML

<!DOCTYPE HTML> 
<html> 
  
<body style="text-align:center;"> 
    <h1 style="color:green;"> 
        GeeksforGeeks 
    </h1> 
  
    <p> 
        HTML | customElements upgrade() method 
    </p> 
  
    <button onclick="Geeks()"> 
        Check 
    </button> 
  
    <button onclick="upg()">Upgrade</button> 
      
    <p id="a"></p> 
  
    <script> 
        var a = document.getElementById("a"); 
  
        const el = document 
            .createElement("gfg-custom-element"); 
  
        class CustomEl extends HTMLElement { 
            constructor() { 
                super() 
                this.attachShadow({ mode:'open' }) 
                this.shadowRoot.innerHTML = ` 
                      <h1 style="color:green;">   
                        GeeksforGeeks Custom Element Data 
                    </h1> 
                    ` 
            } 
        } 
        window.customElements.define( 
                'gfg-custom-element', CustomEl); 
                  
        function Geeks() { 
            a.innerHTML = "Upgraded:"  
                + (el instanceof CustomEl); 
        } 
        function upg() { 
            customElements.upgrade(el); 
        } 
    </script> 
</body> 
  
</html>

輸出：

支持的瀏覽器：

穀歌瀏覽器
Edge
Firefox
Safari
Opera

相關用法

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