CustomElementRegistry.upgrade() - Web API 接口参考 编辑

CustomElementRegistry接口的upgrade()方法将更新节点子树中所有包含阴影的自定义元素，甚至在它们连接到主文档之前也是如此。

语法

customElements.upgrade(root);

参数

root

待升级的包含阴影的派生元素节点 。如果没有可升级的派生实例，则不会抛出异常。

返回值

空.

示例

摘至HTML 规范:

const el = document.createElement("spider-man");

class SpiderMan extends HTMLElement {}
customElements.define("spider-man", SpiderMan);

console.assert(!(el instanceof SpiderMan)); // not yet upgraded

customElements.upgrade(el);
console.assert(el instanceof SpiderMan);    // upgraded!

规范

Specification	Status	Comment
HTML Living Standard customElements.upgrade()	Living Standard	Initial definition.

浏览器支持

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