Node.isConnected
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2020年1月.
isConnected 是 Node 的一个只读属性接口。无论节点是否与 DOM 树连接，该属性都会返回一个布尔值。例如：Document 对象与一般 DOM 树连接，ShadowRoot 与 shadow DOM 连接。
语法
var isItConnected = nodeObjectInstance.isConnected
返回值
返回 布尔值 — 如果该节点与 DOM 树连接则返回 true, 否则返回 false。
样例
标准 DOM 树
js
let test = document.createElement("p"); console.log(test.isConnected); // Returns false document.body.appendChild(test); console.log(test.isConnected); // Returns true Shadow DOM 树
js
// Create a shadow root var shadow = this.attachShadow({ mode: "open" }); // Create some CSS to apply to the shadow dom var style = document.createElement("style"); console.log(style.isConnected); // returns false style.textContent = ".wrapper {" + "position: relative;" + "}" + ".info {" + "font-size: 0.8rem;" + "width: 200px;" + "display: inline-block;" + "border: 1px solid black;" + "padding: 10px;" + "background: white;" + "border-radius: 10px;" + "opacity: 0;" + "transition: 0.6s all;" + "position: absolute;" + "bottom: 20px;" + "left: 10px;" + "z-index: 3;" + "}" + // Attach the created style element to the shadow dom shadow.appendChild(style); console.log(style.isConnected); // Returns true 规范
| Specification |
|---|
| DOM # ref-for-dom-node-isconnected① |
浏览器兼容性
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