UserDataHandler

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摘要
特性
方法
常量
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Obsolete since Gecko 26 (Firefox 26 / Thunderbird 26 / SeaMonkey 2.23 / Firefox OS 1.2)
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

摘要

When associating user data with a key on a node, Node.setUserData () can also accept, in its third argument, a handler which will be called when the object is cloned, imported, deleted, renamed, or adopted. Per the specification, exceptions should not be thrown in a UserDataHandler . In both document.importNode () and Node.cloneNode () , although user data is not copied over, the handler will be called.

特性

None.

方法

handle (operation, key, data, src, dst) (no return value)

This method is a callback which will be called if a node is being cloned, imported, renamed and as well, if deleted or adopted.

operation (unsigned short) is an operation type integer (see below).
key ( DOMString ) is the user key.
data ( DOMUserData ) is the user data.
src ( 节点 ) is the source node ( null if being deleted).
dst ( 节点 ) is the destination node (if any, or null ).

常量

常量	值	操作
`NODE_CLONED`	1	`Node.cloneNode ()`
`NODE_IMPORTED`	2	`Document.importNode ()`
`NODE_DELETED` Unimplemented (see bug 550400 )	3
`NODE_RENAMED` Unimplemented	4	`Node.renameNode ()`
`NODE_ADOPTED`	5	`Document.adoptNode ()`

( NODE_RENAMED is currently not supported since Node.renameNode () is not supported.)

规范

DOM Level 3 Core: UserDataHandler

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`UserDataHandler` 弃用非标	Chrome No	Edge No	Firefox 4 — 22	IE ?	Opera No	Safari No	WebView Android No	Chrome Android No	Firefox Android 4 — 22	Opera Android No	Safari iOS No	Samsung Internet Android No
`handle` 弃用非标	Chrome No	Edge No	Firefox 4 — 22	IE ?	Opera No	Safari No	WebView Android No	Chrome Android No	Firefox Android 4 — 22	Opera Android No	Safari iOS No	Samsung Internet Android No

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摘要

特性

方法

常量

规范

浏览器兼容性

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