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history-undo

v1.0.2

Published

undo/redo stack for managing histories

Downloads

4

Readme

history-undo

一个用于管理历史状态的库,支持撤销与重做

安装

npm i history-undo --save

使用

引入模块

  1. ES6 import 引入
import { History } from 'history-undo'
  1. CommonJs require 引入
const { History } = require('history-undo')
  1. Browser script 引入
<script src="/dist/history.min.js"></script>

基础用法

示例:

const history = new History()

let obj = { value: 100 }
history.push(obj)
obj.value = 200
history.push(obj)

console.log('[ undo ]:  ', history.undo())  // { value: 100 }
console.log('[ redo ]: ', history.redo()) // { value: 200 }
console.log('[ undo ]:  ', history.undo())  // { value: 100 }
console.log('[ current ]: ', history.current) // { value: 100 }

API

History

创建实例

new History(options)

options.maxLength {Number}: 栈最大长度(最多可保存的状态数量,超过后移出最先入栈的数据),默认为10 options.onChange {Function}: 调用push/undo/redo/clear时的事件回调

push

新状态入栈

history.push(target)

target {Object}: 任意要保存的状态数据

undo

撤销,返回上一个保存的状态数据。如果不可撤销,则返回null

history.undo()

redo

重做,返回下一个保存的状态数据。如果不可重做,则返回null

history.redo()

clear

清空栈内容

history.clear()

current

只读属性,返回当前状态数据

history.current

undoable

只读属性,是否可撤销

history.undoable

redoable

只读属性,是否可重做

history.redoable

count

只读属性,栈长度(保存的状态数量)

history.count

测试

npm run test