state - Web API 接口参考 编辑

返回在 history 栈顶的 任意 值的拷贝。 通过这种方式可以查看 state 值，不必等待 popstate事件发生后再查看。

语法

let currentState = history.state;

如果不进行下面两种类型的调用，state 的值将会是 null 

pushState() or replaceState().

例子

下面 log 例句输出 history.state 的值，首先是在没有执行 pushState() 语句进而将值 push 到 history 之前的 log。下面一行 log 语句再次输出 state 值，此时 history.state 已经有值。可以在脚本文件中执行下面语句，或者在控制台直接执行。

// 值为 null 因为我们还没有修改 history 栈
console.log(`History.state before pushState: ${history.state}`);

// 现在 push 一些数据到栈里
history.replaceState({name: 'Example'}, "pushState example", 'page3.html');

// 现在 state 已经有值了
console.log(`History.state after pushState: ${history.state}`);

SpecificationsE

Specification	Status	Comment
HTML Living Standard The definition of 'History' in that specification.	Living Standard	Adds the scrollRestoration attribute.
HTML5 The definition of 'History' in that specification.	Recommendation	Initial definition.
Custom Scroll Restoration - History-based API The definition of 'History' in that specification.	Draft	Adds the scrollRestoration attribute.

Browser compatibility

BCD tables only load in the browser

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.

See also

• Working with the History API