length 只读特性在 存储 interface returns the number of data items stored in a given 存储 对象。

句法

length = storage.length;
					

返回值

The number of items stored in the 存储 对象。

范例

The following function adds three data items to the local storage for the current domain, then returns the number of items in the storage:

function populateStorage() {
  localStorage.setItem('bgcolor', 'yellow');
  localStorage.setItem('font', 'Helvetica');
  localStorage.setItem('image', 'cats.png');
  return localStorage.length; // Should return 3
}
					

注意 : For a real world example, see our Web 存储演示 .

规范

规范 状态 注释
HTML 实时标准
The definition of 'Storage.length' in that specification.
实时标准

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
length Chrome 4 Edge 12 Firefox 3.5 IE 8 Opera 10.5 Safari 4 WebView Android Yes Chrome Android 18 Firefox Android 6 Opera Android 11 Safari iOS 3.2 Samsung Internet Android 1.0

图例

完整支持

完整支持

另请参阅

元数据

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