Storage.getItem()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Storage 接口的 getItem() 方法,当传递一个键名时,将返回该键的值;而如果在给定的 Storage 对象中不存在该键,则返回 null

语法

js
getItem(keyName)

参数

keyName

一个包含你要检索的键名字符串。

返回值

一个包含键值的字符串。如果该键名不存在,则返回 null

示例

下面的函数从本地存储中获取三个数据项,然后使用他们在页面上设置自定义样式:

js
function setStyles() {
  const currentColor = localStorage.getItem("bgcolor");
  const currentFont = localStorage.getItem("font");
  const currentImage = localStorage.getItem("image");

  document.getElementById("bgcolor").value = currentColor;
  document.getElementById("font").value = currentFont;
  document.getElementById("image").value = currentImage;

  htmlElem.style.backgroundColor = `#${currentColor}`;
  pElem.style.fontFamily = currentFont;
  imgElem.setAttribute("src", currentImage);
}

备注:有关实际运行的例子,详见 Web Storage 演示

规范

Specification
HTML Standard
# dom-storage-getitem-dev

浏览器兼容性

BCD tables only load in the browser

相关链接