StylePropertyMapReadOnly: entries() 方法

entries()

// grab a DOM element
const buttonEl = document.querySelector("button");

// we can retrieve all computed styles with `computedStyleMap`
const allComputedStyles = buttonEl.computedStyleMap();

// entries returns an iterable of the items
const iterableStyles = allComputedStyles.entries();

// returns a two item array with align-content as the first item and CSSStyleValue as the second
console.log(iterableStyles.next().value);