* 在元素前面添加兄弟元素或HTML字符串 * @param element 目标元素 * @param content 兄弟元素或HTML字符串 * @example * // 元素a.xx前面添加一个元素 * DOMUtils.before(document.querySelector("a.xx"),document.querySelector("b.xx")) * DOMUtils.before("a.xx","' ") *
(element: HTMLElement | Element | string, content: HTMLElement | string)
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