以下是从此网页截图中获取到的关键漏洞信息，简洁地用Markdown格式表示 : javascript - if (origin.indexOf('://') === -1) return from.includes(origin) + const fromProtocol = from.indexOf('://') + if (fromProtocol !== -1) from = from.slice(fromProtocol + 3) + return origin === from