Javascript 创建头元素不是'；IE中不允许，大多数浏览器中都有错误

通过阅读，我看到：

// Creating a head element isn't allowed in IE, and faulty in most browsers,
// so it is not allowed
if (element.nodeName.toLowerCase() === "head") {
    throw new Error("Attempted to replace a head element - this is not allowed.");
}

我知道替换头标签是不可靠的，但是替换它的内容呢？风险是什么

var head = document.getElementsByTagName("head")[0];
head.innerHTML = "<title>lol magic</title>";

var head=document.getElementsByTagName（“head”）[0]；
head.innerHTML=“lol magic”；