IOS下VUE动态修改Title无效的解决方法

// 修改标题
document.title = '测试头部';
if (navigator.userAgent.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/)) {
    var i = document.createElement('iframe');
    i.src = '/favicon.ico';
    i.style.display = 'none';
    i.onload = () => {
        setTimeout(() => {
            i.remove();
        }, 9);
    };
    document.body.appendChild(i);
}