js修改IOS微信title

安卓版正常，IOS内通过 document.title = ‘title’ 不生效
解决办法：

document.title = '页面标题';
 var iframe = document.createElement('iframe');
 iframe.src = '../assets/images/100x100.png';
 iframe.style.display = 'none';
 (document.body||document.documentElement).appendChild(iframe);
 iframe.onload = function() {
 setTimeout(function() {
 iframe.remove()
 }, 0);
 }