安卓版正常，IOS内通过 document.title = ‘title’ 不生效
解决办法：
<pre>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);
}</pre>
