解决办法：
// 解决ios上页面上移的bug
setTimeout(function(){
if(document.activeElement.tagName == 'INPUT' || document.activeElement.tagName == 'TEXTAREA'){
return
}
var result = 'pc';
if(/(iPhone|iPad|iPod|iOS)/i.test(navigator.userAgent)) { //判断iPhone|iPad|iPod|iOS
result = 'ios'
}else if(/(Android)/i.test(navigator.userAgent)) { //判断Android
result = 'android'
}
if( result = 'ios' ){
document.activeElement.scrollIntoViewIfNeeded(true);
var scrollHeight = document.documentElement.scrollTop || document.body.scrollTop || 0;
window.scrollTo(0, Math.max(scrollHeight - 1, 0));
}
},10)
