修复 IOS 键盘弹出空白的问题

// 修复 IOS 键盘弹出空白的问题
let ua = window.navigator.userAgent;
let app = window.navigator.appVersion;
//$alert('浏览器版本: ' + app + '\n' + '用户代理: ' + ua);
if (!!ua.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/)) {
    //$alert('ios端');
    $("input,textarea").on("blur", function () {
        var currentPosition, timer;
        var speed = 1;
        timer = setInterval(function () {
            currentPosition = document.documentElement.scrollTop || document.body.scrollTop;
            currentPosition -= speed;
            window.scrollTo(0, currentPosition);//页面向上滚动
            currentPosition += speed;
            window.scrollTo(0, currentPosition);//页面向下滚动
            clearInterval(timer);
        }, 100);
    })
} else if (ua.indexOf('Android') > -1 || ua.indexOf('Adr') > -1) {
    //$alert('android端');
}