H5 键盘挡住输入框

1. 输入框获取交焦点之后，使用定时器循环判断浏览器可视窗口的大小，然后设置整个页面的滚动距离。

$('input').on('focus', function() {
                    var h = this.offsetHeight,
                        t = this.offsetTop;
                    var timer = setInterval(function() {
                        var hs2 = document.documentElement.clientHeight || document.body.clientHeight;
                        var tH = window.scrollY;
                        if (isAndroid && hScreen>hs2) {
                                //使用原生
                                // document.body.scrollTop = hScreen - hs2;
                                // document.documentElement.scrollTop = hScreen - hs2;
                                // 使用zepto.js库
                                $(document).scrollTop(hScreen - hs2);
                                clearInterval(timer);
                        }
                    }, 100)
                })

1. 给浏览器添加resize事件，然后判断输入框时候获取当前页面的焦点，

The issue names no files or tests; start by locating the H5 input and focus handling. Compare the timer and resize-event approaches described, and verify that the focused input remains visible when the Android keyboard opens.