SOURCE

var clientHeight = document.documentElement.clientHeight || document.body.clientHeight;
$(window).on('resize', function () {
    var nowClientHeight = document.documentElement.clientHeight || document.body.clientHeight;
    if (clientHeight > nowClientHeight) {
        //键盘弹出的事件处理
        
    }
    else {
        //键盘收起的事件处理
       
    }
});