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js如何获取键盘高度

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07/30
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在移动端或混合app开发中，js如何获取键盘高度，直接贴上代码吧

input是一个html input 标签

var timer = {
id:null,
run:function (callback,time) {
this.id = window.setInterval(callback,time);
},
clean:function () {
var that = this;
this.id = window.clearInterval(that.id);
}
};
var keyboardHeight = 0,screenHeight = window.innerHeight;
input.addEventListener('focus',function (evt) {
if(!keyboardHeight){
timer.run(function () {
if (screenHeight !== window.innerHeight) {
keyboardHeight = screenHeight-window.innerHeight;
timer.clean()
}
}, 50)
}
});
input.focus();