uniapp 获取键盘高度

//  监听键盘高度变化
uni.onKeyboardHeightChange((obj)=>{
    // 获取系统信息
	let _sysInfo = uni.getSystemInfoSync();
	let _heightDiff = _sysInfo.screenHeight - _sysInfo.windowHeight
	let _diff = obj.height - _heightDiff
	// 键盘高度
	height = (_diff > 0 ? _diff : 0) - 2 + "px";
})