微信小程序使用textarea时，滑动屏幕字总是飘的解决方案

微信小程序使用textarea时，滑动屏幕字总是飘的解决方案

页面：

<textareawx:if="{{sslyareashow}}"class="textarea_tsnrzy"placeholder=""value=""bindinput='sshlyInput'id="sslyarea"></textarea>

js文件：

data:{zheight:0,sslyareashow: true,sslyareaheight:0,
}
onLoad:function(options){wx.getSystemInfo({success: function (res) {console.log(res.windowWidth);console.log(res.windowHeight);var zheight = res.windowHeight;that.setData({zheight: zheight});},})const query = wx.createSelectorQuery()query.select('#sslyarea').boundingClientRect()query.selectViewport().scrollOffset()(function (res) {that.setData({sslyareaheight: res[0].top});})
}
onPageScroll: function (e) {var sslycj = this.data.sslyareaheight - this.data.zheight;if (e.scrollTop <= sslycj){this.setData({sslyareashow: false})}else {this.setData({sslyareashow: true})}},