wx.showModal 的content异常：出现白色背景并可编辑了

{

    "system":"iOS 11.2.1",

    "version":"6.6.0",

    "errMsg":"getSystemInfo:ok",

    "fontSizeSetting":16,

    "model":"iPhone 6s<iPhone8,1>",

    "pixelRatio":2,

    "windowHeight":603,

    "screenWidth":375,

    "screenHeight":667,

    "windowWidth":375,

    "language":"zh_CN",

    "brand":"iPhone",

    "platform":"ios",

    "SDKVersion":"1.7.1"

}