//真机调试不能隐藏掉 camera
<camera class="myCamera" device-position="{{devicePosition}}" frame-size="small" flash='off' wx:if="{{isShow}}"></camera>
Page({
  data: {isShow: false},
  onLoad() {
    this.setData({isShow: true})
  },
})
//真机调试可以隐藏掉 camera
<camera class="myCamera" device-position="{{devicePosition}}" frame-size="small" flash='off' wx:if="{{!isShow}}"></camera>
Page({
  data: {isShow: false},
  onLoad() {

  },
})

//以上两种方式模拟器上都没问题