onLoad(options){     var image = wx.createImage(); }报错说 wx.createImage is not a function

 <scroll-view class='scroll-video-box' scroll-y="true" scroll-x="true" bindtouchmove="touchmoveCallback" bindtouchstart="touchstartCallback">    <live-player id="livePlayer" binderror="error" bindstatechange="statechange" mode="RTC" src="{{isHD ? videoHDSrc :videoSrc}}" catchtap="onVideoTap" muted="{{!openSound}}" style="width:{{scaleWidth }}px;height:{{scaleHeight}}px" class="video-item" bindfullscreenchange="{{fullscreenChange}}" object-fit="{{objectFit}}">  </live-player>  </scroll-view>  想实现一个视频双指缩放功能，为什么视频全屏展示时    bindtouchmove、bindtouchstart无法触发？