CoffeeTalk/lib/we-cropper.wxml

<template name="we-cropper">
  <canvas
    class="cropper"
    disable-scroll="true"
    bindtouchstart="touchStart"
    bindtouchmove="touchMove"
    bindtouchend="touchEnd"
    style="width:{{width}}px;height:{{height}}px;background-color: rgba(0, 0, 0, 0.8)"
    canvas-id="{{id}}">
  </canvas>
  <canvas
    class="cropper"
    disable-scroll="true"
    style="position: fixed; top: -{{width * pixelRatio}}px; left: -{{height * pixelRatio}}px; width:{{width * pixelRatio}}px;height:{{height * pixelRatio}}px;"
    canvas-id="{{targetId}}">
  </canvas>
</template>