Finally! Half done! About display problems！（最终，搞定一半！关于显示问题！）

[xjh093]

I modified this file：

file：miniprogram_npm/hanzi-writer-miniprogram/index.js method：var RenderTarget = function () { // xxxxx }

  function RenderTarget(view) {
    _classCallCheck(this, RenderTarget);

    this.view = view;
    this.eventEmitter = new _EventEmitter2.default();
    //this.ctx = polyfillCanvasCtx(wx.createCanvasContext('writer-canvas', view));
    //this.canvas = this.view.selectComponent('#writer-canvas');

    const query = wx.createSelectorQuery().in(view);
    query.select('#writer-canvas')
         .fields({ node: true, size: true })
     .exec((res) => {
            console.log("res1");
            console.log(res);
            console.log("res2");

            this.canvas = res[0].node;
            //this.ctx = polyfillCanvasCtx(this.canvas.getContext('2d'));
            this.ctx = this.canvas.getContext('2d');
         });
  }

but, there is a problem its display:

[xjh093]

base lib: 2.21.0

[xjh093]

Resolved, waiting for author merge pr 53