代码片段：https://https://developers.weixin.qq.com/s/itksKBmF7lfd

使用drawImage绘制图片，图片仅显示一小部分，原始图片：

显示状态：

实在找不到原因了，非常简单的代码：

JS:

const app = getApp()

Page({

  data: {

    isShowImage: true,

    clientwidth: 360,

    clientheight: 640,

    pixelratio: 3,

    ratio: 0,

    src: '/index/1.jpg'

  },

  onLoad: function () {

    var that = this;

    that.canvas = wx.createCanvasContext("image-canvas", that)

    that.canvas.drawImage(that.data.src, 0, 0, that.data.clientwidth, that.data.clientheight)

    that.canvas.draw()

  }

})

wxml:

<canvas canvas-id="image-canvas" style='width:{{clientidth}}px; height:{{clientHeight}}px;'></canvas>