无法在image标签里显示的代码

    1. ctx.drawImage("/" + resp.path, 175, imgH - 370, 250, 250);
    2. ctx.draw();
    4. wx.canvasToTempFilePath({
    5.   canvasId: "myCanvas",
    6.   success: res => {
    7.     console.log("合成的带有小程序码的图片success》》》", res);
    8.     let tempFilePath = res.tempFilePath;
    9.     this.resultImg = tempFilePath; // image标签获取图片路径
    10.   },
    11.   fail: e => {
    12.       console.log(e);
    13.   }
    14. });

    无法显示的原因：异步执行
    解决办法

    1. ctx.drawImage("/" + resp.path, 175, imgH - 370, 250, 250);
    2. ctx.draw(false, () => {
    3.   wx.canvasToTempFilePath({
    4.     canvasId: "myCanvas",
    5.     success: res => {
    6.     console.log("合成的带有小程序码的图片success》》》", res);
    7.     let tempFilePath = res.tempFilePath;
    8.     this.resultImg = tempFilePath;
    9.   },
    10.   fail: e => {
    11.       console.log(e);
    12.   }
    13.   });
    14. });