let bgUrl = ''
// canvas绘制网络图片需保存至本地
wx.getImageInfo({
src: '',//服务器返回的图片地址
success: function (res) {
console.log(res);
bgUrl = res.Path
},
fail: function (res) {
console.log(res);
}
});
ctx.drawImage(bgUrl, 0, 0, wigth, height);
相关问题
相关文档
- Canvas.cancelAnimationFrame: 小程序/开发/API/画布/Canvas/Canvas.cancelAnimationFrame
- Canvas.cancelAnimationFrame#参数: 小程序/开发/API/画布/Canvas/Canvas.cancelAnimationFrame
- Canvas.cancelAnimationFrame#功能描述: 小程序/开发/API/画布/Canvas/Canvas.cancelAnimationFrame
- Canvas.createImage: 小程序/开发/API/画布/Canvas/Canvas.createImage
- Canvas.toDataURL: 小程序/开发/API/画布/Canvas/Canvas.toDataURL
wx.getImageInfo({src: 'https://云存储的下载地址/signin/signin_01.png?sign=031a219531cc9a146d34f18cef76ac0a&t=1616849572',//服务器返回的图片地址success: function (res) {bgUrl = res.Pathctx.drawImage(bgUrl, 0, 0, wigth, height);ctx.save();},fail: function (res) {console.log(res);}});wx.getImageInfo 是异步调用啊，你这图片信息还没获取到就开始绘制了，当然绘制不出来了。 wx.getImageInfo({ src: '',//服务器返回的图片地址 success: function (res) { console.log(res); bgUrl = res.Path ctx.drawImage(bgUrl, 0, 0, wigth, height); }, fail: function (res) { console.log(res); } }); 这样再试试