- uni.chooseImage...
- uni.getImageInfo({
- src: res.tempFilePaths[0],
- success: (res) => {
- const blobUrl = res.path;
- const canvas = document.createElement("canvas");
- // 减少绘制的大小才能压缩,不然可能压缩后图片会变大
- canvas.width = res.width / 2;
- canvas.height = res.height / 2;
- const ctx = canvas.getContext("2d");
- let img = new Image();
- img.src = blobUrl;
- img.error = uni.hideLoading;
- img.onload = () => {
- ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
- const contentType = "image/png";
- canvas.toBlob(
- async (blob) => {
- const blobUrl2 = window.URL.createObjectURL(blob);
- await _upload(blobUrl2); // 使用uniapp的文件上传api发送FormData数据
- window.URL.revokeObjectURL(blobUrl2);
- img = null;
- },
- contentType,
- 0.5
- );
- };
- },
- fail: uni.hideLoading,
- });