1.0.0

common/image.js

@@ -0,0 +1,76 @@
+// 读取图片 Base64 内容
+export function TaImageToBase64(file, maxw = 500) {
+	return new Promise((resolve, reject) => {
+		if (uni.compressImage) {
+			uni.compressImage({
+				src: file,
+				quality: 80,
+				width: maxw + "px",
+				fail: err => reject(err),
+				success: res =>
+					readFileAsBase64(res.tempFilePath)
+					.then(resolve)
+					.catch(reject)
+			})
+		} else {
+			let img = new Image();
+			(img.crossOrigin = "Anonymous"),
+			(img.onload = () => {
+				let c = document.createElement("canvas")
+				let w = img.naturalWidth,
+					h = img.naturalHeight;
+				(c.width = Math.min(maxw, w)), (c.height = c.width * (h / w))
+				// @ts-ignore
+				c.getContext("2d").drawImage(img, 0, 0, c.width, c.height)
+				resolve(c.toDataURL("image/jpeg", 0.8))
+			}),
+			(img.src = file),
+			(img.onerror = () => reject(new Error("Failed to load image")))
+		}
+	})
+
+	// 读取文件为 base64 格式
+	function readFileAsBase64(file) {
+		return new Promise((resolve, reject) => {
+			let rd = new plus.io.FileReader()
+			rd.onerror = e => reject(e)
+			rd.onloadend = v => resolve(v.target.result)
+			// @ts-ignore
+			rd.readAsDataURL(plus.io.convertLocalFileSystemURL(file))
+		})
+	}
+}
+
+// 下载图片到本地
+export function TaImageDownload(imgUrl, name = "") {
+	return new Promise((resolve, reject) => {
+		// #ifdef H5
+		const link = document.createElement("a")
+		link.href = imgUrl
+		link.download =
+			name ||
+			Math.random()
+			.toString()
+			.replace("0.", "img") + `.png`
+		link.style.display = "none"
+		document.body.appendChild(link)
+		link.click()
+		document.body.removeChild(link)
+		resolve(true)
+		// #endif
+
+		// #ifndef H5
+		uni.downloadFile({
+			url: imgUrl,
+			success: ret => {
+				if (ret.statusCode === 200)
+					uni.saveImageToPhotosAlbum({
+						filePath: ret.tempFilePath,
+						fail: err => TaToast.error("保存失败！", err).then(reject),
+						success: () => TaToast.success("保存成功！").then(resolve)
+					})
+			}
+		})
+		// #endif
+	})
+}