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