Procfile
renzhezhilu
renzhezhilu
/ 文件离线or缓存到浏览器.js
Last active
May 7, 2020 18:17
[Cache_files_to_browser]#Uint8Array_to_text #text_to_Blob
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| function fileSaveLocal(fileUrl = 'https://cdn.jsdelivr.net/npm/[email protected]/dist/localforage.min.js', | |
| name = '未命名', | |
| type = 'text/txt') { | |
| let blobUrl = null | |
| let isHave = localStorage.getItem(name) | |
| function getData() { | |
| let txtData = localStorage.getItem(name) | |
| let u = new Uint8Array(JSON.parse(txtData)) | |
| let b = new Blob([u.buffer], { |
renzhezhilu
/ getImagesWidthHeight.js
Created
May 5, 2020 16:59
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| // 获取图片的宽和高 | |
| function getImagesWidthHeight(url = "blob | base64 | url") { | |
| return new Promise((ret) => { | |
| let img = new Image() | |
| img.src = url | |
| img.onload = function() { | |
| ret({ | |
| width: this.width, | |
| height: this.height, | |
| image: this |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>下载多个文件后打包成ZIP再下载</title> | |
| </head> | |
| <body> | |
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| //https://developer.mozilla.org/zh-CN/docs/Web/API/Body | |
| fetch(`https://xxxxxx`) | |
| .then(x=>{ | |
| return x.json() | |
| //x.text() | |
| //x.blob() | |
| //x.formData() | |
| //x.arrayBuffer() | |
| }).then(d=>{ |
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| function timeout(ms) { | |
| return new Promise((resolve, reject) => { | |
| setTimeout(resolve, ms, 'done'); | |
| }); | |
| } | |
| async function f (){ | |
| let d = await timeout(100) | |
| console.log('100After...') | |
| } |
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| //提取图片前缀 | |
| function findExactlyString(arr) { | |
| if (arr.length <= 1) return { | |
| leg: 0, | |
| str: '', | |
| diffArr: arr | |
| } | |
| let leg = 0 | |
| let arr00 = arr[0] | |
| for (let i = 0; i < arr00.length; i++) { |
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| //下载文件 | |
| // funDownload(JSON.stringify(xxxx),'xxx.json') | |
| function funDownload(content, filename) { | |
| let eleLink = document.createElement('a'); | |
| eleLink.download = filename; | |
| eleLink.style.display = 'none'; | |
| // 字符内容转变成blob地址 | |
| let blob = new Blob([content]); | |
| eleLink.href = URL.createObjectURL(blob); | |
| // 触发点击 |
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| //blob转base64 | |
| function blobToDataURI(blob, callback) { | |
| let reader = new FileReader(); | |
| reader.onload = function(e) { | |
| callback(e.target.result); | |
| } | |
| reader.readAsDataURL(blob); | |
| } | |
| //base64转blob | |
| function dataURItoBlob(dataURI) { |