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share.html
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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>用剪切板和BASE64传输文件</title>
<style>
* {
padding: 0;
margin: 0;
}
.container {
width: 400px;
margin: 0 auto;
}
.nav {
display: flex;
justify-content: space-around;
border-bottom: 1px solid #dcdfe6;
}
.nav-item {
color: #1989fa;
opacity: 0.5;
padding: 15px 10px;
cursor: pointer;
user-select: none;
}
.active {
opacity: 1;
border-bottom: #1989fa 3px solid;
font-weight: bold;
}
.upload-file-button-group {
display: flex;
justify-content: space-between;
margin: 20px 0;
}
.action-button {
display: inline-block;
background-color: #409eff;
color: white;
padding: 7px 16px;
border-radius: 20px;
cursor: pointer;
/* margin-right: 20px; */
user-select: none;
}
.copy-button {
background-color: rgb(236, 245, 255);
/* opacity: 0.6; */
color: #409eff;
border: #409eff 1px solid;
}
#base64-result {
border: 3px solid rgb(192, 189, 189);
height: 200px;
word-wrap: break-word;
overflow: auto;
}
.placeholder-text {
color: rgb(192, 189, 189);
margin-top: 20px;
}
.filename-input,
#download-file-base64 {
outline-style: none;
border: 1px solid #ccc;
border-radius: 3px;
padding: 6px;
font-size: 14px;
width: 100%;
margin: 10px 0;
box-sizing: border-box;
}
.filename-input:focus,
#download-file-base64:focus {
border-color: #66afe9;
outline: 0;
-webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
0 0 8px rgba(102, 175, 233, 0.6);
box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
0 0 8px rgba(102, 175, 233, 0.6);
}
.download-button-area {
display: flex;
justify-content: center;
}
#download-button {
width: 120px;
display: flex;
justify-content: center;
}
</style>
</head>
<body>
<div class="container">
<div class="nav">
<div
id="show-upload-file-page-button"
class="nav-item active"
onclick="showUploadFile()"
>
上传文件
</div>
<div
id="show-download-file-page-button"
class="nav-item"
onclick="showDownloadFile()"
>
下载文件
</div>
</div>
<!-- <hr /> -->
<div class="operation-area">
<div id="file-to-base64">
<div class="upload-file-button-group">
<div
class="action-button choose-file-button"
onclick="handleUploadFileButtonClick()"
>
选择文件
</div>
<div onclick="copyResult()" class="action-button copy-button">
复制结果
</div>
</div>
<input
type="file"
name=""
id="upload-file-input"
style="display: none"
/>
<!-- <h3>上传结果</h3> -->
<div id="base64-result">
<span class="placeholder-text">上传结果</span>
</div>
<div class="usage">
使用说明：
<p></p>
理论上来说本工具的文件大小限制就是系统、浏览器、剪切板的长度限制，但是实际使用中文件过大很容易造成网页应用崩溃，经过多次实践发现3M左右是比较合适的单文件大小，如果有更大的文件可以分卷压缩后传输
</div>
</div>
<div id="base64-to-file" style="display: none">
<input
class="filename-input"
type="text"
id="file-name"
placeholder="请输入文件名"
/>
<textarea
name=""
id="download-file-base64"
cols="30"
rows="10"
placeholder="请将文件base64编码粘贴在这里"
></textarea>
<div class="download-button-area">
<div
onclick="downloadFileByBase64()"
id="download-button"
class="action-button"
>
下载
</div>
</div>
<div class="usage">
使用说明：
<p></p>
1.如果输入完整的文件名，下载的文件就以输入的文件名为准
<p></p>
2.如果只输入了文件名没有文件类型后缀，会根据BASE64中的文件类型信息尽可能自动添加后缀
<p></p>
3.如果不输入文件名，文件名将会是
"下载文件"+当前时间戳，文件后缀会根据BASE64中的文件类型信息尽可能自动添加后缀
</div>
</div>
</div>
</div>
<script>
var uploadResult = "";
function showUploadFile() {
document.getElementById("file-to-base64").style.display = "block";
document.getElementById("base64-to-file").style.display = "none";
document
.getElementById("show-upload-file-page-button")
.classList.add("active");
document
.getElementById("show-download-file-page-button")
.classList.remove("active");
}
function showDownloadFile() {
document.getElementById("file-to-base64").style.display = "none";
document.getElementById("base64-to-file").style.display = "block";
document
.getElementById("show-upload-file-page-button")
.classList.remove("active");
document
.getElementById("show-download-file-page-button")
.classList.add("active");
}
function handleUploadFileButtonClick() {
document.getElementById("upload-file-input").click();
}
document.getElementById("upload-file-input").onchange = function () {
var fileReader = new FileReader();
fileReader.readAsDataURL(this.files[0]);
fileReader.onload = function () {
uploadResult = fileReader.result;
document.getElementById("base64-result").innerHTML =
fileReader.result;
copyResult();
};
};
function dataURLtoFile(dataurl, filename) {
//将base64转换为文件
var arr = dataurl.split(","),
mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]),
n = bstr.length,
u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
return new File([u8arr], filename, { type: mime });
}
function dataURLtoBlob(dataurl) {
var arr = dataurl.split(","),
mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]),
n = bstr.length,
u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
return new Blob([u8arr], { type: mime });
}
function downloadFile(url, name) {
var a = document.createElement("a");
a.setAttribute("href", url);
a.setAttribute("download", name);
a.setAttribute("target", "_blank");
let clickEvent = document.createEvent("MouseEvents");
clickEvent.initEvent("click", true, true);
a.dispatchEvent(clickEvent);
}
function downloadFileByBase64() {
let base64 = document.getElementById("download-file-base64").value;
if (base64.trim() === "") return alert("请先粘贴文件的BASE64编码");
let fileName = document.getElementById("file-name").value;
if (fileName.trim() == "") {
fileName = "下载文件" + new Date().valueOf();
}
var myBlob = dataURLtoBlob(base64);
var myUrl = URL.createObjectURL(myBlob);
downloadFile(myUrl, fileName);
}
function copyResult() {
if (uploadResult.trim() === "") {
alert("请先上传文件");
} else {
if (navigator.clipboard) {
// clipboard api 复制
navigator.clipboard.writeText(uploadResult);
} else {
var textarea = document.createElement("textarea");
document.body.appendChild(textarea);
// 隐藏此输入框
textarea.style.position = "fixed";
textarea.style.clip = "rect(0 0 0 0)";
textarea.style.top = "10px";
// 赋值
textarea.value = uploadResult;
// 选中
textarea.select();
// 复制
document.execCommand("copy", true);
// 移除输入框
document.body.removeChild(textarea);
}
}
}
</script>
</body>
</html>