From dc116f10ef8f6cbfacf83659ec734abae9d409b0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?LAPTOP-D7TKRI82=5C=E9=82=93?= <52643018@qq.com>
Date: Wed, 25 Aug 2021 17:10:59 +0800
Subject: [PATCH] =?UTF-8?q?[=E6=96=B0=E5=A2=9E]=20H5=20base64=E8=BD=AC?=
 =?UTF-8?q?=E5=9B=BE=E7=89=87=E7=9A=84=E6=96=B9=E6=B3=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 common/base64ToImage.js | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 common/base64ToImage.js

diff --git a/common/base64ToImage.js b/common/base64ToImage.js
new file mode 100644
index 0000000..47d5b2b
--- /dev/null
+++ b/common/base64ToImage.js
@@ -0,0 +1,35 @@
+// base64 转为文件类型
+function dataURLtoFile(dataurl, filename = 'file') {
+  let arr = dataurl.split(',')
+  let mime = arr[0].match(/:(.*?);/)[1]
+  let suffix = mime.split('/')[1]
+  let bstr = atob(arr[1])
+  let n = bstr.length
+  let u8arr = new Uint8Array(n)
+  
+  while (n--) {
+	u8arr[n] = bstr.charCodeAt(n)
+  }
+  return new File([u8arr], `${filename}.${suffix}`, {
+	type: mime
+  })
+}
+
+
+// 转成图片文件,使用时可以这样传参进入
+// var imgFile = dataURLtoFile(base64Img); 
+
+
+// 预览转出来的文件
+function previewImageFile(imgFile){
+	const fileReader = new FileReader();  // 创建一个 fileReader
+	fileReader.readAsDataURL(imgFile); // 将生成的图片文件读到 fileReader中
+	const img = new Image();
+	img.src = fileReader.result; // 将 fileReader.result 设置为 图片的 src
+	document.body.appendChild(img);
+}
+
+module.exports = {
+	dataURLtoFile,
+	previewImageFile
+}