增加base64压缩与解压的算法

utils/util.js

@@ -200,3 +200,34 @@ export const rpx = () => {
 export const rpx2px = (num) => {
   return num * rpx()
 }
+
+
+// uint8array转为base64字符串
+export const uint8arrayToBase64(u8Arr) {
+    let CHUNK_SIZE = 0x8000; //arbitrary number
+    let index = 0;
+    let length = u8Arr.length;
+    let result = '';
+    let slice;
+    while (index < length) {
+        slice = u8Arr.subarray(index, Math.min(index + CHUNK_SIZE, length));
+        result += String.fromCharCode.apply(null, slice);
+        index += CHUNK_SIZE;
+    }
+    // web image base64图片格式: "data:image/png;base64," + b64encoded;
+    // return  "data:image/png;base64," + btoa(result);
+    return btoa(result);
+}
+// base64字符串转为uint8array数组
+export const base64ToUint8Array(base64String) {
+    let padding = '='.repeat((4 - base64String.length % 4) % 4);
+    let base64 = (base64String + padding)
+        .replace(/\-/g, '+')
+        .replace(/_/g, '/');
+    let rawData = window.atob(base64);
+    let outputArray = new Uint8Array(rawData.length);
+    for (var i = 0; i < rawData.length; ++i) {
+        outputArray[i] = rawData.charCodeAt(i);
+    }
+    return outputArray;
+}