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mail-vue/src/utils/file-utils.js

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+export function getExtName(fileName) {
+    const index = fileName.lastIndexOf('.')
+    return index !== -1 ? fileName.slice(index + 1).toLowerCase() : ''
+}
+
+export function formatBytes(bytes) {
+    if (bytes === 0) return '0 B';
+    const k = 1024;
+    const units = ['B', 'KB', 'MB', 'GB', 'TB'];
+    const i = Math.floor(Math.log(bytes) / Math.log(k));
+    const size = (bytes / Math.pow(k, i)).toFixed(2);
+    return `${size} ${units[i]}`;
+}