Initial project

src/utils/IOSize.ts

@@ -0,0 +1,80 @@
+export enum Unit {
+
+	/** B */
+	B = "B",
+
+	/** KB */
+	KB = "KB",
+
+	/** MB */
+	MB = "MB",
+
+	/** GB */
+	GB = "GB",
+
+	/** TB */
+	TB = "TB",
+
+	/** PB */
+	PB = "PB",
+
+	/** EB */
+	EB = "EB"
+}
+
+/** 储存单位 */
+export default class IOSize {
+
+	/** 1 字节 */
+	public static BYTE = 1;
+
+	/** 1 KB */
+	public static KB = IOSize.BYTE << 10;
+
+	/** 1 MB */
+	public static MB = IOSize.KB << 10;
+
+	/** 1 GB */
+	public static GB = IOSize.MB << 10;
+
+	/** 1 TB */
+	public static TB = IOSize.GB << 10;
+
+	/** 1 PB */
+	public static PB = IOSize.TB << 10;
+
+	/** 1 EB */
+	public static EB = IOSize.PB << 10;
+
+	public static Unit = Unit;
+
+	/**
+	 * <p>格式化一个储存容量，保留两位小数
+	 * <pre>
+	 *     // 返回 100.01 KB
+	 *     format(102411, 2);
+	 * </pre>
+	 *
+	 * @param size     字节大小
+	 * @param fixed    保留小数
+	 * @param stopUnit 停止单位
+	 * @return
+	 */
+	public static format(size: number, fixed = 2, stopUnit?: Unit): string {
+		const units = Object.keys(Unit);
+		if (0 < size) {
+			for (let i = 0; i < units.length; i++, size /= 1024) {
+				const unit = units[i];
+				if (size <= 1000 || i === units.length - 1 || unit === stopUnit) {
+					if (i === 0) {
+						// 最小单位不需要小数
+						return size + " B";
+					} else {
+						return `${size.toFixed(fixed)} ${unit}`;
+					}
+				}
+			}
+		}
+		return "0 B";
+	}
+}