init git

assets/FishSingle/script/engine/utils/BitUtil.ts

@@ -0,0 +1,52 @@
+import { _decorator } from 'cc'
+const { ccclass, property } = _decorator
+
+import { Logger } from './Logger'
+
+@ccclass('BitUtil')
+export default class BitUtil {
+	//index是二进制从右到左
+	public static isBitSet(value: number, index: number): boolean {
+		let str: string = value.toString(2)
+		if (parseInt(str[str.length - 1 - index]) == 1) {
+			return true
+		}
+		return false
+	}
+
+	//从右到左计算
+	public static setBitValue(value: number, index: number): number {
+		let newValue: number = value
+		let str: string = value.toString(2)
+		let newStr: string = ''
+		let maxIndex = Math.max(str.length - 1, index)
+		for (let i = 0; i <= maxIndex; i++) {
+			if (index == i) {
+				newStr = '1' + newStr
+			} else {
+				if (str[i] == undefined) {
+					newStr = '0' + newStr
+				} else {
+					newStr = str[i] + newStr
+				}
+			}
+		}
+		newValue = parseInt(newStr, 2)
+		return newValue
+	}
+
+	public static clearBitValue(value: number, index: number) {
+		let newValue: number = value
+		let str: string = value.toString(2)
+		let newStr: string = ''
+		for (let i = str.length - 1; i >= 0; i--) {
+			if (index == str.length - 1 - i) {
+				newStr = '0' + newStr
+			} else {
+				newStr = str[i] + newStr
+			}
+		}
+		newValue = parseInt(newStr, 2)
+		return newValue
+	}
+}