init git

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

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+import { Vec2, _decorator } from 'cc'
+export default class RandomUtil {
+	//随机minNum到maxNum的数字 （包含maxNum）
+	public static nextInt(minNum: number, maxNum: number) {
+		return Math.floor(Math.random() * (maxNum - minNum + 1) + minNum)
+	}
+
+	public static nextNumber(minNum: number, maxNum: number) {
+		return Math.random() * (maxNum - minNum) + minNum
+	}
+
+	public static nextSign() {
+		let temp = Math.random()
+		if (temp < 0.5) {
+			return 1
+		}
+		return -1
+	}
+
+	public static nextBoolean() {
+		let temp = Math.random()
+		if (temp < 0.5) {
+			return true
+		}
+		return false
+	}
+
+	public static randomArr(nowArr: Array<any>, needNum: number) {
+		let tempArr: Array<any> = nowArr.concat()
+		let resultArr: Array<any> = []
+		for (let index = 0; index < needNum; index++) {
+			if (tempArr.length <= 0) {
+				break
+			}
+			let randomIndex: number = RandomUtil.nextInt(0, tempArr.length - 1)
+			resultArr.push(tempArr.splice(randomIndex, 1)[0])
+		}
+		return resultArr
+	}
+
+	public static randomItem(nowArr: Array<any>) {
+		return this.randomArr(nowArr, 1)[0]
+	}
+
+	public static randomP(left: number, right: number, up: number, down: number) {
+		let randomX: number = RandomUtil.nextNumber(left, right)
+		let randomY: number = RandomUtil.nextNumber(up, down)
+		return new Vec2(randomX, randomY)
+	}
+}