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