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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | 148x 148x 4047x 1174x 4047x | // 参考 https://juejin.cn/post/6844903843860316167 export default class KeyMap { constructor() { this.map = new WeakMap(); this.count = 0 } getKey(obj) { if (!this.map.has(obj)) { this.map.set(obj, this.count++); } return this.map.get(obj); } } |