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| 1 | +class ResourceManager { |
| 2 | + private resources: Map<string, any[]> = new Map(); |
| 3 | + private eventListeners: { [key: string]: EventListener } = {}; |
| 4 | + |
| 5 | + constructor() { |
| 6 | + // 创建大量事件监听器但没有清理机制 |
| 7 | + window.addEventListener('resize', this.handleResize); |
| 8 | + document.addEventListener('click', this.handleClick); |
| 9 | + |
| 10 | + // 启动定时器但没有清理 |
| 11 | + setInterval(this.collectData, 1000); |
| 12 | + } |
| 13 | + |
| 14 | + private handleResize = () => { |
| 15 | + // 每次窗口大小变化时,都添加新数据到资源中但从不清理 |
| 16 | + const newData = new Array(10000).fill(0).map(() => ({ |
| 17 | + id: Math.random().toString(), |
| 18 | + value: new Array(1000).fill('large string data'), |
| 19 | + })); |
| 20 | + |
| 21 | + this.resources.set(`resize_${Date.now()}`, newData); |
| 22 | + console.log('Added new resize data'); |
| 23 | + }; |
| 24 | + |
| 25 | + private handleClick = (event: MouseEvent) => { |
| 26 | + // 为每个点击创建一个新闭包,捕获点击事件但从不释放 |
| 27 | + const clickData = { x: event.clientX, y: event.clientY, timestamp: Date.now() }; |
| 28 | + |
| 29 | + const element = document.getElementById('tracking-area'); |
| 30 | + if (element) { |
| 31 | + // 创建新的事件监听器但从不移除旧的 |
| 32 | + const listener = () => { |
| 33 | + console.log('Processing click data:', clickData); |
| 34 | + }; |
| 35 | + |
| 36 | + element.addEventListener('mouseover', listener); |
| 37 | + this.eventListeners[`click_${Date.now()}`] = listener; |
| 38 | + } |
| 39 | + }; |
| 40 | + |
| 41 | + private collectData = () => { |
| 42 | + // 定期收集数据但从不清理 |
| 43 | + const largeData = new Array(5000).fill(0).map(() => new Uint8Array(1024)); |
| 44 | + this.resources.set(`data_${Date.now()}`, largeData); |
| 45 | + }; |
| 46 | + |
| 47 | + // 缺少析构函数或清理方法来移除事件监听器和释放资源 |
| 48 | +} |
| 49 | + |
| 50 | +// 创建实例但从不销毁 |
| 51 | +let manager: ResourceManager | null = new ResourceManager(); |
| 52 | + |
| 53 | +// 模拟单页应用路由变化,但没有清理旧的资源管理器 |
| 54 | +function navigateToNewPage() { |
| 55 | + // 创建新的管理器,但没有清理旧的 |
| 56 | + manager = new ResourceManager(); // 旧的manager实例仍然存在,但已经无法访问 |
| 57 | +} |
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