ZhangXianQiang
2024-03-29 fd9a2a05829f84dd3925da8fabec901498ebb9e0
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import EventEmitter from "./eventEmitter";
export default class Time extends EventEmitter {
    constructor() {
        super();
        this.start = Date.now();
        this.current = this.start;
        this.elapsed = 0;
        this.delta = 16;
        window.requestAnimationFrame(() => {
            this.tick();
        });
    }
 
    tick() {
        const currentTime = Date.now();
        this.delta = currentTime - this.current;
        this.current = currentTime;
        this.elapsed = this.current - this.start;
        this.trigger('tick');
        
        window.requestAnimationFrame(() => {
            this.tick();
        });
    }
}