javascript创建可复用组件的核心是封装和抽象。1) 通过类封装组件逻辑和dom操作,如按钮组件。2) 内部状态管理使用闭包或私有属性,如计数器组件。3) 性能优化通过最小化dom操作,如优化计数器组件。这样可以提升代码的可读性、可维护性和效率。
class Button { constructor(text, onClick) { this.text = text; this.onClick = onClick; this.element = document.createElement('button'); this.element.textContent = this.text; this.element.addEventListener('click', this.onClick); } render() { return this.element; } } // 使用示例 const myButton = new Button('Click me', () => console.log('Button clicked!')); document.body.appendChild(myButton.render());
class Counter { constructor() { this.count = 0; this.element = document.createElement('div'); this.element.textContent = `Count: ${this.count}`; this.incrementButton = new Button('Increment', () => this.increment()); this.decrementButton = new Button('Decrement', () => this.decrement()); this.element.appendChild(this.incrementButton.render()); this.element.appendChild(this.decrementButton.render()); } increment() { this.count++; this.updateDisplay(); } decrement() { this.count--; this.updateDisplay(); } updateDisplay() { this.element.textContent = `Count: ${this.count}`; } render() { return this.element; } } // 使用示例 const counter = new Counter(); document.body.appendChild(counter.render());
class OptimizedCounter { constructor() { this.count = 0; this.element = document.createElement('div'); this.textElement = document.createElement('span'); this.textElement.textContent = `Count: ${this.count}`; this.element.appendChild(this.textElement); this.incrementButton = new Button('Increment', () => this.increment()); this.decrementButton = new Button('Decrement', () => this.decrement()); this.element.appendChild(this.incrementButton.render()); this.element.appendChild(this.decrementButton.render()); } increment() { this.count++; this.updateDisplay(); } decrement() { this.count--; this.updateDisplay(); } updateDisplay() { this.textElement.textContent = `Count: ${this.count}`; } render() { return this.element; } } // 使用示例 const optimizedCounter = new OptimizedCounter(); document.body.appendChild(optimizedCounter.render());
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