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32 lines
651 B
32 lines
651 B
/** |
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* 饿汉模式 |
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* 特点：类加载时就初始化。 |
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*/ |
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class SingletonMode1 { |
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private static instance = new SingletonMode1() |
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// 将 constructor 设为私有属性，防止 new 调用 |
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private constructor() { } |
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static getInstance(): SingletonMode1 { |
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return this.instance |
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} |
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} |
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/** |
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* 懒汉模式 |
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* 特点：需要时才创建对象实例。 |
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*/ |
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class SingletonMode2 { |
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private static instance: SingletonMode2 |
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private constructor() { } |
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static getInstance(): SingletonMode2 { |
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if (!this.instance) { |
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this.instance = new SingletonMode2() |
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} |
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return this.instance |
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} |
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} |