48 lines
1.1 KiB
TypeScript
48 lines
1.1 KiB
TypeScript
/*
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实例：
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汤宝宝成为了收银员，消费者可以使用现金或者支付宝支付。
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*/
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interface Strategy {
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pay(amount: number): string;
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}
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class CashStrategy implements Strategy {
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pay(amount: number): string {
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return `使用现金支付了${amount.toFixed(2)}元`;
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}
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}
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class AlipayStrategy implements Strategy {
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pay(amount: number): string {
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return `使用支付宝支付了${amount.toFixed(2)}元`;
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}
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}
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class Context {
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private strategy: Strategy| null = null;
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setStrategy(strategy: Strategy) {
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this.strategy = strategy;
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}
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pay(amount: number): string {
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if (!this.strategy) {
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throw new Error("支付策略未设置");
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}
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return this.strategy.pay(amount);
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}
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}
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(function(){
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console.log("=========== 策略模式 ===========")
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const context = new Context();
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context.setStrategy(new CashStrategy());
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console.log(context.pay(100));
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context.setStrategy(new AlipayStrategy());
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console.log(context.pay(200));
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console.log("\n========= 策略模式结束 =========")
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})() |