js 简单的单例写法
话不多说，上代码
let instance = null;
class TClass {
public a: string;
constructor(str) {
if (!instance) { // singleton-design pattern
instance = this;
}
instance.a = str;
return instance;
}
}
// ------------------------------------------------
test('singleton-design test', t => {
const a = new TClass('3');
const b = new TClass('4');
t.is(a.a, '4')
t.is(a, b)
})
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