[TS]闭包测试

class sss
{
    public name = "emiya";
    constructor(){
        console.log("new sss");
    }
    private test()
    {
        let nowName = this.name;
        setTimeout(() => {
            console.log(this);
            console.log(nowName);
            this.name = nowName;
            console.log("now is old nowName");
        }, 1000);
    }

    public ss(){
        this.test();
        console.log("change name wisdom");
        this.name = "wisdom";
        this.test();
        setTimeout(() => {
            console.log(this.name);
        }, 3000);
    }
}

let s = new sss();
s.ss();
s = null;

　　运行结果如下：

[Running] ts-node "c:\Users\11418\Desktop\class sss.ts"
new sss
change name wisdom
sss { name: 'wisdom' }
emiya
now is old nowName
sss { name: 'emiya' }
wisdom
now is old nowName
wisdom

　　

最开始nowName临时变量被赋值emiya，由于闭包数据一直留着。之后name被切换成wisdom。计时器1s到了后匿名函数输出之前存的临时变量，值为emiya，再向上寻找到this（name在1s前被改）。之后输出类似，最后name被改为wisdom