Promise在await报错后，如何继续往下跑...

 一、resolve

当a>0时，正常情况依次输出A、B、C

1console.log("A");
2	let result = await this.test();
3	console.log("C:",result);
4
5	private  test(){
6		return new Promise((resolve,reject)=>{
7			console.log("B");
8			let a = 3;
9			if(a > 0){
10				resolve(a);
11			}else{
12				reject(0);
13			}
14		});
15	}

二、没有处理失败信息，导致程序无法继续执行

当a<0时。输出A、B后，C无法输出，程序无法继续往下执行。

1console.log("A");
2	let result = await this.test();
3	console.log("C:",result);
4
5	private  test(){
6		return new Promise((resolve,reject)=>{
7			console.log("B");
8			let a = -3;
9			if(a > 0){
10				resolve(a);
11			}else{
12				reject(0);
13			}
14		});
15	}

三、catch

增加catch处理错误，程序可以继续执行

1console.log("A");
2	let result = await this.test();
3	console.log("C:",result);
4
5	private  test(){
6		return new Promise((resolve,reject)=>{
7			console.log("B");
8			let a = -3;
9			if(a > 0){
10				resolve(a);
11			}else{
12				reject(0);
13			}
14		}).catch((err)=>{
15			console.log("err:", err);
16		});
17	}

这样也可以

let result = await this.test().catch(()=>{});

四、使用then处理错误，程序继续执行

 换一种写法，使用then。

1console.log("A");
2	let result = await this.test().then((res)=>{
3		console.log("success:", res);
4	},(res)=>{
5		console.log("fail:", res);
6	});
7	console.log("C:",result);
8
9
10	private  test(){
11		return new Promise((resolve,reject)=>{
12			console.log("B");
13			let a = -3;
14			if(a > 0){
15				resolve(a);
16			}else{
17				reject(0);
18			}
19		});
20	}

五、在await处使用catch，程序继续执行

1protected async createGameScene() {
2        console.log("A");
3        let result = await this.test().catch((err)=>{console.log("err:",err)});
4        console.log("C:",result);
5    }
6
7    private  test(){
8        return new Promise((resolve,reject)=>{
9            console.log("B");
10            let a = -3;
11            if(a > 0){
12                resolve(a);
13            }else{
14                reject(0);
15            }
16        });
17    }

六、在test里catch后，程序会不执行then的reject，而是resolve。

1protected async createGameScene() {
2        console.log("A");
3       let result = await this.test().then((res)=>{
4           console.log("C:",res);
5       },(res)=>{
6           console.log("D:",res)
7       }).catch((err)=>{console.log("E:",err)});
8    console.log("F:",result);
9    }
10
11    private  test(){
12        return new Promise((resolve,reject)=>{
13            console.log("B");
14            let a = -3;
15            if(a > 0){
16                resolve(a);
17            }else{
18                reject(0);
19            }
20        }).catch((err)=>{console.log("test err:", err)});
21    }