uni-app学习笔记之js异常处理try-catch-finally流程

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1. 无finally或者finally不带return的情况下,try顺利执行则返回try—ok

			testFunc() {var res = this.demo()console.log(res);},demo() {try {var x = "ok"if (x == "err") throw "ERROR";return '1---ok';} catch (e) {console.log(e);return '2---err';} finally {console.log('finally');// return '3---finally';}return '4---end';}

21:14:33.940 finally  at pages/test/test.vue:28
21:14:33.958 1---ok  at pages/test/test.vue:17

2. 无finally或者finally不带return的情况下,try抛出异常则返回catch—err

			testFunc() {var res = this.demo()console.log(res);},demo() {try {var x = "err"if (x == "err") throw "ERROR";return '1---ok';} catch (e) {console.log(e);return '2---err';}finally {console.log('finally');// return '3---finally';}return '4---end';}

21:22:09.763 ERROR  at pages/test/test.vue:25
21:22:09.769 finally  at pages/test/test.vue:29
21:22:09.773 2---err  at pages/test/test.vue:17

3. 只要finally带上return,优先级高于其他任何return,必然返回3—finally

			testFunc() {var res = this.demo()console.log(res);},demo() {try {var x = "err"if (x == "err") throw "ERROR";return '1---ok';} catch (e) {console.log(e);return '2---err';}finally {console.log('finally');return '3---finally';}return '4---end';}

21:25:13.191 ERROR  at pages/test/test.vue:25
21:25:13.197 finally  at pages/test/test.vue:29
21:25:13.202 3---finally  at pages/test/test.vue:17

总结:

不带finally的try—catch异常处理双return模式,返回值可以对流程处理进行判断

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