Chrome 开发工具 - JavaScript 代码段测试：最后一行出现"Uncaught Syntax Unexpected End-of-input"错误

Question

我正在尝试使用 Chrome 开发工具测试以下代码片段，但我在代码片段的最后一行收到此错误......找不到哪里不对...

function myPromise1(time1, ok1){
return new Promise((resolve, reject) => {
// do stuff 1 async
setTimeout(() => {
if ( ok1 ) {
resolve('stuff-1 worked')
} else {
reject(Error('stuff-1 failed'))
}
}, time1)
});
function myPromise2(time2, ok2){
return new Promise((resolve, reject) => {
// do stuff 2 async
setTimeout(() => {
if ( ok2 ) {
resolve('stuff-2 worked')
} else {
reject(Error('stuff-2 failed'))
}
}, time2)
});
function myPromise3(time3, ok3){
return new Promise((resolve, reject) => {
// do stuff 3 async
setTimeout(() => {
if ( ok3 ) {
resolve('stuff-3 worked')
} else {
reject(Error('stuff-3 failed'))
}
}, time3)
});
const c1 = '';
const c2 = '';
const c3 = '';
const promise1 = (val11, val12) => myPromise1(val11, val12)
.then(p1Result => {
c1 = p1Result;
return;
}, function(err1) {
console.log('Error: ', err1);
return;
});
const promise2 = (val21, val22) => myPromise2(val21, val22)
.then((p2Result) => {
c2 = p2Result;
return;
}, function(err2) {
console.log('Error: ', err2);
return;
});
const promise3 = (val31, val32) => myPromise2(val31, val32)
.then((p3Result) => {
c3 = p3Result;
return;
}, function(err3) {
console.log('Error: ', err3);
return;
});
const conditionalPromiseFlow = (...fns) => {
if(fns.length === 0) return Promise.resolve()
const [next] = fns;
return next()
.then(result => {
if(result) {
return conditional(...fns.slice(1));
}
return result;
})
}
conditionalPromiseFlow(() => promise1(1000, true), () => promise2(2000, true), () => promise3(3000, true))
.then(() => {
console.log('Status 200 - ALL DONE');
return;
})
.catch((error) => {
console.log('Status ', error.status, ' - ', error.message);
return;
})  <== Error stated here

Answer 1

这是测试承诺流的更正片段... 我可以玩主((线

conditionalPromiseFlow(() => promise1(1000, true), () => promise2(2000, true), () => promise3(3000, true))

当一个承诺被拒绝时，流将停止

function myPromise1(time1, ok1){
console.log('Promise1', time1, ok1);
return new Promise((resolve, reject) => {
setTimeout(() => {
if ( ok1 ) {
resolve('stuff-1 worked');
} else {
reject(Error('stuff-1 failed'));
}
}, time1);
});
}
function myPromise2(time2, ok2){
console.log('Promise2', time2, ok2);
return new Promise((resolve, reject) => {
setTimeout(() => {
if ( ok2 ) {
resolve('stuff-2 worked');
} else {
reject(Error('stuff-2 failed'));
}
}, time2);
});
}
function myPromise3(time3, ok3){
console.log('Promise3', time3, ok3);
return new Promise((resolve, reject) => {
setTimeout(() => {
if ( ok3 ) {
resolve('stuff-3 worked');
} else {
reject(Error('stuff-3 failed'));
}
}, time3);
});
}
let c1 = '';
let c2 = '';
let c3 = '';
const promise1 = (val11, val12) => myPromise1(val11, val12)
.then(p1Result => {
c1 = p1Result;
return;
}, function(err1) {
err1.status = 300;
throw err1;
});
const promise2 = (val21, val22) => myPromise2(val21, val22)
.then((p2Result) => {
c2 = p2Result;
return;
}, function(err2) {
err2.status = 300;
throw err2;
});
const promise3 = (val31, val32) => myPromise3(val31, val32)
.then((p3Result) => {
c3 = p3Result;
return;
}, function(err3) {
err3.status = 300;
throw err3;
});
const conditionalPromiseFlow = (...fns) => {
if(fns.length === 0) return Promise.resolve();
const [next] = fns;
return next()
.then(result => {
if(!result) {
return conditionalPromiseFlow(...fns.slice(1));
}
return result;
});
};
conditionalPromiseFlow(() => promise1(1000, true), () => promise2(2000, true), () => promise3(3000, true))
.then(() => {
console.log('Status 200 - ALL DONE');
return;
})
.catch((error) => {
console.log('Status ', error.status, ' - ', error.message);
return;
});