为了理解 async/await，我尝试在 settimeout 运行并到期后显示一条控制台消息。如何修复下面的代码？我有 5 个 settimeout 函数，每个函数完成后都应显示各自的消息。
function t1(){
setTimeout(() => {
console.log("1")
}, 1000);
}
function t2(){
setTimeout(() => {
console.log("2")
}, 2000);
}
function t3(){
setTimeout(() => {
console.log("3")
}, 3000);
}
function t4(){
setTimeout(() => {
console.log("4")
}, 4000);
}
function t5(){
setTimeout(() => {
console.log("5")
}, 5000);
}
async function main(){
await t1();
console.log("1sec done");
await t2();
console.log("2sec done");
await t3();
console.log("3sec done");
await t4();
console.log("4sec done");
await t5();
console.log("Yay! I am all done");
}
main();
你应该使用Promises
function t1(){
return new Promise(function(resolve, reject) {
setTimeout(() => {
console.log("1");
resolve();
}, 1000);
});
}
function t2(){
return new Promise(function(resolve, reject) {
setTimeout(() => {
console.log("2");
resolve();
}, 1000);
});
}
function t3(){
return new Promise(function(resolve, reject) {
setTimeout(() => {
console.log("3");
resolve();
}, 1000);
});
}
function t4(){
return new Promise(function(resolve, reject) {
setTimeout(() => {
console.log("4");
resolve();
}, 1000);
});
}
function t5(){
return new Promise(function(resolve, reject) {
setTimeout(() => {
console.log("5");
resolve();
}, 1000);
});
}
async function main(){
await t1();
console.log("1sec done");
await t2();
console.log("2sec done");
await t3();
console.log("3sec done");
await t4();
console.log("4sec done");
await t5();
console.log("Yay! I am all done");
}
main();
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