一种通过async/await实现函数同步执行的方式

const testArr = [
() => {
return new Promise((resolve, reject) => {
setTimeout(()=> {
alert(1);
resolve();
}, 300);
});
},
() => {
return new Promise((resolve, reject) => {
setTimeout(()=> {
alert(2);
resolve();
}, 500);
});
},
() => {
return new Promise((resolve, reject) => {
setTimeout(()=> {
alert(3);
resolve();
}, 100);
});
}
];

async function iterate(arr) {
let index = 0;
while (index < arr.length - 1) {
await arr[index]();
index += 1;
}
return arr[index]();
}

iterate(testArr);

建议在https://codepen.io/pen上执行查看，挂载https://cdn.bootcss.com/babel-polyfill/7.0.0-alpha.12/polyfill.js

若您嫌麻烦，直接点这里: https://codepen.io/timrchen/pen/NggaEj