demo1
function request(num) { // 模拟接口请求
return new Promise(resolve => {
setTimeout(() => {
resolve(num * 2)
}, 1000)
})
}
request(1).then(res1 => {
console.log(res1) // 1秒后 输出 2
request(2).then(res2 => {
console.log(res2) // 2秒后 输出 4
})
})
demo2
具体链接:https://mp.weixin.qq.com/s/hOx7QqlrLy51XHu9pHongQ
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