Question

我已经得到了这段代码：

＆＃13;

af = async () => {
    Promise.resolve()
    .then(x => console.log("first then"))
    .then(x => console.log("second then"))
    await Promise.resolve()
    console.log("after await")
}

af()

＆＃13;

在谷歌浏览器版本61.0.3163.91（官方版本）（64位）当我从<script>运行它时，我得到了以下结果：

first then 
after await
second then

但是当我将代码复制/粘贴到控制台并运行它时，我得到了：

first then
second then
after await

node.js 8.5.0表现相似。

什么是正确的顺序以及为什么会有差异？

//编辑

另一个有趣的事情是firefox 55.0.2（64位）对于此代码：

＆＃13;

af = async () => {
    Promise.resolve()
    .then(x => console.log("first then"))
    .then(x => console.log("second then"))
    .then(x => console.log("third then"))
    .then(x => console.log("forth then"))
    await Promise.resolve()
    console.log("after await")
}

af()

＆＃13;

日志：

first then
second then
third then
after await
forth then

Answer 1

执行此操作的正确方法是在import numpy as np class CLUMPY: def __init__(self, k, file): # input file self.__file = file print("k=",k) print("Reading {}...".format(file)) # data points self.__points = np.loadtxt(file) # number of data points self.__n = self.__points.shape[0] # data points dimensionality (or length according to numpy terminology) self.__d = self.__points.shape[1] print("Read {}: {} points in {} dimensions.".format(file, self.__n, self.__d)) # __class[i] = j : the i-th data point is assigned to the j-th cluster self.__class = np.zeros(self.__n, dtype=np.int8) if __name__ == "__main__": clumpy = CLUMPY(2, "datasets/202d")之前添加await，然后执行＆＃34;首先是＆＃34;然后＆＃34;然后＆＃34;然后＆＃34;控制台日志。这样它等待承诺完成之后才能进入控制台日志，等待＃34;

这就是您的意图。

＆＃13;

Promise.resolve()

＆＃13;

承诺解决订单并等待

1 个答案: