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javascript - About how to write promise

PHPz 2017-05-19 10:31:14

563

I’m not very familiar with how to writePromise. I hope I can encapsulate some common states ofrejectandresolve. How can I write it better?
And the followingwriteFileIs it better to write it directly as a normal function? Sorry for posting the long code, please help. . . . Thanks

PHPz

学习是最好的投资！

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黄舟2017-05-19 10:33:14 1 floor

Asynchronous operations are best to requirepromise或者Generator函数或者是asyncfunctions

var readFile = function (fileName) { return new Promise(function (resolve, reject) { fs.readFile(fileName, function(error, data) { if (error) reject(error); resolve(data); }); }); };

Jiang Zi is simpler! Then put all the data processing logic inside the callingthen或者catch