Javascript 如何在 Node.js 中同步读取文件内容？
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How to read the content of files synchronously in Node.js?
提问by alexchenco
This is what I have:
这就是我所拥有的：
#! /usr/bin/env node
var fs = require('fs'),
files = fs.readdirSync(__dirname + '/files/'),
files.forEach(function(file) {
fs.readFile(__dirname + '/files/' + file, 'utf8', function (error, data) {
console.log(data)
})
})
Even though I'm using readdirSyncthe output is still asynchronous:
即使我使用readdirSync的输出仍然是异步的：
alex@alex-K43U:~/node/readFiles$ node index.js
foo 1
foo 3
foo 2
How to modify the code so the output becomes synchronous?
如何修改代码使输出同步？
alex@alex-K43U:~/node/readFiles$ node index.js
foo 1
foo 2
foo 3
回答by Gazler
You need to use readFileSync, your method is still reading the files asynchronously, which can result in printing the contents out of order depending on when the callback happens for each read.
您需要使用readFileSync，您的方法仍在异步读取文件，这可能会导致内容乱序打印，具体取决于每次读取的回调发生时间。
var fs = require('fs'),
files = fs.readdirSync(__dirname + '/files/');
files.forEach(function(file) {
var contents = fs.readFileSync(__dirname + '/files/' + file, 'utf8');
console.log(contents);
})
回答by Peter Paul Kiefer
That's because you read the file asynchronously. Try:
那是因为您异步读取文件。尝试：
#! /usr/bin/env node
var fs = require('fs'),
files = fs.readdirSync(__dirname + '/files/'),
files.forEach(function(file) {
var data = fs.readFileSync(__dirname + '/files/' + file, 'utf8');
console.log(data);
});
回答by Daniel A. White
Have you seen readFileSync? I think that could be your new friend.
你见过readFileSync吗？我想那可能是你的新朋友。
