问题描述
我试图写入node.js中的文本文件。
我这样做的方式如下:
Im trying to write into a text file in node.js.Im doing this the following way:
fs.writeFile("persistence\\announce.txt", string, function (err) {
if (err) {
return console.log("Error writing file: " + err);
}
});
而string是一个变量。
whereas string is a variable.
此函数将始终在文件的开头写入,因此它将覆盖以前的内容。
This function will begin it`s writing always at the beginning of a file, so it will overwrite previous content.
我在下列情况下遇到问题:
I have a problem in the following case:
旧内容:
Hello Stackoverflow
new write:
new write:
Hi Stackoverflow
现在,以下内容将出现在文件中:
Now the following content will be in the file:
Hi stackoverflowlow
新写入比之前的内容短,因此部分旧内容仍然存在。
The new write was shorter then the previous content, so part of the old content is still persistent.
我的问题:
我需要做什么,以便在以前完全删除文件的旧内容新写入?
What do I need to do, so that the old content of a file will be completely removed before the new write is made?
推荐答案
您可以先尝试截断文件:
You can try truncating the file first:
fs.truncate("persistence\\announce.txt", 0, function() {
fs.writeFile("persistence\\announce.txt", string, function (err) {
if (err) {
return console.log("Error writing file: " + err);
}
});
});
这篇关于在Node.js中覆盖文件的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!