fs.writeFileSync()方法用於將數據同步寫入文件。如果該文件已經存在，則替換該文件。 “ options”參數可用於修改方法的函數。
用法:
fs.writeFileSync( file, data, options )
參數：此方法接受上述和以下所述的三個參數：
- file:它是一個字符串，Buffer，URL或文件描述整數，表示必須在其中寫入文件的路徑。使用文件描述符將使其行為類似於fs.write()方法。
- data:它是將寫入文件的字符串，Buffer，TypedArray或DataView。
- options:它是一個字符串或對象，可用於指定將影響輸出的可選參數。它具有三個可選參數：
- encoding:它是一個字符串，它指定文件的編碼。默認值為“ utf8”。
- mode:它是一個整數，指定文件模式。默認值為0o666。
- flag:它是一個字符串，指定在寫入文件時使用的標誌。默認值為“ w”。
以下示例說明了Node.js中的fs.writeFileSync()方法：
範例1：
// Node.js program to demonstrate the
// fs.writeFileSync() method
// Import the filesystem module
const fs = require('fs');
let data = "This is a file containing a collection"
+ " of programming languages.\n"
+ "1. C\n2. C++\n3. Python";
fs.writeFileSync("programming.txt", data);
console.log("File written successfully\n");
console.log("The written has the following contents:");
console.log(fs.readFileSync("programming.txt", "utf8"));輸出：
File written successfully The written has the following contents: This is a file containing a collection of programming languages. 1. C 2. C++ 3. Python
範例2：
// Node.js program to demonstrate the
// fs.writeFileSync() method
// Import the filesystem module
const fs = require('fs');
// Writing to the file 5 times
// with the append file mode
for (let i = 0; i < 5; i++) {
fs.writeFileSync("movies.txt",
"Movie " + i + "\n",
{
encoding:"utf8",
flag:"a+",
mode:0o666
});
}
console.log("File written successfully 5 times\n");
console.log("The written file has the following contents:");
console.log(fs.readFileSync("movies.txt", "utf8"));輸出：
File written successfully 5 times The written file has the following contents: Movie 0 Movie 1 Movie 2 Movie 3 Movie 4
參考： https://nodejs.org/api/fs.html#fs_fs_writefilesync_file_data_options
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