Calculation/app/public/js/fsUtil.js

/**
 * Created by Tony on 2017/4/10.
 */

let fs = require('fs');

module.exports = {
    writeArrayToFile: function(arr, filePath) {
        if (arr && filePath && Array.isArray(arr)) {
            let chunks = [], len = 0;
            for (let i = 0; i < arr.length; i++) {
                let buffer = new Buffer(arr[i]);
                chunks.push(buffer);
                len += buffer.length;
                //
            }
            let resultBuffer = new Buffer(len);
            for(let i=0,size=chunks.length,pos=0;i<size;i++){
                chunks[i].copy(resultBuffer,pos);
                pos += chunks[i].length;
            }
            fs.writeFile(filePath, resultBuffer, function(err){
                if(err) throw err;
                //console.log('Write file: ' + filePath + ' ok!');
            });
        }
    },
    writeObjToFile: function(obj, filePath) {
        if (obj) {
            let arr = [];
            arr.push(JSON.stringify(obj));
            this.writeArrayToFile(arr, filePath);
        }
    }
};