node.js使用readline按行读取文件内容到Array中-蒲公英云

node.js使用readline按行读取文件内容到Array中

具体代码实现如下：

var fs = require("fs");
var readLine = require("readline");
/** * 按行读取文件内容 * * @param fReadName 文件名路径 * @param cb 回调函数 * * @return 字符串数组 */
function readFileToArr(fReadName, cb) { 
    var arr = [];
    var readObj = readLine.createInterface({ 
        input: fs.createReadStream(fReadName)
    });
    readObj.on('line', function (line) { 
        arr.push(line);
    });
    readObj.on('close', function () { 
        console.log('readLine close....');
        cb(arr);
    });
}
readFileToArr('ObserverMode.js', function (arr) { 
    console.log(arr);
});

使用到的实例代码如下：

//ObserverMode.js
const queuedObservers = new Set();
const observe = fn => queuedObservers.add(fn);
const observable = obj => new Proxy(obj, { set});
function set(target, key, value, receiver) { 
    const result = Reflect.set(target, key, value, receiver);
    queuedObservers.forEach(observer => observer());
    return result;
}
const person = observable({ 
    name: '张三',
    age: 20
});
function print() { 
    console.log(`${ person.name}, ${ person.age}`)
}
observe(print);
person.name = '李四';

示例执行结果如下：

"D:\software\WebStorm 2017.2.4\bin\runnerw.exe" "D:\Program Files\nodejs\node.exe" D:\Workspaces\Webstorm\web\javascript\ES6\src\readFileToArr.js
readLine close....
[ '',
  'const queuedObservers = new Set();',
  '',
  'const observe = fn => queuedObservers.add(fn);',
  'const observable = obj => new Proxy(obj, {set});',
  '',
  'function set(target, key, value, receiver) {',
  ' const result = Reflect.set(target, key, value, receiver);',
  ' queuedObservers.forEach(observer => observer());',
  ' return result;',
  '}',
  '',
  'const person = observable({',
  ' name: \'张三\',',
  ' age: 20',
  '});',
  '',
  'function print() {',
  ' console.log(`${person.name}, ${person.age}`)',
  '}',
  '',
  'observe(print);',
  'person.name = \'李四\';',
  '' ]
Process finished with exit code 0