在两个导出函数之间使用变量

Question

I am getting errors while using variable among two exported Node.js function

Variable name is buffer which is a Buffer.

Am i right in using variable buffer in js code ?

module.exports = {

    var buffer ;

    init: function(data) 
    {
        buffer = data ;
    },
    test: function(word) 
    {

        var readline = require('readline');
        var stream = require('stream');

        // string to buffer
        var baseText = buffer;
        var buf = new Buffer(baseText);

        //buffer to stream
        var bufferStream = new stream.PassThrough();
        bufferStream.end(buf);

        var readLines = readline.createInterface({
            input: bufferStream,
        });

        var count = 0;
        readLines.on('line', function (line)
            {
                if(line.toLowerCase().indexOf(word.toLowerCase()) != -1)
                return true;

            }
        );

        return false;
    }
}

Answer 1

{...} is an object literal. It can only contain property declarations ( name: value ).

var is a statement; you can't put it in the middle of an object literal.

You need to declare the variable separately.

Answer 2

You can't declare variables in Object literals. If you define outside module.exports , then there won't any error.

var buffer ;

function init(data) {
   buffer = data ;
}

function test(word) {
    var readline = require('readline');
    var stream = require('stream');

    // string to buffer
    var baseText = buffer;
    var buf = new Buffer(baseText);

    //buffer to stream
    var bufferStream = new stream.PassThrough();
    bufferStream.end(buf);

    var readLines = readline.createInterface({
        input: bufferStream,
    });

    var count = 0;
    readLines.on('line', function (line) {
            if(line.toLowerCase().indexOf(word.toLowerCase()) != -1)
               return true;
    });
    return false;
}

module.exports = {
    init: init,
    test: test
}

Answer 3

You can't declare a variable inside an object literal.

Try something like this:

var buffer;

module.exports = {

    init: function(data) {}
    // the rest of your code

}

This is similar to the revealing module pattern .