node中的readline模块

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1.一行行读取并写入

var readline = require('readline');
var fs = require('fs');
var file = fs.createReadStream('message.txt');

var out = fs.createWriteStream('anotherMesage.txt');

var index= 1;

out.write('line: '+index.toString()+':');

var r1 = readline.createInterface({
input: file,
output: out,
terminal: true
});
r1.on('line',function(line){
out.write('line: '+index.toString()+':');
index++;
})

2.提示符操作：

var readline = require('readline');
function completer (line){
var completions = 'help error quit aaa bbb ccc'.split(' ');
var hits = completions.filter(function(c){return c.indexOf(line) == 0});
return[hits,line];

}

var r1 = readline.createInterface({
input:process.stdin,
output:process.stdout,
completer:completer
});

r1.on('line',function(line){
if (line == 'exit' || line == 'quit' || line == 'q') {
r1.close()
} else{
console.log('输入了： '+line)
};
})

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