node讀取文件中的中文

1、讀取文件內容

var fs = require('fs');
// fs.readFile('./a.txt',function(err,data){utf8輸出文本
    fs.readFile('./a.txt','utf8',function(err,data){  
    if(err){
        console.log(err);
        return;
    }
    console.log(data);
})

2、按行讀取文件中的中文，需正則匹配

var fs = require('fs');
var readline = require('readline');
let reg = /[\u4e00-\u9fa5]/g;
function readFileToArr(fReadName,callback){
    var fRead = fs.createReadStream(fReadName);
    var objReadline = readline.createInterface({
        input:fRead
    });
    var arr = new Array();
    objReadline.on('line',function (line) {
        if(line.match(reg)){
            arr.push(line.match(reg));
        }
      
        // console.log('line:'+ line);
    });
    objReadline.on('close',function () {
    //    console.log('close',arr);
        callback(arr);
    });
}

readFileToArr('./canvas.html',function(data){
    data.forEach((item,index)=>{
        console.log(index,item.join(''));
        
    })
        // console.log(data);
    });