本文實例講述了node Buffer緩存區常見操作。分享給大家供大家參考，具體如下：

創建buffer類

var buf=new buffer(10);var buf=new buffer([10,20,30,40]);var buf=new buffer("www.baidu.com","utf-8");

寫入緩存區

buf.write(string[,offset[,length]][encoding])buf=new buffer(256);len=buf.write("www.baidu.com")console,log("寫入字節數："+len)

從緩存讀取數據

buf.toString([encoding[,start[,end]]])buf=new buffer(26);for(var i=0;i<26;i++;){buf[i]=i+97;}console.log(buf.toString('ascill'));console.log(buf.toString('ascill',0,5))console.log(buf.toString('utf-8',0,5))console.log(buf.toString('undefined',0,5))

轉為json

buf.toJSON()var buf=new buffer('www.baidu.com');var json=buf.toJSON('buf')console.log(json)

緩存合并

buffer.concat(list[,totalLength]);var buffer1=new Buffer('百度搜索');var buffer2=new Buffer('www.baidu.com');var buffer3=Buffer.concat([buffer1,buffer2]);console.log("buffer3內容"+buffer3.toString())

緩存區比較

buf.compare(otherBuffer)var buffer1=new Buffer('ABC');var buffer2=new Buffer('ABCD');var result=buffer1.compare(buffer2);if(result<0){console.log(buffer1+"在"+buffer2+"之前")}else if(result==0){console.log(buffer1+"等于"+buffer)}else{console.log(buffer1+"在"+buffer2+"之后")}

拷貝緩存區

buf.copy(targetBuffer[,targetStart[,sourceStart[,sourcEnd]]])var buffer1=new Buffer('ABC');var buffer2=new Buffer(3);buffer1.copy(Buffer2);console.log("buffer2 content:"+buffer2.toString())

緩存區裁剪

buf.slice([start[,end]])var buffer1=new Buffer('baidu')var buffer2=buffer1.slice(0,2);console.log("buffer2 content:"+buffer2.toString());buffer2 content:ba

緩存區長度

buf.lengthvar buffer=new Buffer("www.baidu.com");console.log("buffer length:"+buffer.length)buffer length:13

希望本文所述對大家node.js程序設計有所幫助。