node（Buffer缓存区）

时间：2024-04-06 20:05:37
// 创建buffer类

var buf=new buffer(10);

var buf=new buffer([10,20,30,40]);

var buf=new buffer("www.baidu.com","utf-8");

// 写入缓存区

buf.write(string[,offset[,length]][encoding])

buf=new buffer(256);

len=buf.write("www.runoob.com")

console,log("写入字节数："+len)

// 从缓存读取数据

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))

// 转为json

buf.toJSON()

var buf=new buffer('www.baidu.com');

var json=buf.toJSON('buf')

console.log(json)

// 缓存合并

buffer.concat(list[,totalLength]);

var buffer1=new Buffer('菜鸟教程');

var buffer2=new Buffer('www.runoob.com');

var buffer3=Buffer.concat([buffer1,buffer2]);

console.log("buffer3内容"+buffer3.toString())

// 缓存区比较

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")

}

// 拷贝缓存区

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())

// 缓存区裁剪

buf.slice([start[,end]])

var buffer1=new Buffer('runoob')

var buffer2=buffer1.slice(0,2);

console.log("buffer2 content:"+buffer2.toString());

buffer2 content:ru

// 缓存区长度

buf.length

var buffer=new Buffer("www.runoob.com");

console.log("buffer length:"+buffer.length)

buffer length:14

 

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