进制转换（二）（Javascript版）

下面是偶在JavaScript中实现的各种进制间的转换。

//dh20156

//2006-9-10

//返回指定数量的重复字符组成的字符串;

function dhString(n,c){

var tempStr = "";

for(var i=0;i<n;i++){

tempStr += c.toString();

}

return tempStr;

}

document.write("二进制、十进制转换<hr>");

//二进制 --> 十进制

function tw2teChange(n){

var strN = n.toString();

var ln = strN.length;

var tempInt = 0;

for(var i=0;i<ln;i++){

var t = strN.substr(i,1);

var e = ln-i-1;

if(!isNaN(t)){

tempInt += t*(Math.pow(2,e));

}else{

tempInt += "?";

}

return tempInt;

}

function tw2te(n){

var strN = n.toString();

var tempInt = 0;

var ln = strN.length;

var ld = strN.indexOf(".")

if(ld<0){

tempInt = tw2teChange(strN);

}else{

var ti = strN.substring(0,ld);

var tm = strN.substring(ld+1,ln);

var tempInt1 = tw2teChange(ti);

var tempInt2 = tw2teChange(tm);

tempInt = tempInt1+"."+tempInt2;

}

return tempInt;

}

//------ 结束 -----

var a = "10110111.101100";

document.write(a+" --2T10--> "+tw2te(a)+" ");

//十进制 --> 二进制

function te2twChange(n){

if(!isNaN(n) && n>0){

if(n%2==0){

return te2twChange(n/2)+"0";

}else{

if(n>2){

return te2twChange(parseInt(n/2))+(n%2);

}else{

return te2twChange(0)+n;

}

}else{

return "";

}

function te2tw(n){

if(!isNaN(n)){

var strN = n.toString();

var tempInt = 0;

var ln = strN.length;

var ld = strN.indexOf(".")

if(ld<0){

tempInt = te2twChange(n);

}else{

var ti = strN.substring(0,ld);

var tm = strN.substring(ld+1,ln);

var tempInt1 = te2twChange(ti);

var tempInt2 = te2twChange(tm);

tempInt = tempInt1+"."+tempInt2;

}

return tempInt;

}else{

return "false";

}

//------ 结束 -----

var b = 101;

document.write(b+" --10T2--> "+te2tw(b)+" ");

document.write(" 二进制、八进制转换<hr>");

//二进制 --> 八进制

function tw2eiChange(n,tp){

var strN = n.toString();

var ln = strN.length;

var tempInt = "";

if(tp=="intType"){

for(var i=ln;i>0;i -= 3){

var tempN = strN.substring(i-3,i);

tempInt = tw2te(tempN)+tempInt;

}

}else{

for(var i=0;i<ln;i += 3){

var tempN = strN.substring(i,i+3);

if(tempN.length<3){

tempN = tempN+dhString((3-tempN.length),"0");

}

tempInt += tw2te(tempN);

}

return tempInt;

}

function tw2ei(n){

var strN = n.toString();

var tempInt = 0;

var ln = strN.length;

var ld = strN.indexOf(".")

if(ld<0){

tempInt = tw2eiChange(strN,"intType");

}else{

var ti = strN.substring(0,ld);

var tm = strN.substring(ld+1,ln);

var tempInt1 = tw2eiChange(ti,"intType");

var tempInt2 = tw2eiChange(tm,"modType");

tempInt = tempInt1+"."+tempInt2;

}

return tempInt;

}

//------ 结束 -----

var c = "10110111.1011";

document.write(c+" --2T8--> "+tw2ei(c)+" ");

//八进制 --> 二进制

function ei2twChange(n){

var strN = n.toString();

var ln = strN.length;

var tempInt = "";

for(var i=0;i<ln;i++){

var t = strN.substr(i,1);

var e = ln-i-1;

if(!isNaN(t)){

tempInt += te2tw(t);

}else{

tempInt += "?";

}

return tempInt;

}

function ei2tw(n){

if(!isNaN(n)){

var strN = n.toString();

var tempInt = 0;

var ln = strN.length;

var ld = strN.indexOf(".")

if(ld<0){

tempInt = ei2twChange(n);

}else{

var ti = strN.substring(0,ld);

var tm = strN.substring(ld+1,ln);

var tempInt1 = ei2twChange(ti);

var tempInt2 = ei2twChange(tm);

tempInt = tempInt1+"."+tempInt2;

}

return tempInt;

}else{

return "false";

}

//------ 结束 -----

var d = 267.54;

document.write(d+" --8T2--> "+ei2tw(d)+" ");

document.write(" 二进制、十六进制转换<hr>");

//二进制 <-匹配表-> 十六进制

function twMatchst(v,rv){

if(rv==16){

switch(v.toString()){

case "0000":return "0";break;

case "0001":return "1";break;

case "0010":return "2";break;

case "0011":return "3";break;

case "0100":return "4";break;

case "0101":return "5";break;

case "0110":return "6";break;

case "0111":return "7";break;

case "1000":return "8";break;

case "1001":return "9";break;

case "1010":return "A";break;

case "1011":return "B";break;

case "1100":return "C";break;

case "1101":return "D";break;

case "1110":return "E";break;

case "1111":return "F";break;

default:return "";break;

}

}else{

switch(v.toString()){

case "0":return "0000";break;

case "1":return "0001";break;

case "2":return "0010";break;

case "3":return "0011";break;

case "4":return "0100";break;

case "5":return "0101";break;

case "6":return "0110";break;

case "7":return "0111";break;

case "8":return "1000";break;

case "9":return "1001";break;

case "A":return "1010";break;

case "B":return "1101";break;

case "C":return "1100";break;

case "D":return "1101";break;

case "E":return "1110";break;

case "F":return "1111";break;

default:return "";break;

}

//------ 结束 ------

//二进制 --> 十六进制

function tw2stChange(n,tp){

var strN = n.toString();

var ln = strN.length;

var tempInt = "";

if(tp=="intType"){

for(var i=ln;i>0;i -= 4){

var tempN = strN.substring(i-4,i);

if(tempN.length<4){

tempN = dhString((4-tempN.length),"0")+tempN;

}

tempInt = twMatchst(tempN,16)+tempInt;

}

}else{

for(var i=0;i<ln;i += 4){

var tempN = strN.substring(i,i+4);

if(tempN.length<4){

tempN = tempN+dhString((4-tempN.length),"0");

}

tempInt += twMatchst(tempN,16);

}

return tempInt;

}

function tw2st(n){

var strN = n.toString();

var tempInt = 0;

var ln = strN.length;

var ld = strN.indexOf(".")

if(ld<0){

tempInt = tw2stChange(strN,"intType");

}else{

var ti = strN.substring(0,ld);

var tm = strN.substring(ld+1,ln);

var tempInt1 = tw2stChange(ti,"intType");

var tempInt2 = tw2stChange(tm,"modType");

tempInt = tempInt1+"."+tempInt2;

}

return tempInt;

}

//------ 结束 ------

var e = "110110111.101001";

document.write(e+" --2T16--> "+tw2st(e)+" ");

//十六进制 --> 二进制

function st2twChange(n){

var strN = n.toString();

var ln = strN.length;

var tempInt = "";

for(var i=0;i<ln;i++){

var t = strN.substr(i,1);

var e = ln-i-1;

tempInt += twMatchst(t,2);

}

return tempInt;

}

function st2tw(n){

var strN = n.toString();

var tempInt = 0;

var ln = strN.length;

var ld = strN.indexOf(".")

if(ld<0){

tempInt = st2twChange(strN);

}else{

var ti = strN.substring(0,ld);

var tm = strN.substring(ld+1,ln);

var tempInt1 = st2twChange(ti);

var tempInt2 = st2twChange(tm);

tempInt = tempInt1+"."+tempInt2;

}

return tempInt;

}

//------ 结束 ------

var f = "1B7.A4";

document.write(f+" --16T2--> "+st2tw(f)+" ");

document.write(" 八进制、十进制转换<hr>");

//八进制 --> 十进制

function ei2teChange(n){

var strN = n.toString();

var ln = strN.length;

var tempInt = 0;

for(var i=0;i<ln;i++){

var t = strN.substr(i,1);

var e = ln-i-1;

if(!isNaN(t)){

tempInt += t*(Math.pow(8,e));

}else{

tempInt += "?";

}

return tempInt;

}

function ei2te(n){

var strN = n.toString();

var tempInt = 0;

var ln = strN.length;

var ld = strN.indexOf(".")

if(ld<0){

tempInt = ei2teChange(strN);

}else{

var ti = strN.substring(0,ld);

var tm = strN.substring(ld+1,ln);

var tempInt1 = ei2teChange(ti);

var tempInt2 = ei2teChange(tm);

tempInt = tempInt1+"."+tempInt2;

}

return tempInt;

}

//------ 结束 -----

var g = "267.54";

document.write(g+" --8T10--> "+ei2te(g)+" ");

//十进制 --> 八进制

function te2eiChange(n){

if(!isNaN(n) && n>0){

if(n%8==0){

return te2eiChange(n/8)+"0";

}else{

if(n>8){

return te2eiChange(parseInt(n/8))+(n%8);

}else{

return te2eiChange(0)+n;

}

}else{

return "";

}

function te2ei(n){

if(!isNaN(n)){

var strN = n.toString();

var tempInt = 0;

var ln = strN.length;

var ld = strN.indexOf(".")

if(ld<0){

tempInt = te2eiChange(n);

}else{

var ti = strN.substring(0,ld);

var tm = strN.substring(ld+1,ln);

var tempInt1 = te2eiChange(ti);

var tempInt2 = te2eiChange(tm);

tempInt = tempInt1+"."+tempInt2;

}

return tempInt;

}else{

return "false";

}

//------ 结束 -----

var h = 183.44;

document.write(h+" --10T8--> "+te2ei(h)+" ");

document.write(" 十六进制、十进制转换<hr>");

//十进制 <-匹配表-> 十六进制

function teMatchst(v,rv){

if(rv==16){

switch(v.toString()){

case "0":return "0";break;

case "1":return "1";break;

case "2":return "2";break;

case "3":return "3";break;

case "4":return "4";break;

case "5":return "5";break;

case "6":return "6";break;

case "7":return "7";break;

case "8":return "8";break;

case "9":return "9";break;

case "10":return "A";break;

case "11":return "B";break;

case "12":return "C";break;

case "13":return "D";break;

case "14":return "E";break;

case "15":return "F";break;

default:return "";break;

}

}else{

switch(v.toString()){

case "0":return "0";break;

case "1":return "1";break;

case "2":return "2";break;

case "3":return "3";break;

case "4":return "4";break;

case "5":return "5";break;

case "6":return "6";break;

case "7":return "7";break;

case "8":return "8";break;

case "9":return "9";break;

case "A":return "10";break;

case "B":return "11";break;

case "C":return "12";break;

case "D":return "13";break;

case "E":return "14";break;

case "F":return "15";break;

default:return "";break;

}

//------ 结束 ------

//十六进制 --> 十进制

function st2teChange(n){

var strN = n.toString();

var ln = strN.length;

var tempInt = 0;

for(var i=0;i<ln;i++){

var t = strN.substr(i,1);

t = teMatchst(t,10)

var e = ln-i-1;

if(!isNaN(t)){

tempInt += t*(Math.pow(16,e));

}else{

tempInt += "?";

}

return tempInt;

}

function st2te(n){

var strN = n.toString();

var tempInt = 0;

var ln = strN.length;

var ld = strN.indexOf(".")

if(ld<0){

tempInt = st2teChange(strN);

}else{

var ti = strN.substring(0,ld);

var tm = strN.substring(ld+1,ln);

var tempInt1 = st2teChange(ti);

var tempInt2 = st2teChange(tm);

tempInt = tempInt1+"."+tempInt2;

}

return tempInt;

}

//------ 结束 -----

var i = "A4B7";

document.write(i+" --16T10--> "+st2te(i)+" ");

//十进制 --> 十六进制

function te2stChange(n){

if(!isNaN(n) && n>0){

if(n%16==0){

return te2stChange(n/16)+"0";

}else{

if(n>16){

return te2stChange(parseInt(n/16))+teMatchst((n%16),16);

}else{

return te2stChange(0)+teMatchst(n,16);

}

}else{

return "";

}

function te2st(n){

if(!isNaN(n)){

var strN = n.toString();

var tempInt = 0;

var ln = strN.length;

var ld = strN.indexOf(".")

if(ld<0){

tempInt = te2stChange(n);

}else{

var ti = strN.substring(0,ld);

var tm = strN.substring(ld+1,ln);

var tempInt1 = te2stChange(ti);

var tempInt2 = te2stChange(tm);

tempInt = tempInt1+"."+tempInt2;

}

return tempInt;

}else{

return "false";

}

//------ 结束 -----

var j = 120;

document.write(j+" --10T16--> "+te2st(j)+" ");

</script>

效果请参见：

http://www.v-ec.com/dhChange/dhChange.htm