function hex2int(hex) {
    var len = hex.length, a = new Array(len), code;
    for (var i = 0; i < len; i++) {
        code = hex.charCodeAt(i);
        if (48<=code && code < 58) {
            code -= 48;
        } else {
            code = (code & 0xdf) - 65 + 10;
        }
        a[i] = code;
    }
    
    return a.reduce(function(acc, c) {
        acc = 16 * acc + c;
        return acc;
    }, 0);
}

function int2hex(num, width) {
  var hex = "0123456789abcdef";
  var s = "";
  while (num) {
	s = hex.charAt(num % 16) + s;
	num = Math.floor(num / 16);
  }
  if (typeof width === "undefined" || width <= s.length) {
	return "0x" + s;
  }
  var delta = width - s.length;
  var padding = "";
  while(delta-- > 0) {
	padding += "0";
  }
  return "0x" + padding + s;
}

var charData = '1';
charData.charCodeAt();    //輸出結(jié)果為上表中‘1'對(duì)應(yīng)的十進(jìn)制數(shù)據(jù)：49
charData.charCodeAt().toString(16);  //輸出結(jié)果為上表中‘1'對(duì)應(yīng)的十六進(jìn)制數(shù)據(jù)：31

var num = 49;
String.fromCharCode(num);  //輸出49對(duì)應(yīng)的字符 '1'

var a='11160'; 
alert(parseInt(a,2)); //將111做為2進(jìn)制來(lái)轉(zhuǎn)換,忽略60(不符合二進(jìn)制),從左至右只將符合二進(jìn)制數(shù)的進(jìn)行轉(zhuǎn)換 
alert(parseInt(a,16)); //將所有的都進(jìn)行轉(zhuǎn)換 
依照此方法,其實(shí)可以轉(zhuǎn)換成任何進(jìn)制 
var a='1110'; 
alert(parseInt(a,10).toString(16)); //將A轉(zhuǎn)換為10進(jìn)制,然后再轉(zhuǎn)換成16進(jìn)制 同樣也可以是其它進(jìn)制 
下面說(shuō)下ASCII 碼: 
function test(){ 
var a='ab'; 
var c=a.charCodeAt(1);//返回98 也就是b的AscII碼 位置從0開(kāi)始 
 
var char=String.fromCharCode(98);返回小寫的b 
} 
//小例子 
function test(){ //輸出AscII碼擴(kuò)展集中的字符 
var c=""; 
for(var i=1;i<65536;i++){ 
if((i%10)==0){ 
c+=i+':\t'+String.fromCharCode(i)+'\t'+'\n';}else{ 
c+=i+':\t'+String.fromCharCode(i)+'\t';} 
} 
document.getElementById("abc").innerText=c; 
} 
<div id='abc'></div>